Acaena exigua NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports -- ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.

FWS Digital Media Library -- The U.S.<a href="https://www.earth.com/news/ocean-surface-slicks-create-superhighway-for-fish/"> Fish</a> and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video. Acaena exigua is an extinct species of flowering plant in the rose family known by the common name liliwai. It was endemic to Hawaii, where it was known from Kauaʻi and west Maui. It had not been seen or collected since 1957 and was feared extinct until 1997, when one plant was discovered in a remote montane bog on <a href="https://www.bing.com/search?q=maui&amp;cvid=11f593b142284a109c4b71b63cd85874&amp;FORM=ANAB01&amp;PC=HCTS">Maui</a>. The plant died in 2000, and the species is now considered extinct.Acaena exigua A. Gray var. subtusstrigulosa Bitter: Classification. Click on a scientific name below to expand it in the PLANTS Classification Report. Rank Scientific Name and Common Name; Kingdom: Plantae – Plants Subkingdom: Tracheobionta

Acaena exigua

Acaena exigua NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation...

Berberis pinnata ssp. insularis NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports -- ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants,<a href="https://www.earth.com/news/changing-ocean-soundscapes-impact-animals-worldwide/"> animals</a>, fungi, and microbes of North America and the world.

FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.Berberis (<a title="Help:IPA/English" href="https://en.wikipedia.org/wiki/Help:IPA/English">/ˈbɜːrbərɪs/</a>), commonly known as barberry, is a large <a title="Genus" href="https://en.wikipedia.org/wiki/Genus">genus</a> of <a title="Deciduous" href="https://en.wikipedia.org/wiki/Deciduous">deciduous</a> and <a title="Evergreen" href="https://en.wikipedia.org/wiki/Evergreen">evergreen</a> <a title="Shrub" href="https://en.wikipedia.org/wiki/Shrub">shrubs</a> from 1–5 m (3.3–16.4 ft) tall, found throughout <a class="mw-redirect" title="Temperateness" href="https://en.wikipedia.org/wiki/Temperateness">temperate</a> and <a class="mw-redirect" title="Subtropical" href="https://en.wikipedia.org/wiki/Subtropical">subtropical</a> regions of the world (apart from Australia). Species diversity is greatest in South America and Asia; Europe, Africa and North America have native species as well. The best-known Berberis species is the European barberry, <a title="Berberis vulgaris" href="https://en.wikipedia.org/wiki/Berberis_vulgaris">Berberis vulgaris</a>, which is common in Europe, North Africa, the Middle East, and central Asia, and has been widely introduced in North America. Many of the species have <a class="mw-redirect" title="Spine (botany)" href="https://en.wikipedia.org/wiki/Spine_(botany)">spines</a> on the shoots and all along the margins of the leaves

Berberis pinnata ssp. insularis

Berberis pinnata ssp. insularis NatureServe Explorer Species Reports -- NatureServe...

Betula uber NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports -- Betula uber ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.

The tree was first described in 1914 as a variety of <a title="Betula lenta" href="https://en.wikipedia.org/wiki/Betula_lenta">Betula lenta</a>, and elevated to species status in 1945. It <a title="Hybrid (biology)" href="https://en.wikipedia.org/wiki/Hybrid_(biology)">hybridizes</a> with B. lenta and it has been suggested that it is actually a round-leaved mutant form of B. lenta.Some authorities prefer to treat it as a variety.

After it was first discovered in 1914, the tree was not seen again and was thought to be <a title="Extinction" href="https://en.wikipedia.org/wiki/Extinction">extinct</a> until 1975, when some individuals were found. These 18 adult trees and 23 <a class="mw-redirect" title="Sapling" href="https://en.wikipedia.org/wiki/Sapling">saplings</a> and <a title="Seedling" href="https://en.wikipedia.org/wiki/Seedling">seedlings</a> were in a forest along the degraded banks of Cressy Creek on Smyth County, Virginia. The tree was federally listed as an <a title="Endangered species" href="https://en.wikipedia.org/wiki/Endangered_species">endangered species</a> and <a title="Habitat conservation" href="https://en.wikipedia.org/wiki/Habitat_conservation">conservation</a> efforts were begun. Many seedlings were sprouted in <a title="Greenhouse" href="https://en.wikipedia.org/wiki/Greenhouse">greenhouses</a> and planted in the forest. By 1995 there were 20 populations and it was downlisted to threatened status. The tree was propagated in order to discourage collectors from taking wild specimens, or <a title="Vandalism" href="https://en.wikipedia.org/wiki/Vandalism">vandals</a> from destroying them.A recent count estimated 961 individuals in the wild as of 2006.Eight of these are in the original creekside population. The species will not be removed from the <a class="mw-redirect" title="Endangered Species Act" href="https://en.wikipedia.org/wiki/Endangered_Species_Act">endangered species</a> list yet because it has not been observed <a title="Sexual reproduction" href="https://en.wikipedia.org/wiki/Sexual_reproduction">reproducing sexually</a>, and naturally, more than once. The expansion of its range is limited because the area is surrounded by <a title="Agriculture" href="https://en.wikipedia.org/wiki/Agriculture">agricultural land</a>, but the territory on which the tree occurs is not immediately threatened

FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.

Betula uber

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Bidens amplectens NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports -- Bidens amplectens ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.Bidens amplectens, the Waiʻanae kokoʻolau, is a <a title="Species" href="https://en.wikipedia.org/wiki/Species">species</a> of flowering plant in the <a title="Family (biology)" href="https://en.wikipedia.org/wiki/Family_(biology)">family</a> Asteraceae. It belongs to the genus <a title="Bidens" href="https://en.wikipedia.org/wiki/Bidens">Bidens</a>, collectively called kokoʻolau or koʻokoʻolau in the Hawaiian language. It is found only in <a title="Hawaiian tropical dry forests" href="https://en.wikipedia.org/wiki/Hawaiian_tropical_dry_forests">dry forests</a> in the Waiʻanae Range on Oʻahu. It is threatened by <a class="mw-redirect" title="Habitat loss" href="https://en.wikipedia.org/wiki/Habitat_loss">habitat loss</a> due to the spread of <a class="mw-redirect" title="Invasive weed" href="https://en.wikipedia.org/wiki/Invasive_weed">invasive weeds</a> and <a class="mw-redirect" title="Brush fire" href="https://en.wikipedia.org/wiki/Brush_fire">brushfires</a>.

FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.The Plants Database includes the following 51 species of Bidens . Click below on a thumbnail map or name for species profiles. ... Bidens alba romerillo Bidens amplectens kokolau Bidens amplissima Vancouver Island beggarticks Bidens aristosa bearded beggarticks Bidens asymmetrica Koolau Range beggarticks Bidens aurea Arizona beggarticks Bidens.

Bidens amplectens

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Bidens campylotheca pentamera NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and <a href="https://www.earth.com/news/changing-ocean-soundscapes-impact-animals-worldwide/">animals</a> too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports -- Bidens campylotheca pentamera ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of <a href="https://www.bing.com/search?q=north+america&amp;cvid=a2805716fa254ddab0ac2db53248d72d&amp;FORM=ANAB01&amp;PC=HCTS">North America</a> and the world.is a relatively widespread with many small populations on Hawaiʻi, Lānaʻi, Oʻahu and Kauaʻi. It is listed as Vulnerable (IUCN). On Oʻahu this subspecies is found only in the Hauʻula area in the windward northern Koʻolau Mountains.

FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.

Bidens campylotheca, the viper beggarticks, is a <a title="Species" href="https://en.wikipedia.org/wiki/Species">species</a> of flowering plant in the <a title="Family (biology)" href="https://en.wikipedia.org/wiki/Family_(biology)">family</a> <a title="Asteraceae" href="https://en.wikipedia.org/wiki/Asteraceae">Asteraceae</a>. It belongs to the genus <a title="Bidens" href="https://en.wikipedia.org/wiki/Bidens">Bidens</a>, collectively called kokoʻolau or koʻokoʻolau in the <a title="Hawaiian language" href="https://en.wikipedia.org/wiki/Hawaiian_language">Hawaiian language</a>. It is found only in the <a title="Hawaiian Islands" href="https://en.wikipedia.org/wiki/Hawaiian_Islands">Hawaiian Islands</a>.

Its natural <a title="Habitat" href="https://en.wikipedia.org/wiki/Habitat">habitat</a> is lowland <a title="Hawaiian tropical rainforests" href="https://en.wikipedia.org/wiki/Hawaiian_tropical_rainforests">moist forests</a>. It is threatened by habitat loss due to the spread of invasive weeds and brushfires.
<dl>
 	<dt>Subspecies</dt>
</dl>
<ul>
 	<li>Bidens campylotheca subsp. campylotheca</li>
 	<li>Bidens campylotheca subsp. pentamera (Sherff) Ganders &amp; Nagata</li>
</ul>

Bidens campylotheca pentamera

Bidens campylotheca pentamera NatureServe Explorer Species Reports -- NatureServe Explorer...

Bidens campylotheca waihoiensis NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports -- Bidens campylotheca waihoiensis ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, <a href="https://www.earth.com/news/changing-ocean-soundscapes-impact-animals-worldwide/">animals</a>, fungi, and microbes of North America and the world. The goal of Native Plants Hawaii (NPH) is to create and establish a single, comprehensive and searchable online database / knowledgebase with information updated by participating nurseries and specialists. This will connect local nurseries to landscape architects and home growers to promote the use and understanding of local native plants. Also campylotheca is a relatively widespread with many small populations on Hawaiʻi, Lānaʻi, Oʻahu and Kauaʻi. It is listed as Vulnerable (IUCN). On Oʻahu this subspecies is found only in the Hauʻula area in the windward northern Koʻolau Mountains.

Bidens campylotheca, the viper beggarticks, is a <a title="Species" href="https://en.wikipedia.org/wiki/Species">species</a> of <a title="Flowering plant" href="https://en.wikipedia.org/wiki/Flowering_plant">flowering plant</a> in the <a title="Family (biology)" href="https://en.wikipedia.org/wiki/Family_(biology)">family</a> Asteraceae. It belongs to the <a title="Genus" href="https://en.wikipedia.org/wiki/Genus">genus</a> <a title="Bidens" href="https://en.wikipedia.org/wiki/Bidens">Bidens</a>, collectively called kokoʻolau or koʻokoʻolau in the Hawaiian language. It is found only in the Hawaiian Islands.

Its natural <a title="Habitat" href="https://en.wikipedia.org/wiki/Habitat">habitat</a> is lowland <a title="Hawaiian tropical rainforests" href="https://en.wikipedia.org/wiki/Hawaiian_tropical_rainforests">moist forests</a>. It is threatened by <a class="mw-redirect" title="Habitat loss" href="https://en.wikipedia.org/wiki/Habitat_loss">habitat loss</a> due to the spread of <a class="mw-redirect" title="Invasive weed" href="https://en.wikipedia.org/wiki/Invasive_weed">invasive weeds</a> and <a class="mw-redirect" title="Brush fire" href="https://en.wikipedia.org/wiki/Brush_fire">brushfires</a>.
<dl>
 	<dt>Subspecies</dt>
</dl>
FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.

Bidens campylotheca waihoiensis

Bidens campylotheca waihoiensis NatureServe Explorer Species Reports -- NatureServe Explorer...

Bidens conjuncta NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, <a href="https://www.earth.com/news/changing-ocean-soundscapes-impact-animals-worldwide/">animals</a> and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports -- ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.

FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.

Bidens conjuncta, the bog beggarticks, is a <a title="Species" href="https://en.wikipedia.org/wiki/Species">species</a> of <a title="Flowering plant" href="https://en.wikipedia.org/wiki/Flowering_plant">flowering plant</a> in the <a title="Asteraceae" href="https://en.wikipedia.org/wiki/Asteraceae">sunflower family</a>. It belongs to the <a title="Genus" href="https://en.wikipedia.org/wiki/Genus">genus</a> <a title="Bidens" href="https://en.wikipedia.org/wiki/Bidens">Bidens</a>, collectively called kokoʻolau or koʻokoʻolau in the <a title="Hawaiian language" href="https://en.wikipedia.org/wiki/Hawaiian_language">Hawaiian language</a>. Bidens conjuncta is found only on western <a title="Maui" href="https://en.wikipedia.org/wiki/Maui">Maui</a>.

Its natural <a title="Habitat" href="https://en.wikipedia.org/wiki/Habitat">habitat</a> are <a title="Hawaiian tropical rainforests" href="https://en.wikipedia.org/wiki/Hawaiian_tropical_rainforests#Wet_forests">wet forests</a> and <a title="Hawaiian tropical rainforests" href="https://en.wikipedia.org/wiki/Hawaiian_tropical_rainforests#Bogs">bogs</a>. It is threatened by <a class="mw-redirect" title="Habitat loss" href="https://en.wikipedia.org/wiki/Habitat_loss">habitat loss</a> due to the spread of <a class="mw-redirect" title="Invasive weed" href="https://en.wikipedia.org/wiki/Invasive_weed">invasive weeds</a> and brush fires Bidens conjuncta is rare and found scattered in wet forest and bogs, as well as ridges and gulches, from about 2950 to around 4400 feet on montane summits of West Maui.

Bidens conjuncta

Bidens conjuncta NatureServe Explorer Species Reports -- NatureServe Explorer is...

Bidens hillebrandiana ssp. hillebrandiana NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and <a href="https://www.earth.com/image/the-fall-rhapsody-in-ottawa/">Canada.</a> NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports -- Bidens hillebrandiana ssp. hillebrandiana ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.Bidens is a <a title="Genus" href="https://en.wikipedia.org/wiki/Genus">genus</a> of <a title="Flowering plant" href="https://en.wikipedia.org/wiki/Flowering_plant">flowering plants</a> in the aster <a title="Family (biology)" href="https://en.wikipedia.org/wiki/Family_(biology)">family</a>, <a title="Asteraceae" href="https://en.wikipedia.org/wiki/Asteraceae">Asteraceae</a>. The common names beggarticks, black jack, burr marigolds, cobbler's pegs, Spanish needles, stickseeds, tickseeds and tickseed sunflowers refer to the fruits of the plants, most of which are bristly and barbed, with two sharp <a class="mw-redirect" title="Pappus (flower structure)" href="https://en.wikipedia.org/wiki/Pappus_(flower_structure)">pappi</a> at the end. The generic name refers to the same character; Bidens comes from the <a title="Latin" href="https://en.wikipedia.org/wiki/Latin">Latin</a> bis ("two") and dens ("tooth").The plants are <a class="mw-redirect" title="Zoochorous" href="https://en.wikipedia.org/wiki/Zoochorous">zoochorous</a>; their seeds will stick to clothing, fur or feathers, and be carried to new <a title="Habitat" href="https://en.wikipedia.org/wiki/Habitat">habitat</a>. This has enabled them to colonize a wide range, including many <a class="mw-redirect" title="Oceanic island" href="https://en.wikipedia.org/wiki/Oceanic_island">oceanic islands</a>. Some of these species occur only in a very restricted range and several are now threatened with <a title="Extinction" href="https://en.wikipedia.org/wiki/Extinction">extinction</a>, notably in the <a title="Hawaiian Islands" href="https://en.wikipedia.org/wiki/Hawaiian_Islands">Hawaiian Islands</a>. Due to the absence of native mammals on these islands, some of the oceanic island <a title="Taxon" href="https://en.wikipedia.org/wiki/Taxon">taxa</a> have reduced burrs, <a title="Evolution" href="https://en.wikipedia.org/wiki/Evolution">evolving</a> features that seem to aid in dispersal by the wind instead.

FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.

Bidens hillebrandiana ssp. hillebrandiana

Bidens hillebrandiana ssp. hillebrandiana NatureServe Explorer Species Reports -- NatureServe...

Bidens micrantha ctenophylla NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common <a href="https://www.earth.com/video/plants-cannot-keep-up-with-rising-co2-levels/">plants</a> and animals too.

Bidens micrantha ctenophylla NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network. Bidens micrantha is a species of flowering plant in the <a title="Asteraceae" href="https://en.wikipedia.org/wiki/Asteraceae">aster family</a> known by the common name grassland beggarticks. It is <a title="Endemism" href="https://en.wikipedia.org/wiki/Endemism">endemic</a> to the Hawaiian Islands, where it and other <a title="Bidens" href="https://en.wikipedia.org/wiki/Bidens">Bidens</a> species are known as kōʻokoʻolau. It occurs in many types of habitat on Lānaʻi, Maui, and Hawaiʻi, including rocky cliffs, dry forests, mesic forests, wet forests, and high shrublands.

ITIS Reports -- ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of <a href="https://www.bing.com/search?q=north+america&amp;cvid=d5936a7d5d3a44368a7133fc22a94410&amp;FORM=ANAB01&amp;PC=HCTS">North America</a> and the world.

FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.3 subspecies of Bidens micrantha . Click below on a thumbnail map or name for subspecies profiles. ... Bidens micrantha ssp. ctenophylla grassland beggarticks Bidens micrantha ssp. kalealaha Kalealaha beggarticks Bidens micrantha ssp. micrantha grassland beggarticks Legal Status. Wetland Status ...

Bidens micrantha ctenophylla

Bidens micrantha ctenophylla NatureServe Explorer Species Reports -- NatureServe Explorer...

Bidens micrantha ssp. kalealaha NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and<a href="https://www.earth.com/image/mistastin-lake-in-labrador-canada/"> Canada</a>. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports -- Bidens micrantha ssp. kalealaha ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of <a href="https://www.bing.com/search?q=north+america&amp;cvid=04199c903ec340abbe76ed5437dee267&amp;aqs=edge.0.69i59l2j69i57j69i59j69i60l3.622j0j1&amp;pglt=43&amp;FORM=ANNTA1&amp;PC=HCTS">North America</a> and the world. North America is a continent entirely within the Northern Hemisphere and almost all within the Western Hemisphere. It can also be described as the northern subcontinent of the Americas. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Caribbean Sea, and to the west and south by the Pacific Ocean. Because it is on the North American Tectonic Plate, Greenland is included as part of North America geographically. North America covers an area of about 24,709,000 square kilometers (9,540,000 square miles), about 16.5% of the Earth's land area and about 4.8% of its total surface. North America is the third-largest continent by area, following Asia and Africa, and the fourth by population after Asia, Africa, and Europe.

FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.

Bidens micrantha ssp. kalealaha

Bidens micrantha ssp. kalealaha NatureServe Explorer Species Reports -- NatureServe...

Bidens wiebkei NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common <a href="https://www.bing.com/search?q=plants&amp;cvid=b34eb2817cd64ebebe5bdb3ed25137ee&amp;FORM=ANAB01&amp;PC=HCTS">plants</a> and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports -- Bidens wiebkei ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.Bidens wiebkei, the Molokaʻi koʻokoʻolau or Wiebke's beggarticks, is a species of flowering plant in the family Asteraceae. It belongs to the genus Bidens, collectively called kokoʻolau or koʻokoʻolau in the Hawaiian language. It is found only on Molokaʻi in the <a href="https://www.earth.com/image/snow-on-hawaiis-tallest-peaks/">Hawaiian</a> Islands. There are three occurrences of the plant remaining, for a total population of fewer than 1000.

FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.iebke's beggarticks Subordinate Taxa. This plant has no children Legal Status. Threatened and Endangered Information: This plant is listed by the U.S. federal government or a state. Common names are from state and federal lists. Click on a place name to get a complete protected plant. The opposite, pinnately compound leaves are 2.8-5.1 in (7.1-13 cm) long; individual leaves are comprised of three to seven leaflets, each 1-3 in (2.5 cm-7.6 cm) long and 0.4-l in (1-2.5 cm) wide. The flower heads are arranged on side branches in clusters.

Bidens wiebkei

Bidens wiebkei NatureServe Explorer Species Reports -- NatureServe Explorer is...

Blennosperma bakeri NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and<a href="https://www.earth.com/image/the-fall-rhapsody-in-ottawa/"> Canada.</a> NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports -- Blennosperma bakeri ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of <a href="https://www.bing.com/search?q=north+america&amp;cvid=b756a0a68c7f4955bcbfef429920eff2&amp;FORM=ANAB01&amp;PC=HCTS">North America</a> and the world.

FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.It is <a title="Endemism" href="https://en.wikipedia.org/wiki/Endemism">endemic</a> to Sonoma County, California, where it is known from a few remaining <a title="Vernal pool" href="https://en.wikipedia.org/wiki/Vernal_pool">vernal pool</a> sites on the wet grasslands of the Laguna de Santa Rosa and Sonoma Valley. It is a federally listed endangered species. It is found alongside other rare vernal pool plants including the Sebastopol meadowfoam, Limnanthes vinculans, and Burke's goldfields, Lasthenia burkei. Threats to its survival include the alteration of its habitat for development, road maintenance, grazing, and agriculture, as well as collecting, herbivory by <a title="Thrips" href="https://en.wikipedia.org/wiki/Thrips">thrips</a>, and invasive plants.

Blennosperma bakeri

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Boltonia decurrens NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports -- Boltonia decurrens ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of <a href="https://www.bing.com/search?q=north+america&amp;cvid=6a234dc4e21c4215bbb24e1ae6be57fb&amp;FORM=ANAB01&amp;PC=HCTS">North America</a> and the world.Despite having declined over time, several populations of the plant contain many thousands of individuals. Populations vary depending on the amount and duration of flooding that occurs in the area each year. The plant is a federally listed threatened species.

FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.Boltonia decurrens is a rare species of flowering plant in the aster family known by the common names decurrent false aster and claspingleaf doll's daisy.

It is native to the floodplains along the Illinois and Mississippi Rivers in the United States, where the habitat has been drastically altered, leading to its decline. The plant was once distributed across 400 kilometers of riverside forest from LaSalle, Illinois, to St. Louis, <a href="https://www.earth.com/image/missouri-breaks-complex-fire-montana/">Missouri.</a> As the rivers and riparian habitat alongside them have been developed, the plant's.

Boltonia decurrens

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Bonamia grandiflora NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports -- ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.

FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.

Bonamia grandiflora is a rare species of flowering plant in the <a title="Convolvulaceae" href="https://en.wikipedia.org/wiki/Convolvulaceae">morning glory family</a> known by the common names Florida lady's nightcap, Florida bonamia, and scrub morning glory. It is <a title="Endemism" href="https://en.wikipedia.org/wiki/Endemism">endemic</a> to <a title="Central Florida" href="https://en.wikipedia.org/wiki/Central_Florida">Central Florida</a>, where there are about 100 known populations remaining, many of which are within the bounds of the <a title="Ocala National Forest" href="https://en.wikipedia.org/wiki/Ocala_National_Forest">Ocala National Forest</a>.<a href="https://en.wikipedia.org/wiki/Bonamia_grandiflora#cite_note-cpc-1">[1]</a> The plant has declined in recent decades primarily due to the development of its habitat, which is being converted to urban zones and <a title="Citrus" href="https://en.wikipedia.org/wiki/Citrus">citrus</a> <a title="Orchard" href="https://en.wikipedia.org/wiki/Orchard">groves</a>.<a href="https://en.wikipedia.org/wiki/Bonamia_grandiflora#cite_note-tnc-2">[2]</a> This is the primary reason that the plant was federally listed as a threatened species in 1987.<a href="https://en.wikipedia.org/wiki/Bonamia_grandiflora#cite_note-fed-3">[3]</a>

This native Florida wildflower is a perennial <a title="Vine" href="https://en.wikipedia.org/wiki/Vine">vine</a> which trails along the ground to a maximum length around 3 meters. There is a deep root and multiple underground stems. The hairy stem is lined with leathery, gray-green leaves up to 5 centimeters long. The <a title="Inflorescence" href="https://en.wikipedia.org/wiki/Inflorescence">inflorescence</a> is a single showy flower borne on a short, erect <a title="Peduncle (botany)" href="https://en.wikipedia.org/wiki/Peduncle_(botany)">peduncle</a>. The flower corolla opens in the morning, spreading 7 or 8 centimeters wide and up to 10 centimeters long. It is pale to bright blue-purple with a white throat. At the center of the funnel-shaped corolla are five <a title="Stamen" href="https://en.wikipedia.org/wiki/Stamen">stamens</a> tipped with yellow anthers. The fruit is a capsule around a centimeter in length containing a few seeds.

Bonamia grandiflora

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Bonamia menziesii NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and <a href="https://www.earth.com/image/the-fall-rhapsody-in-ottawa/">Canada</a>. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports -- Bonamia menziesii ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.Hawai'i lady's nightcap Subordinate Taxa. This plant has no children Legal Status. Threatened and Endangered Information: This plant is listed by the U.S. federal government or a state. Common names are from state and federal lists.

FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.Bonamia menziesii, commonly known as Hawaiʻi lady's nightcap, is a species of flowering plant in the morning glory family, Convolvulaceae, that is endemic to Hawaii. It is a vine or twisting liana with branches that can reach 10 m in length. Hawaiʻi lady's nightcap inhabits steep slopes and level ground in dry, coastal mesic, mixed mesic, and, sometimes, wet forests at elevations of 150–625 m.

Bonamia menziesii

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Brickellia mosieri NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and <a href="https://www.bing.com/search?q=animals&amp;cvid=86cf9ee4f2d94f8d9c35dd5ee63c51e9&amp;FORM=ANAB01&amp;PC=HCTS">animals</a> too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports -- Brickellia mosieri ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of <a href="https://www.earth.com/earthpedia-articles/perennial-vegetables-to-grow-in-north-america/">North America</a> and the world.Comments: Brickellia mosieri was listed as Endangered under the Endangered Species Act on September 4, 2014. For more information, see the USFWS species profile. Other data on Brickellia mosieri.arranted-but-precluded priority 8 (moderate to low threat magnitude, imminent threat immediacy, and species taxonomic distinctiveness) petitioned canidate

FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.Brickellia eupatorioides is a North American species of flowering plants in the daisy family. It is widespread in Mexico from Chihuahua to Oaxaca, and in all regions of the contiguous United States except New England, New York, and the West Coast.

Brickellia mosieri

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Brighamia insignis NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports -- ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.

It is extremely rare. In 1994 the <a title="United States Fish and Wildlife Service" href="https://en.wikipedia.org/wiki/United_States_Fish_and_Wildlife_Service">United States Fish and Wildlife Service</a> reported five populations totaling 45 to 65 individuals, and listed the plant as an <a title="Endangered species" href="https://en.wikipedia.org/wiki/Endangered_species">endangered species</a>. As of today, the species is possibly extinct in the wild. The last single individual was recorded in the wild in 2014.

Brighamia insignis is found at elevations from sea level to 480 m (1,570 ft) in <a title="Hawaiian tropical rainforests" href="https://en.wikipedia.org/wiki/Hawaiian_tropical_rainforests#Coastal_mesic_forests">mesic shrublands</a> and <a title="Hawaiian tropical dry forests" href="https://en.wikipedia.org/wiki/Hawaiian_tropical_dry_forests">dry forests</a> that receive less than 170 cm (67 in) of annual rainfall. It grows on rocky ledges with little <a title="Soil" href="https://en.wikipedia.org/wiki/Soil">soil</a> and steep sea <a title="Cliff" href="https://en.wikipedia.org/wiki/Cliff">cliffs</a>. Associated plants include ʻāhinahina (<a title="Artemisia (genus)" href="https://en.wikipedia.org/wiki/Artemisia_(genus)">Artemisia</a> spp.) ʻakoko (<a title="Euphorbia celastroides" href="https://en.wikipedia.org/wiki/Euphorbia_celastroides">Euphorbia celastroides</a>), alaheʻe (<a title="Psydrax odorata" href="https://en.wikipedia.org/wiki/Psydrax_odorata">Psydrax odorata</a>), kāwelu (<a title="Eragrostis" href="https://en.wikipedia.org/wiki/Eragrostis">Eragrostis</a> <a title="Eragrostis variabilis" href="https://en.wikipedia.org/wiki/Eragrostis_variabilis">variabilis</a>), pili (<a title="Heteropogon contortus" href="https://en.wikipedia.org/wiki/Heteropogon_contortus">Heteropogon contortus</a>), kokiʻo ʻula (<a title="Hawaiian hibiscus" href="https://en.wikipedia.org/wiki/Hawaiian_hibiscus">Hibiscus kokio</a>), ʻānaunau (<a title="Lepidium" href="https://en.wikipedia.org/wiki/Lepidium">Lepidium</a> <a class="new" title="Lepidium serra (page does not exist)" href="https://en.wikipedia.org/w/index.php?title=Lepidium_serra&amp;action=edit&amp;redlink=1">serra</a>), nehe (<a title="Lipochaeta succulenta" href="https://en.wikipedia.org/wiki/Lipochaeta_succulenta">Lipochaeta succulenta</a>), pokulakalaka (<a class="mw-redirect" title="Munroidendron racemosum" href="https://en.wikipedia.org/wiki/Munroidendron_racemosum">Munroidendron racemosum</a>), and ʻilima (<a title="Sida fallax" href="https://en.wikipedia.org/wiki/Sida_fallax">Sida fallax</a>).

FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.

Brighamia insignis

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Brighamia rockii NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.Brighamia is an endemic genus and both species are endangered. Brighamia rockii grows on sea cliffs from sea level to 1,500 feet on the windward coast of

ITIS Reports -- Brighamia rockii ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, <a href="https://www.bing.com/search?q=animals&amp;cvid=0a9d731926574a03b642de39333587ca&amp;FORM=ANAB01&amp;PC=HCTS">animals</a>, fungi, and microbes of <a href="https://www.earth.com/earthpedia-articles/perennial-vegetables-to-grow-in-north-america/">North America</a> and the world.

FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.Brighamia rockii, known as the Molokai ohaha or Pua ʻala in Hawaiian, is a species of flowering plant in the bellflower family, Campanulaceae, that is endemic to the island of Molokaʻi in Hawaii. Pua ʻala inhabits mesic shrublands and forests on rocky cliffs from sea level to 470 m on the island's northern windward coast. Associated plants include ʻōhiʻa lehua, alaheʻe, lama, ʻūlei, and naupaka.

Brighamia rockii

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Brodiaea filifolia NatureServe Explorer Species Reports -- NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.

ITIS Reports -- ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.

Brodiaea filifolia, known by the common name threadleaf brodiaea, is a rare species of flowering plant in the <a title="Brodiaea" href="https://en.wikipedia.org/wiki/Brodiaea">cluster-lily genus</a> . It is <a title="Endemism" href="https://en.wikipedia.org/wiki/Endemism">endemic</a> to southern <a title="California" href="https://en.wikipedia.org/wiki/California">California</a>, mostly in the region around the junction of <a title="Orange County, California" href="https://en.wikipedia.org/wiki/Orange_County,_California">Orange</a>, <a title="Riverside County, California" href="https://en.wikipedia.org/wiki/Riverside_County,_California">Riverside</a>, and <a title="San Diego County, California" href="https://en.wikipedia.org/wiki/San_Diego_County,_California">San Diego Counties</a>.

The bulb is a resident of scattered remaining <a title="Vernal pool" href="https://en.wikipedia.org/wiki/Vernal_pool">vernal pool</a> and <a title="Grassland" href="https://en.wikipedia.org/wiki/Grassland">grassland</a> habitats. It is a federally listed threatened species and it is listed as an <a title="Endangered species" href="https://en.wikipedia.org/wiki/Endangered_species">endangered species</a> on the state level.

FWS Digital Media Library -- The U.S. Fish and Wildlife Service's National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.This plant occurs in <a title="Grassland" href="https://en.wikipedia.org/wiki/Grassland">grassland</a> areas, often in <a title="Floodplain" href="https://en.wikipedia.org/wiki/Floodplain">floodplains</a>, and it is a member of the local vernal pool flora. It requires heavy <a title="Clay" href="https://en.wikipedia.org/wiki/Clay">clay</a> soils. This type of habitat is becoming very rare as it is being cleared for development, especially as residential areas expand. Undeveloped land near residential areas is degraded by <a title="Introduced species" href="https://en.wikipedia.org/wiki/Introduced_species">exotic vegetation</a>, <a class="mw-redirect" title="Mowing" href="https://en.wikipedia.org/wiki/Mowing">mowing</a> and other <a class="mw-redirect" title="Fire suppression" href="https://en.wikipedia.org/wiki/Fire_suppression">fire suppression</a> efforts, <a title="Sewage" href="https://en.wikipedia.org/wiki/Sewage">sewage</a> dumping, <a title="Grazing" href="https://en.wikipedia.org/wiki/Grazing">grazing</a> of <a title="Livestock" href="https://en.wikipedia.org/wiki/Livestock">livestock</a>, <a title="Off-road vehicle" href="https://en.wikipedia.org/wiki/Off-road_vehicle">off-road vehicle</a> use, and other processes.

Brodiaea filifolia

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Species don’t all carve out territory the same way. A sweeping analysis across the tree of life shows that, on average, older lineages occupy larger geographical ranges than younger ones.



The relationship isn’t uniform - <a href="https://www.earth.com/news/marine-mammals-in-the-us-are-highly-vulnerable-to-climate-change/">marine mammals</a> buck the trend, and islands add their own twists - but evolutionary time consistently emerges as a powerful predictor of how far a species spreads.



An international team led by scientists at the German Center for Integrative Biodiversity Research (<a href="https://www.idiv.de/" target="_blank" rel="noreferrer noopener">iDiv</a>), Leipzig University, and the Naturalis Biodiversity Center compared evolutionary age and present-day range size for more than 26,000 species.



<h2 class="wp-block-heading" id="h-a-panoramic-look-across-26-000-species"><a></a>A panoramic look across 26,000 species</h2>



The dataset spanned seven major groups - <a href="https://www.earth.com/news/birds-are-struggling-to-keep-pace-with-a-warming-climate/">birds</a>, reptiles, amphibians, reef fishes, palms, and both terrestrial and marine mammals - providing one of the broadest tests yet of how age shapes distribution.



The headline result is straightforward: older species tend to have larger ranges. That pattern appeared across every group except marine mammals. The logic is intuitive but has not been demonstrated at this scale.



“Older species are expected to have larger distributions because they have had more time, sometimes several millions of years, to expand their ranges since first appearing,” explained first author Adriana Alzate, a scientist at Naturalis.



“Over evolutionary timescales, these species have had more opportunities to reproduce, disperse, colonize, and adapt to diverse environments, allowing them to occupy broader geographical areas.”



<h2 class="wp-block-heading" id="h-dispersal-power-changes-the-pace"><a></a>Dispersal power changes the pace</h2>



Time alone doesn’t tell the whole story. How easily a species moves through landscapes - its dispersal ability - can speed or slow the march outward.



Strong fliers such as birds with long, pointed wings, and <a href="https://www.earth.com/news/fossil-reveals-how-plants-use-winged-seeds-to-expand-their-habitats/">plants</a> whose seeds travel with large, wide-ranging animals, often achieve broad ranges quickly. Poor dispersers, including many amphibians, expand more slowly; for them, age exerts a stronger influence because overcoming barriers takes generations.



The study’s cross-taxa lens makes those contrasts visible. Two species of similar age can differ dramatically in range simply because one can vault barriers while the other cannot. That natural experiment plays out worldwide, from continental interiors to archipelagos.



<h2 class="wp-block-heading" id="h-islands-rewrite-the-rules"><a></a>Islands rewrite the rules</h2>



Geography sets hard limits, and nowhere is that clearer than on islands. Native species confined to islands necessarily have smaller maximum ranges than their mainland relatives.



The team confirmed that basic constraint, but they also uncovered an unexpected nuance: the gap between young and old species’ ranges is even larger on islands than on continents.



“Island dynamics and ontogeny modulate the relationship between age and range size. Release from predators and competitors may have enabled early island colonizers, typically ecological generalists, to achieve broader ranges than expected based on age only,” said co-author Roberto Rozzi, a scientist at iDIV.



In other words, the first arrivals - often flexible in diet and habitat - can spread widely within the island system, cementing a strong age–range link even under geographic caps.



<h2 class="wp-block-heading" id="h-why-range-size-matters-for-survival"><a></a>Why range size matters for survival</h2>



Range size isn’t just a biogeographic curiosity; it’s one of the strongest predictors of <a href="https://www.earth.com/news/animal-extinction-risk-is-heavily-influenced-by-climate-change/">extinction risk</a>. Species with narrow distributions usually have smaller total populations and fewer local strongholds. 



They are more vulnerable to droughts, storms, disease outbreaks, invasive species, and human disturbance. With more than 40,000 species currently facing extinction, understanding what governs range size can sharpen conservation priorities.



That’s especially important as climate change scrambles habitats. If older species generally occupy larger, more environmentally diverse ranges, they may carry genetic variation that helps them cope with shifting conditions.



“This is even more important in the context of changing environmental conditions, because not all species may be able to keep up with these changes,” said senior author Renske Onstein, a biologist at iDIV. 



“Possibly, older species have the genetic makeup to more readily adapt and therefore persist in their relatively large ranges. This needs further testing with genetic data, for example, providing exciting possibilities for future research."



<h2 class="wp-block-heading" id="h-takeaways-for-conservation-strategies">Takeaways for conservation strategies </h2>



The study highlights three practical lessons for managers. First, evolutionary age can be a useful flag when assessing exposure to risk: younger, poor-dispersing species with small ranges may need faster, more targeted intervention.



Second, island biotas demand tailored strategies that account for their tight geographic limits and unique dynamics. 



Third, bolstering connectivity - through corridors and habitat restoration - can partially compensate for weak dispersal, giving species the chance to expand or shift ranges as climates warm.



Crucially, the work also warns against one-size-fits-all assumptions. <a href="https://www.earth.com/news/these-marine-mammals-killer-whales-dolphins-permanently-lost-ability-to-ever-walk-again/">Marine mammals</a>, for instance, didn’t follow the main pattern, likely reflecting the fluidity of ocean habitats and the long-distance movements of many whale and dolphin species. The lesson is to treat age as a powerful factor, not a universal rule.



<h2 class="wp-block-heading" id="h-a-clock-a-map-and-a-moving-target">A clock, a map, and a moving target</h2>



Range size emerges from the interplay of time, traits, and terrain. Evolutionary “clock time” creates opportunities; dispersal traits determine how readily species seize them; geography dictates what’s possible. 



By stitching those pieces together across tens of thousands of species, the researchers show that age leaves a durable imprint on where life lives today.



For conservation in a rapidly changing world, that imprint is more than academic. It helps explain why some species are widespread while their close relatives cling to a single valley or reef. 



And it offers a clearer map of where limited resources can do the most good - before small ranges become no ranges at all.



The study is published in the journal <a href="https://www.nature.com/articles/s41467-025-62124-y" target="_blank" rel="noreferrer noopener">Nature Communications</a>.



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Why older species may be better survivors

Species don’t all carve out territory the same way. A...

Scientists have engineered wheat to nudge soil bacteria into producing plant-ready nitrogen, a shift that could cut fertilizer use, curb pollution, and lower farm costs without sacrificing yields. 



The plants overproduce a natural compound, leak the excess into the soil, and in doing so jumpstart nearby microbes that “fix” nitrogen from the air into forms crops can use.



In this work, a team at the <a href="https://www.ucdavis.edu/" target="_blank" rel="noreferrer noopener">University of California, Davis</a>, led by Eduardo Blumwald, used <a href="https://www.earth.com/news/crispr-used-to-remove-extra-chromosomes-in-down-syndrome-and-restore-cell-function/">CRISPR</a> to dial up a wheat metabolite and tested the effect under low-nitrogen conditions.



The study extends earlier proof-of-concept in rice, with efforts underway to translate the approach to other staple cereals.



<h2 class="wp-block-heading" id="h-synthetic-nitrogen-fuels-global-harvests">Synthetic nitrogen fuels global harvests</h2>



Worldwide, synthetic nitrogen fuels modern harvests but at a steep environmental and economic price. Wheat alone accounts for about 18 percent of global nitrogen fertilizer use. Of the hundreds of millions of tons produced each year, plants capture only 30 to 50 percent.



The remainder washes into rivers and coasts, feeding oxygen-starved <a href="https://www.earth.com/news/excess-nutrients-are-creating-ocean-dead-zones/">dead zones</a>, or escapes as nitrous oxide, a potent greenhouse gas. For smallholder farmers, especially in low-income regions, cost and access make fertilizer a gamble.



“In Africa, people don't use fertilizers because they don’t have money, and farms are small, not larger than six to eight acres,” Blumwald said. “Imagine, you are planting crops that stimulate bacteria in the soil to create the fertilizer that the crops need, naturally. Wow! That’s a big difference!”



<h2 class="wp-block-heading" id="h-wheat-learns-microbes-nitrogen-trick">Wheat learns microbes’ nitrogen trick</h2>



Nitrogen fixation is carried out by specialized bacteria using an enzyme called nitrogenase, which only functions in low-oxygen conditions. Legumes such as beans and peas solve this by hosting the <a href="https://www.earth.com/news/plants-have-root-microbiomes-like-humans-do-vital-for-survival-defense/">microbes</a> in root nodules, which are tiny oxygen-poor chambers. 



Cereals like wheat lack nodules, which is why they rely on bagged nitrogen. Rather than trying to give cereals nodules or force microbes to colonize roots - a strategy that has long struggled to stick - the team flipped the problem.



The researchers screened roughly 2,800 plant-made chemicals and found a small set, including flavones, that prompt soil <a href="https://www.earth.com/news/when-bacteria-get-hungry-they-turn-on-each-other/">bacteria</a> to form protective biofilms. Those sticky microbial coats reduce oxygen exposure enough for nitrogenase to work.



“For decades, scientists have been trying to develop cereal crops that produce active root nodules, or trying to colonize cereals with nitrogen-fixing bacteria, without much success. We used a different approach,” Blumwald said.



“We said the location of the nitrogen-fixing bacteria is not important, so long as the fixed nitrogen can reach the plant, and the plant can use it.”



<h2 class="wp-block-heading" id="h-gene-edit-flips-fertilizer-switch">Gene edit flips fertilizer switch</h2>



Using CRISPR, the researchers boosted wheat’s production of apigenin, a common flavone. Plants kept what they needed and exuded the surplus through their roots.



In soil tests, the extra apigenin encouraged local bacteria to spin up biofilms, protecting nitrogenase, fixing nitrogen, and making ammonium available for the crop. In low-fertility conditions, edited wheat assimilated the microbially supplied nitrogen and outyielded control plants.



The amazing thing lies in what the plant does automatically. It manufactures the signal, leaks it when nitrogen is scarce, and benefits from the neighborhood effect. No external inoculants are required, and the microbes remain free-living in the <a href="https://www.earth.com/news/new-type-of-microbes-found-earths-deep-soil-critical-zone/">soil</a> rather than locked inside a root.



<h2 class="wp-block-heading" id="h-pollution-down-resilience-up"><a></a>Pollution down, resilience up</h2>



If scaled, the approach could trim the fertilizer footprint that drives water pollution and climate forcing in wheat and other crops. Less soluble nitrogen applied to fields means less runoff during storms, smaller algal blooms, and fewer oxygen crashes in <a href="https://www.earth.com/news/climate-shock-lakes-are-losing-oxygen-faster-than-expected/">lakes</a> and coastal zones. 



Cutting back on industrial nitrogen also reduces upstream emissions from natural-gas-intensive fertilizer production.



Because the mechanism amplifies microbial activity already present in many soils, it may also help stabilize yields under input constraints. In places where fertilizer is scarce or prohibitively expensive, the crop’s own chemistry becomes a lever to unlock atmospheric nitrogen.



<h2 class="wp-block-heading" id="h-billions-saved-with-less-fertilizer">Billions saved with less fertilizer</h2>



The United States alone saw nearly $36 billion in fertilizer spending in 2023. Cereals cover close to 500 million acres nationally. Even modest reductions in inputs translate into real money while lowering risk in volatile markets.



“Imagine, if you could save 10 percent of the amount of fertilizer being used on that land,” Blumwald said. “I’m calculating conservatively: That should be a savings of more than a billion dollars every year.”



Those savings would not come solely from buying less nitrogen. Fewer passes to apply fertilizer mean lower fuel use and less soil compaction. Reduced losses to waterways could also ease regulatory pressure and improve community relations in vulnerable watersheds.



<h2 class="wp-block-heading" id="h-proving-stability-across-soil-types">Proving stability across soil types</h2>



The road from greenhouse pots to farm fields is long, but the milestones are clear. Researchers will need to confirm that the nitrogen boost holds under diverse soils, climates, and microbiomes, and that it plays nicely with existing rotations and management. 



They will need to show stable performance across seasons and varieties, measure effects on soil ecology, and ensure that yields and grain quality are maintained.



Because the edit increases a native metabolite rather than introducing a foreign gene, regulatory pathways may be more straightforward in some jurisdictions. Still, farmers and policymakers will want transparent data on environmental outcomes, <a href="https://www.earth.com/news/how-solar-power-can-transform-urine-into-fertilizer/">fertilizer</a> savings, and return on investment.



If the results scale, gene-edited cereals like wheat that recruit their own microbial fertilizer factories could become a practical tool in the nitrogen toolbox - cutting costs where budgets are tight, trimming pollution where waters run foul, and building resilience in the breadbaskets of a warming world.



The study is published in the <a href="https://onlinelibrary.wiley.com/doi/10.1111/pbi.70289" target="_blank" rel="noreferrer noopener">Plant Biotechnology Journal</a>.



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Gene-edited wheat turns soil microbes into fertilizer

Scientists have engineered wheat to nudge soil bacteria into producing...

Farming spread across prehistoric Europe mostly because farming communities moved, not because local hunter-gatherers copied their ways. Cultural adoption played only a minimal role in the Neolithic transition, the period when agriculture took hold. 



A team of researchers at <a href="https://www.psu.edu/" target="_blank" rel="noreferrer noopener">Penn State</a> combined ancient DNA, archaeology, and computer simulations to separate the effects of <a href="https://www.earth.com/news/ancient-dna-reveals-human-migration-patterns-in-first-millennium-ad/">migration</a> from the uptake of new practices. 



The team modeled population movements, growth, and learning, then tested those models against genetic ancestry from hundreds of Neolithic individuals and against the known pace of farming’s advance from the Middle East into Europe.



<h2 class="wp-block-heading" id="h-two-sciences-unlock-farming-s-spread">Two sciences unlock farming’s spread</h2>



Christian Huber, an assistant professor of biology at Penn State and senior author on the paper, noted that archaeology and genetics offer complementary windows into this transition.



“Artifacts and isotopes in ancient bones can reveal whether a person relied on domesticated plants or animals, reflecting the adoption of new farming practices," said Huber. 



“At the same time, DNA preserved in those bones can show where people’s ancestors came from, providing evidence of migration, or the movement of farming populations into new regions.”



Archaeological traces show when <a href="https://www.earth.com/news/domesticating-wild-plants-may-result-in-more-resilient-crops/">domesticated crops</a> and animals appeared. Genomes preserve who arrived with them. 



By fusing those records within a single statistical framework, the team could estimate how much of farming’s spread came from people on the move and how much from ideas crossing cultural lines.



<h2 class="wp-block-heading" id="h-migration-versus-culture-finally-measured">Migration versus culture finally measured</h2>



“This has been a long-standing question - and disentangling the roles of migration and cultural adoption has been a goal of archaeologists and anthropologists for decades,” said study lead author Troy LaPolice, a doctoral student at Penn State.



“What we found was surprising: when cultures spread through migration, it is not guaranteed local ancestry patterns will change, but the spread of farming managed to leave a strong and lasting impact on European ancestry.”



The researchers simulated the front of farming as it rolled out from the Fertile Crescent roughly 10,000 years ago, reaching into the Balkans, then north and west across the continent. They fit those simulations to radiocarbon timelines and to ancestry profiles from 618 ancient individuals.



The results allowed them to assign weight to two forces - movement of farming groups and adoption by foragers - and to test which combination best reproduced the record.



<h2 class="wp-block-heading" id="h-farmers-moved-ideas-spread-slowly">Farmers moved, ideas spread slowly</h2>



The answer was clear. Migration dominated. Cultural transmission, the flow of practices without the movement of people, barely nudged the pace. 



The team’s estimates put the “cultural effect” at about half a percent. <a href="https://www.earth.com/news/stone-age-hunter-gatherers-had-a-very-organized-domestic-life/">Hunter-gatherers</a> in most places continued to forage even as farmsteads appeared nearby and, over generations, replaced their way of life.



“The assimilation rate, the rate at which hunter-gatherers were grafted into farming communities, was actually very low&nbsp; -&nbsp; only about one in 1,000 farmers converted a hunter-gatherer to farming each year,” Huber said.



“As a result, cultural transmission had almost no effect on how quickly farming spread. Still, even at this low rate, it left a lasting mark on the DNA of Europeans today and introduced useful genetic traits into the growing farming communities.”



That small but steady flow mattered biologically, even if it mattered little to the speed of the transition. 



Genes from local foragers entered the expanding farming populations. Some of those variants likely helped the newcomers adapt to new environments as they moved north into different climates and daylight regimes.



<h2 class="wp-block-heading" id="h-farming-and-foragers-rarely-mixed">Farming and foragers rarely mixed</h2>



The models also point to strong social boundaries. According to the team’s analysis, farmers overwhelmingly mated with farmers, and foragers with foragers. “Between-group” pairings were rare, on the order of less than three percent.



That pattern aligns with other ancient DNA studies showing persistent genetic differences between neighboring groups that shared landscapes for centuries.



Those findings help explain why the genetic imprint of the first farmers is so pervasive in Europe today. Once agricultural communities established themselves, their numbers grew more quickly than those of <a href="https://www.earth.com/news/birth-of-farming-driven-by-humans/">foragers</a>. 



Even with little intermarriage or conversion, demographic momentum carried their ancestry far.



<h2 class="wp-block-heading" id="h-dna-helps-rewrite-early-history">DNA helps rewrite early history</h2>



“It's really interesting to be able to understand a time period before any written or oral history,” LaPolice said. “This intense interdisciplinary project allowed us to undertake a new kind of historical reconstruction.”



The approach tested not just a story but a set of mechanisms. It allowed the team to ask what combinations of movement, growth, and learning could produce the archaeological and <a href="https://www.earth.com/news/ancient-dna-reveals-human-migration-patterns-in-first-millennium-ad/">genetic patterns</a> we see. 



It also let them probe how sensitive their conclusions were to assumptions about mating, mobility, and population size.



<h2 class="wp-block-heading" id="h-method-offers-tools-for-archaeology">Method offers tools for archaeology</h2>



The study adds to a growing body of work showing how ancient genomes can clarify human prehistory when paired with robust models.



It also echoes the team’s recent methodological papers assessing common ancestry tools - useful when applied carefully, but misleading when pushed beyond their limits.



“This research highlights the power of combining genetic data with archaeological models to uncover the complex behavioral mechanisms of our past,” Williams said. “Looking forward, I see this paving the way for a reevaluation of other major prehistoric cultural shifts.”



From metalworking to herding, from language dispersals to the rise of cities, many transformations reshaped ancient lives. The Penn State team’s framework offers a way to test whether those farming changes spread through people, ideas, or - most often - some blend of both.



The study is published in the journal <a href="https://www.nature.com/articles/s41467-025-63172-0" target="_blank" rel="noreferrer noopener">Nature Communications</a>.



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Ancient DNA shows what really spread the farming revolution

Farming spread across prehistoric Europe mostly because farming communities moved,...

From glowing mushrooms on forest floors to plankton that light up the sea, nature has long revealed beauty through bioluminescence. These natural spectacles capture human imagination, inspiring ideas of glowing gardens and self-lit cities. 



Scientists are now moving closer to that vision, crafting houseplants that radiate their own soft <a href="https://www.earth.com/news/amazon-trees-glow-more-under-stress-but-photosynthesize-less/">light</a>.



<h2 class="wp-block-heading" id="h-scientists-create-glowing-plants">Scientists create glowing plants</h2>



In a recent study published in the journal Matter, researchers described glowing succulents that recharge in sunlight and emit colorful afterglows. 



By injecting the <a href="https://www.earth.com/news/all-living-things-emit-a-subtle-glow-that-ceases-at-death/">leaves</a> with special light-storing particles, the plants become capable of radiating light bright enough to rival small night lamps.



“Picture the world of Avatar, where glowing plants light up an entire ecosystem,” said first author Shuting Liu of <a href="https://www.scau.edu.cn" target="_blank" rel="noreferrer noopener">South China Agricultural University</a>. “We wanted to make that vision possible using materials we already work with in the lab. Imagine glowing trees replacing streetlights.”



<h2 class="wp-block-heading" id="h-moving-past-genetic-engineering">Moving past genetic engineering</h2>



Earlier attempts at creating luminescent plants relied on genetic engineering. These methods typically produced faint green light and came with challenges: high costs, complex techniques, and risks such as gene drift. 



The new approach sidesteps these issues by using inorganic afterglow particles, materials already known for their roles in glowing toys and safety signs. These particles are inexpensive, widely available, and capable of storing light energy efficiently, making them an ideal choice for transforming <a href="https://www.earth.com/news/how-future-climate-conditions-will-transform-plant-growth/">plants</a> into living light sources. 



Unlike genetic methods, which require lengthy cultivation and complex engineering, this strategy allows for quick preparation, reproducibility, and scalability. It opens the door to practical applications in sustainable lighting and everyday decorative uses.



<h2 class="wp-block-heading" id="h-why-micron-particles-work">Why micron particles work</h2>



The team worked with micron-sized afterglow phosphors. While nanoparticles move more easily through leaves, the larger particles shine with greater brightness.



Traditionally, their size limited plant absorption, but the succulent Echeveria "Mebina" provided the right internal structure to carry them. Its dense but evenly spaced tissue channels enabled rapid diffusion, producing uniform and strong luminescence.



“Smaller, nano-sized particles move easily within the plant but are dimmer,” said Liu. “Larger particles glowed brighter but couldn’t travel far inside the plant.”



<h2 class="wp-block-heading" id="h-succulents-glow-better-than-leafy-plants">Succulents glow better than leafy plants</h2>



Unexpectedly, succulents outperformed non-succulents like golden pothos and bok choy. Despite having fewer air pockets than leafy plants, their compact, uniform tissue allowed particles to spread smoothly without clumping. 



This created evenly glowing leaves after just minutes of exposure to sunlight or LED light, with brightness lasting for nearly two hours.



“It was really unexpected,” said Liu. “The particles diffused in just seconds, and the entire succulent leaf glowed.”



<h2 class="wp-block-heading" id="h-stable-and-safe-glow">Stable and safe glow</h2>



The particles used were specially coated with phosphate to improve water resistance and ensure biocompatibility inside plant tissues. 



Tests showed that plants maintained normal chlorophyll, sugar, and protein levels even after several days, suggesting they can handle the modification without losing vitality.



This stability highlights the protective role of the phosphate layer, ensuring that luminescence persists without harmful side effects. 



The results also show that material-engineered plants can retain their natural functions and growth patterns under experimental conditions.



<h2 class="wp-block-heading" id="h-plants-glow-in-many-colors">Plants glow in many colors</h2>



By mixing different phosphors, researchers created plants that glowed not just green, but also red, blue, and even warm white. The team demonstrated a wall of 56 succulents glowing brightly enough to illuminate books and nearby objects. 



Patterns, such as letters or images, could be temporarily written on plant leaves with UV light, hinting at potential uses in decoration and information storage.



“Each plant takes about 10 minutes to prepare and costs a little over 10 yuan (about $1.4), not including labor,” said Liu.



<h2 class="wp-block-heading" id="h-eco-friendly-lighting-and-architecture">Eco-friendly lighting and architecture </h2>



The glow fades over time, but repeated exposure to light recharges it. This low-cost, reproducible method could pave the way for eco-friendly lighting in gardens, pathways, or interior design. 



Expanding beyond succulents remains a challenge, but the study shows a path forward. The research offers possibilities for future urban planning, sustainable architecture, and even artistic applications where living plants provide both decoration and functional <a href="https://www.earth.com/news/bioluminescent-plants-gene-discovery-now-available-for-any-home/">illumination</a>.



“I just find it incredible that an entirely human-made, micro-scale material can come together so seamlessly with the natural structure of a plant,” said Liu. “The way they integrate is almost magical. It creates a special kind of functionality.”



The study is published in the journal <a href="https://www.cell.com/matter/fulltext/S2590-2385(25)00413-8" target="_blank" rel="noreferrer noopener">Matter</a>.



Image Credit: Liu et al., Matter



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Glowing plants could replace street lamps in future cities

From glowing mushrooms on forest floors to plankton that light...

Roughly 390 million years ago, the ancient seas witnessed a dramatic change. Marine animals began moving into deeper waters that had long been uninhabitable. New research suggests this expansion was fueled by a lasting rise in deep-ocean oxygen. 



The source of that oxygen traces back to the spread of woody plants on land, the earliest forests on Earth. This environmental shift coincided with an explosion of new species, especially jawed fish. 



These fish became the ancestors of nearly all <a href="https://www.earth.com/news/greenland-sharks-survive-for-centuries-in-icy-waters/">vertebrates</a> alive today. The link between oxygen levels and evolutionary diversification offers fresh insight into how life reshaped the oceans.



<h2 class="wp-block-heading" id="h-oxygen-rise-shaped-evolution">Oxygen rise shaped evolution</h2>



“It’s known that oxygen is a necessary condition for animal evolution, but the extent to which it is the sufficient condition that can explain trends in animal diversification has been difficult to pin down,” said co-lead author Michael Kipp, assistant professor at <a href="https://duke.edu" target="_blank" rel="noreferrer noopener">Duke University</a>.



“This study gives a strong vote that oxygen dictated the timing of early animal evolution, at least for the appearance of jawed vertebrates in deep-ocean habitats.”



For decades, scientists believed deep-ocean oxygenation occurred only once, at the start of the Paleozoic Era about 540 million years ago. 



Later evidence pointed instead to multiple phases. First, shallower waters became livable for breathing organisms, and only later did oxygen reach deeper environments.



<h2 class="wp-block-heading" id="h-rocks-reveal-ocean-oxygen-history">Rocks reveal ocean oxygen history</h2>



Kipp and his colleagues focused on timing by studying sedimentary rocks once buried beneath ancient oceans. 



They measured levels of selenium, an element that records traces of oxygen in the environment. Selenium occurs in different isotopes, and their ratios reveal whether <a href="https://www.earth.com/news/sea-levels-are-rising-as-predicted-with-bigger-risks-ahead/">oxygen</a> levels were high enough to support animal life.



The team collected 97 rock samples dating from 252 to 541 million years ago, gathered from five continents. 



At the time, these sites lay along outer continental shelves, the zones where land tapered into the ocean before plunging steeply downward. By analyzing isotope ratios in the samples, the researchers tracked oxygen’s reach through time.



<h2 class="wp-block-heading" id="h-two-deep-sea-oxygen-waves">Two deep-sea oxygen waves</h2>



Results showed two distinct deep-ocean oxygenation events. One brief episode occurred during the Cambrian period, about 540 million years ago. 



The second began during the Middle Devonian, around 393 to 382 million years ago, and continues today. Between these events, oxygen dropped to inhospitable levels for most animals.



“The selenium data tell us that the second oxygenation event was permanent. It began in the Middle Devonian and persisted in our younger rock samples,” said co-lead author Kunmanee “Mac” Bubphamanee, a Ph.D. candidate at the <a href="https://www.washington.edu" target="_blank" rel="noreferrer noopener">University of Washington</a>.



<h2 class="wp-block-heading" id="h-vertebrates-thrived-with-more-oxygen">Vertebrates thrived with more oxygen</h2>



The Middle Devonian oxygen rise triggered what scientists call the “mid-Paleozoic marine revolution.” With oxygen now plentiful, <a href="https://www.earth.com/news/ancient-fish-had-flexible-joints-like-humans/">jawed fish</a> and other animals expanded into deeper waters and diversified. 



Fossil evidence also shows that many species grew larger, likely supported by the richer oxygen supply. One example is shown in the featured image of this article - a prehistoric jawed fish from the Late Devonian called <a href="https://www.earth.com/wp-content/uploads/2025/08/Dunkleosteus_prehistoric-fish_deep-ocean-oxygen_N-Tamura_1m.jpg">Dunkleosteus</a>.



This geological shift aligned with another event on land: the spread of woody plants. 



“Our thinking is that, as these woody plants increased in number, they released more oxygen into the air, which led to more oxygen in deeper ocean environments,” Kipp said.



<h2 class="wp-block-heading" id="h-first-oxygen-wave-faded-fast">First oxygen wave faded fast</h2>



The earlier <a href="https://www.earth.com/news/cambrian-explosion-fossils-push-back-the-rise-of-complex-life/">Cambrian</a> oxygen surge remains puzzling. Its decline likely prevented animals from permanently establishing themselves in deeper waters at that time.



“What seems clear is that the drop in oxygen after that initial pulse hindered the spread and diversification of marine animals into those deeper environments of the outer continental shelves,” Kipp noted.



<h2 class="wp-block-heading" id="h-oxygen-history-warns-about-today-s-oceans">Oxygen history warns about today’s oceans</h2>



Although the study looks far into the past, its message carries urgency now. 



“Today, there’s abundant ocean oxygen in equilibrium with the atmosphere," said Kipp. "But in some locations, ocean oxygen can drop to undetectable levels."



"Some of these zones occur through natural processes. But in many cases, they’re driven by nutrients draining off continents from <a href="https://www.earth.com/news/wildlife-may-be-the-answer-to-dwindling-fertilizer-ingredient/">fertilizers</a> and industrial activity that fuel plankton blooms that suck up oxygen when they decay.”



“This work shows very clearly the link between oxygen and animal life in the ocean. This was a balance struck about 400 million years ago, and it would be a shame to disrupt it today in a matter of decades.”



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Featured image: An artist’s rendering of a prehistoric jawed fish from the Late Devonian called Dunkleosteus. These sorts of large, active vertebrates evolved shortly after the deep ocean became well-oxygenated. Credit: 2008 N. Tamura/CC-BY-SA



The study is published in the journal <a href="https://www.pnas.org/doi/10.1073/pnas.2501342122" target="_blank" rel="noreferrer noopener">Proceedings of the National Academy of Sciences</a>.



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Ancient forests pumped oxygen into the ocean and helped deep-sea fish thrive

Roughly 390 million years ago, the ancient seas witnessed a...

Wildfire headlines can feel all over the place. One summer brings walls of flames putting millions of people in danger. The next brings lots of fires, but very few near humans. This is called the "wildfire paradox." 



Here’s the twist: the planet has actually seen less land burned in recent years, yet more people are ending up in the path of flames.



From 2002 to 2021, the total area that burned worldwide went down by about a quarter. 



Over the same years, the number of people directly exposed to wildfires - meaning flames reached the places where they live - went up by roughly 40%. Those two facts sit side by side. They also change how we think about risk.



The "wildfire paradox" term fits. The land is burning less, but exposure is rising because more homes and towns now sit where fires naturally occur. That shift is not random. It grows out of how and where people build.



<h2 class="wp-block-heading" id="h-africa-carries-the-weight">Africa carries the weight</h2>



Across that same period from 2002 to 2021, the authors estimate that about 440 million people experienced a wildfire reaching their community. 



Year to year, exposure climbed by several hundred thousand people annually on average, even as total burned acreage fell. Fewer acres does not automatically mean fewer people in danger.



Most news stories highlight wildfires in <a href="https://www.earth.com/news/dry-lightning-sparks-the-most-destructive-california-wildfires/">California</a>, Greece, or Australia. Yet wildfires in these places account for less than 2.5 percent of all exposures. Africa, often missing from headlines, saw 85 percent of them.



Just five countries - Congo, South Sudan, Mozambique, Zambia, and Angola - accounted for about half of the global total. 



The United States, Europe, and Australia combined made up less than 2.5%. That contrast says more about population patterns and fire frequency than media attention.



“We are surprised by the disproportionate impacts of wildfires on humans in Africa," said Dr. Mojtaba Sadegh, Climate and Wildfire Analytics Lead at <a href="https://unu.edu/inweh" target="_blank" rel="noreferrer noopener">UNU-INWEH</a>.



"We knew that around 65 percent of global burned area occurs there, but their 85 percent share of human exposure shows a pronounced impact that deserves more attention.”



Farming plays a big role. Fields break up grasslands and stop large fires from spreading. But they also bring villages and farms closer to the flames.



<h2 class="wp-block-heading" id="h-wildfire-paradox-and-climate-change">Wildfire paradox and climate change</h2>



<a href="https://www.earth.com/news/climate-change-is-making-wildfire-smoke-more-deadly/">Climate change</a> is amplifying fire danger. Since 1979, extreme fire weather jumped by more than 54 percent. Fire seasons now stretch longer. Nights, once safer, often stay hot and dry enough for fires to keep burning.



Still, the story changes depending on where you look. Africa shows smaller fires but far more people exposed. 



In North and South America, invasive plants help fires grow larger. Europe tries to suppress fires, yet expanding settlements keep raising the risks.



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2025/08/human-wildlife-exposure_growing-globally_map_ScienceJ_1m.jpg"><img src="https://www.earth.com/wp-content/uploads/2025/08/human-wildlife-exposure_growing-globally_map_ScienceJ_1s.webp" alt="Human exposure to wildland fires from 2002 to 2021. (A and C) Cumulative human exposure to wildland fires (A) and cumulative burned area (C) from 2002 to 2021 at the country level. (B and D) Share of continents in wildland fire exposure (B) and burned areas (D). (E and F) Percentage of population exposed to wildland fire from 2002 to 2021 in each country (E) and continent (F). K, one thousand; M, one million. Credit: Science Advisor" class="wp-image-1983464"/></a><figcaption class="wp-element-caption">Human exposure to wildland fires from 2002 to 2021. (A and C) Cumulative human exposure to wildland fires (A) and cumulative burned area (C) from 2002 to 2021 at the country level. (B and D) Share of continents in wildland fire exposure (B) and burned areas (D). (E and F) Percentage of population exposed to wildland fire from 2002 to 2021 in each country (E) and continent (F). K, one thousand; M, one million. Click image to enlarge. Credit: Science Advisor</figcaption></figure>



<h2 class="wp-block-heading" id="h-human-actions-reshape-fire-risks">Human actions reshape fire risks</h2>



Study co-author Professor Amir AghaKouchak noted that while the human exposure to fires is rising, the team saw that burned land is shrinking by 26 percent.



“In Africa, farming has broken up large <a href="https://www.earth.com/news/grasslands-are-racing-to-adapt-to-climate-shifts/">grasslands</a> into smaller fields, which stops fires from spreading as widely but also puts more villages and farms closer to fire-prone land."



"In the Americas, invasive plants have fueled bigger and more frequent wildfires, showing how human actions can change fire risks in very different ways.”



The numbers back this up. Nearly half of the world’s people now live in the wildland–urban interface, an area covering less than 5 percent of Earth’s surface.



The study shows that population growth and migration explain about a quarter of all exposures. Without these changes, exposure levels would have fallen alongside shrinking burned area.



Instead, exposure density nearly doubled. In plain terms, more people are living inside or right next to land that burns.



<h2 class="wp-block-heading" id="h-beyond-burned-land">Beyond burned land</h2>



Focusing only on how much land burns hides the real danger. Intense fires make up just 0.01 percent of all events, but they exposed 2.7 million people and burned 5 percent of the total land in the study. 



Regions like Western North America, Southern Europe, and Southern Australia faced far more human loss than their share of exposures suggested.



“Wildfires are no longer seasonal or regional anomalies; they have become a global crisis, intensified by rising <a href="https://www.earth.com/news/climate-change-has-made-heatwaves-more-deadly/">heatwaves</a>, worsening droughts, and drastic land use changes,” said Professor Kaveh Madani, Director of UNU-INWEH.



“But instead of stepping up to confront this threat, some of the world’s biggest economies are rolling back protections, leaving vulnerable regions and communities to shoulder the heaviest burden."



<h2 class="wp-block-heading" id="h-the-wildfire-paradox-needs-solutions">The wildfire paradox needs solutions</h2>



The study warns that measuring only burned land misses the true danger of wildfires. What matters most is how close people live to fire-prone areas. As populations expand into these zones, exposure to wildfires rises even if less land burns.



The authors stress the need for stronger<a href="https://www.earth.com/news/fire-suppression-methods-increase-the-severity-of-wildfires/"> fire management</a> and strategies tailored to local conditions. Communities require infrastructure designed to withstand fire, along with better preparedness. 



At the same time, global climate action is essential to slow the worsening of extreme fire weather. Without these combined efforts, more lives will remain directly in the path of devastating wildfires.



The study is published in the journal <a href="https://www.science.org/doi/10.1126/science.adu6408" target="_blank" rel="noreferrer noopener">Science</a>.



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"Wildfire paradox" tries to explain why fires are raging across the entire planet

Wildfire headlines can feel all over the place. One summer...

In crowded cities, leafy streets can lift a neighborhood’s appeal - and its home values. But a new analysis finds the boost depends on where those trees are. Nearby canopy that cools sidewalks and frames streetscapes tends to raise prices. 



Trees planted on the lot itself can sometimes do the opposite once maintenance, root damage, and storm risks are factored in.



The study was led by researchers from the <a href="https://pamplin.vt.edu/" target="_blank" rel="noreferrer noopener">Pamplin College of Business</a>, working with the <a href="https://www.fs.usda.gov/" target="_blank" rel="noreferrer noopener">U.S. Forest Service</a>.



The team stitched together multiple data sets - including Environmental Protection Agency records - across nine U.S. metropolitan areas to map how tree cover at different distances relates to sale prices.



<h2 class="wp-block-heading" id="h-where-trees-grow-values-follow">Where trees grow, values follow</h2>



The team broke urban greenery into rings around each property: within 330 feet (about a city block), from 330 feet to one-third of a mile, and from one-third to two-thirds of a mile. 



The researchers then estimated how much added canopy in each ring correlated with a change in value, controlling for local market conditions.



“While tree cover supports owners' property values, their tree cover benefits the greater community property values,” said co-author Kevin Boyle, a professor in the <a href="https://realestate.vt.edu/" target="_blank" rel="noreferrer noopener">Blackwood Department of Real Estate</a>.



That distinction - private trees versus neighborhood trees - runs through the results. Shade you can walk under and scenery you drive past appear to deliver broad benefits that the market recognizes. 



On-site trees, by contrast, carry highly localized costs and risks that can dampen the net effect for the individual owner.



<h2 class="wp-block-heading" id="h-a-tale-of-two-cities"><a></a>A tale of two cities</h2>



The effect differs widely by location, with Fresno, California, at the lowest end and Milwaukee, Wisconsin, at the highest.



In Fresno, tree cover adds about $9 to a home’s value - essentially a rounding error. Adding 10 percent more <a href="https://www.earth.com/news/laser-technology-measures-forest-canopy-height-from-space/">canopy</a> on or near the lot, and Fresno values dip by roughly $114 (around 0.1%). This reflects perceived costs such as upkeep, insurance, or interference with structures and utilities.



Shift that same extra canopy outward - between one-third and two-thirds of a mile - and the home’s value rises by about $6,751 (roughly 3.2%).



Milwaukee tells the opposite story. There, the same baseline tree cover near a property adds roughly $3,500. A 10 percent increase in canopy within 330 feet is associated with a jump of about $39,701 (around 24 percent).



Even at a distance - one-third to two-thirds of a mile - extra canopy correlates with another $27,194 (about 16 percent) in value. The Milwaukee case underscores how neighborhood-level trees can powerfully shape perceived livability in some markets.



<h2 class="wp-block-heading" id="h-neighborhood-trees-pay-off">Neighborhood trees pay off</h2>



The researchers argue the market is pricing two different bundles of attributes. Neighborhood canopy offers shared goods: cooler microclimates during <a href="https://www.earth.com/news/climate-change-has-made-heatwaves-more-deadly/">heat waves</a> and calmer streetscapes. It also provides a cohesive look that signals care and stability.



Homebuyers will pay for those amenities even if they’re not responsible for pruning the branches that provide them. 



On-lot trees can still be assets, especially when well sited and maintained. But buyers often discount for future costs - leaf litter, gutter clogs, sidewalk heaves, power-line conflicts, <a href="https://www.earth.com/news/how-soil-moisture-can-predict-severe-storms/">storm</a> damage, or insurance implications.



The analysis also acknowledges weather realities. Trees can fall in severe winds or ice storms and increase damage risk. They also cut urban heat, manage stormwater, and improve air quality at block and district scales.



The net economic signal depends on which set of experiences dominates in a given city and how residents value shared versus private benefits.



<h2 class="wp-block-heading" id="h-private-yards-public-benefits">Private yards, public benefits</h2>



Most urban land is privately owned, which complicates efforts to grow and maintain the “green infrastructure” that benefits entire neighborhoods. 



The authors suggest local leaders consider incentives - <a href="https://www.earth.com/news/planting-trees-is-important-but-reforestation-can-help-too/">planting programs</a>, maintenance support, or right-of-way investments - that nudge canopy growth into the rings where it delivers the biggest bang for the buck.



“Our analysis can be used by community leaders to understand the benefits of tree coverage,” Boyle said. “It can also educate community members that their actions in support of tree coverage can help not only the greater community, but themselves through enhanced property values.”



That strategy could include prioritizing street trees and park expansions within walking distance of homes, where the study finds the strongest and most consistent price effects.



It could also mean offering technical help to homeowners for site-appropriate species selection and root-friendly planting plans that minimize future conflicts with foundations, sidewalks, and utilities.



<h2 class="wp-block-heading" id="h-action-steps-for-greener-cities">Action steps for greener cities</h2>



For owners, the takeaway is practical: trees can add value, but placement, species, and care matter. A well-chosen street-facing canopy that shades façades and sidewalks can enhance curb appeal and comfort. 



In backyards, opt for species with less <a href="https://www.earth.com/news/diverse-forests-can-shut-down-non-native-tree-invasions/">invasive</a> roots and maintain clearances around roofs and lines.



For cities, the findings argue for shifting some canopy growth off private lots and into shared corridors - streets, medians, easements, and pocket parks. They also highlight the need for maintenance budgets that keep those trees healthy and safe.



Doing so aligns who pays with who benefits, reducing the friction that can arise when the public asks private owners to shoulder the costs of a public good.



<h2 class="wp-block-heading" id="h-greener-neighborhoods-higher-values">Greener neighborhoods, higher values</h2>



The headline is simple: trees can lift home values in cities. The fine print is where the policy levers lie. Market signals in Fresno differ from Milwaukee, and the effects of canopy on the lot differ from canopy down the block.



By parsing those patterns across thousands of blocks in nine metropolitan areas, the study gives planners, assessors, and residents a clearer map. 



Plant where the benefits compound, support owners where responsibilities fall, and grow the shared canopy that keeps neighborhoods cooler, calmer, and more valuable.



The study is published in the journal <a href="https://www.sciencedirect.com/science/article/abs/pii/S0921800925001922?via%3Dihub">Ecological Economics</a>.



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How neighborhood trees can raise - or sink - your property value

In crowded cities, leafy streets can lift a neighborhood’s appeal...

When you toss food waste into the trash, it might seem like no big deal. After all, it’s organic - it’ll break down eventually, right? 



But what actually happens to that waste after it’s hauled away is a much bigger issue than most people realize. And it’s not just about overcrowded landfills - it’s about methane.



Food waste buried in a landfill doesn’t simply rot and disappear. It releases <a href="https://www.earth.com/news/top-10-global-methane-emissions-hotspots-spotted-by-satellites/">methane</a>, a greenhouse gas that’s 80 to 85 times more powerful than <a href="https://www.earth.com/news/how-carbon-dioxide-travels-in-the-atmosphere/">carbon dioxide</a> over a 20-year period. 



This makes food waste a serious player in climate change - not because of how much we toss, but because of where it ends up and how it breaks down.



<h2 class="wp-block-heading" id="h-landfills-turn-food-waste-into-methane">Landfills turn food waste into methane</h2>



Here’s the issue: <a href="https://www.earth.com/news/landfills-emit-exorbitant-amount-methane-into-atmosphere/">landfills</a> aren't built to help food break down cleanly. When food waste ends up buried under other trash, it quickly uses up the oxygen in its immediate surroundings. 



At first, some decomposition happens with oxygen, which releases carbon dioxide - still a greenhouse gas, but not nearly as potent.



But once the oxygen's gone, the process switches. Now you’ve got anaerobic decomposition, which happens without oxygen. This is where methane starts building up. 



And unlike compost piles, which stay exposed to air and rely on oxygen, landfills are packed tight. That makes them perfect methane factories.



<h2 class="wp-block-heading" id="h-composting-transforms-food-waste">Composting transforms food waste</h2>



<a href="https://www.earth.com/news/food-waste-crisis-why-u-s-goals-remain-out-of-reach/">Composting</a> does the exact opposite. It keeps oxygen in the mix throughout the process. That means no methane. Plus, it turns food scraps into something useful: a natural fertilizer that can go back into farms and gardens.



Some cities, especially in recent years, have started composting programs to cut down on landfill methane. But how effective are these programs? Do they really work?



One recent study examined how composting plays out in real life, based on actual data. The study concentrated on places such as Austin, Texas, where there are programs set up to allow people to compost at home. 



On average, the program reduced organic waste output by roughly 2.3 pounds per household per week. That’s a good start, but it’s only about 30% of what a typical American household discards a week.



<h2 class="wp-block-heading" id="h-composting-requires-individual-effort">Composting requires individual effort</h2>



There’s also the question of participation. Unlike cities such as San Francisco, many places don’t enforce composting. That means it’s optional - and a lot of people skip it.



Jackson Somers is an assistant professor of&nbsp;agricultural and resource economics&nbsp;in the College of Agriculture, Health and Natural Resources (<a href="https://cahnr.uconn.edu/">CAHNR</a>).



“As individuals, we produce a lot of food waste, and it’s something we should be cognizant of. From there, you should compost if you want to compost,” said Somers. 



"I think, inherently, we don’t want to be wasteful. But for some people it’s just a high burden of effort.”



<h2 class="wp-block-heading" id="h-composting-isn-t-cheap-yet">Composting isn’t cheap - yet</h2>



Even with some success, the economics are tricky. According to Somers’ analysis, it currently costs about $478 to avoid emitting one ton of CO2 through composting programs. 



By comparison, the “social cost of carbon” - a number economists use to estimate the damage caused by each ton of <a href="https://www.earth.com/news/circular-economy-needed-to-reduce-americas-carbon-emissions/">carbon emissions</a> - is set at $51.



That means composting, at least in small-scale residential programs with low participation, isn’t cheap when measured in dollars.



“With current programs, given the infrastructure we have - these programs are really expensive for the savings we see,” Somers said. But that doesn’t make composting a lost cause.



<h2 class="wp-block-heading" id="h-short-term-cost-long-term-gain">Short-term cost, long-term gain</h2>



The cost of building new landfills is rising fast. Once current landfills are full, finding and building new ones will be a big financial burden for many cities. So building composting infrastructure now might save money down the road.



Also, the social cost of carbon isn’t fixed. As scientists understand more about climate change, the estimated damage from each ton of carbon goes up. That means composting could become more cost-effective over time - even if the upfront price is high.



“As we learn more about our impact, composting programs may become cheaper from an environmental sense,” Somers said.



The study focused on households, but Somers pointed out that restaurants, grocery stores, and other businesses throw away massive amounts of organic waste. That’s where composting could really move the needle.



“That’s where I think you can see real savings. I think that’s something we should consider more than we do," said Somers. 



<h2 class="wp-block-heading" id="h-unexpected-benefits-of-composting">Unexpected benefits of composting </h2>



Composting might also bring unexpected benefits. Large cities with lots of exposed food waste deal with more mess and public health concerns. Composting can help reduce that and keep neighborhoods cleaner.



“Keeping <a href="https://www.earth.com/news/rats-are-spreading-a-deadly-disease-across-cities/">rats</a> and other pests out of neighborhoods certainly goes into the calculus too,” Somers said. 



“How many people get sick from rats? How much do we dislike seeing rats running around on the streets? It’s important to factor in other impacts, not just environmental.”



<h2 class="wp-block-heading" id="h-no-universal-fix-for-food-waste">No universal fix for food waste</h2>



Different communities need different solutions. Demographics, geography, and even local habits all shape what works best.



In some Connecticut cities, compost bins are picked up curbside. In others, residents drop off food scraps at centralized locations. 



“A one-size-fits-all solution is not the answer,” Somers said. “The solution in northwestern Connecticut is very different from the solution in Stamford or Hartford - and the solutions for Stamford and Hartford are also going to be different because demographically they’re quite different.”



The full study was published in the journal <a href="https://www.sciencedirect.com/science/article/abs/pii/S0095069625000580?via%3Dihub">Journal of Environmental Economics and Management</a>.



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Food waste is a growing climate threat - can composting help?

When you toss food waste into the trash, it might...

Plants appear still, yet inside they are alive with communication. They must continuously balance how to capture energy without losing too much water. For decades, scientists suspected there were internal messengers guiding this process, but the exact molecules remained unidentified.



A new study led by <a href="https://www.psu.edu" target="_blank" rel="noreferrer noopener">Penn State</a> researchers finally reveals the nature of these signals. This work not only solves a long-standing mystery but also suggests new directions for <a href="https://www.earth.com/news/scientists-finally-learn-what-makes-plants-roots-grow-faster-and-stronger-autophagy/">agriculture</a> and plant resilience research.



<h2 class="wp-block-heading" id="h-how-plants-balance-food-and-water">How plants balance food and water</h2>



“This discovery significantly advances our understanding of how plants coordinate their internal metabolism - the chemical reactions they use to make energy - with their external environment, a fundamental process for plant growth and survival,” said Professor Sarah Assmann. 



“Our findings open doors for future research into improving <a href="https://www.earth.com/news/how-future-climate-conditions-will-transform-plant-growth/">plant</a> resilience and crop yields.”



Guard cells, located on the leaf surface, control stomata, the tiny pores that regulate the intake of carbon dioxide and the release of water vapor. 



These pores act like microscopic mouths. When they open, plants can “eat” by absorbing CO2, but they risk losing vital water at the same time.



<h2 class="wp-block-heading" id="h-mysterious-plant-messengers">Mysterious plant messengers</h2>



“There is always a tradeoff for terrestrial plants between maximizing CO2 intake, which is needed for photosynthesis, and letting out water vapor, which can dry out the plant and ultimately kill it if it loses too much water,” explained Professor Assmann.



“The stomata are the pores where that tradeoff takes place. When they open, they let in CO2 that allows the plant to feed, but they also let out water vapor, which dehydrates the plant. We knew there had to be some kind of messenger telling the guard cells how to regulate that life-or-death decision.”



The new findings show that sugars, including sucrose, glucose, and fructose, as well as maleic acid, act as these critical messengers. These metabolites form a feedback loop, linking the <a href="https://www.earth.com/news/plants-grow-longer-in-cities-due-to-artificial-light/">plant</a>’s energy production to its stomatal control.



<h2 class="wp-block-heading" id="h-tracking-signals-in-plant-leaves">Tracking signals in plant leaves</h2>



The researchers worked with the model plant Arabidopsis thaliana, or thale cress, and fava beans to uncover the energy production system in plants. 



By extracting apoplastic fluid from leaves exposed to either red light or darkness, they were able to isolate chemical compounds. Red light stimulates photosynthesis, making it easier to detect active signals.



Through this process, the team identified 448 chemical compounds in the fluid. “We identified hundreds of metabolites in apoplastic fluid, which no one had analyzed to this extent before,” noted Professor Assmann.



“That, on its own, is an important contribution to the field, independent of the research question that we specifically were addressing, because it gives a lot of leads on other potential signaling molecules for processes throughout the plant.”



<h2 class="wp-block-heading" id="h-sugars-control-plants-water-use">Sugars control plants water use</h2>



Further experiments revealed sugars directly promoted stomatal opening under red light. When tested in intact leaves, these compounds increased carbon dioxide uptake and also altered water release, confirming their messenger role.



Cell-level experiments explained the mechanism: sugars stimulate molecular machinery inside guard cells, activating them to open the stomata. 



This research provides the first full picture of the internal dialogue between photosynthesis and water regulation.



<h2 class="wp-block-heading" id="h-studying-what-makes-plants-resilient">Studying what makes plants resilient</h2>



The Nature Plants study also emphasizes that stomatal control does not rely solely on hormones, as once thought. Instead, metabolic products themselves can serve as powerful signaling agents. 



This finding adds a new dimension to how scientists view plant-environment interactions. According to Professor Assmann, the team is focused on understanding how plants sense and respond to environmental <a href="https://www.earth.com/news/plant-roots-could-be-key-to-fighting-climate-change/">conditions</a>. 



“Plants can’t uproot themselves and find somewhere else to live; they have to deal with whatever the environment throws at them - increasingly drought and heat stress," she noted. 



"So we study what makes plants resilient, from the very specific molecular level all the way up to whole plant physiology and field experiments, with the goal of improving crop productivity.”



The project brought together researchers from Penn State, <a href="https://en.huji.ac.il/" target="_blank" rel="noreferrer noopener">The Hebrew University of Jerusalem</a>, Nagoya University, RIKEN Center for Sustainable Resource Science, and the University of Mississippi. 



The research was funded, in part, by the <a href="https://www.nsf.gov/" target="_blank" rel="noreferrer noopener">National Science Foundation</a>.



The study is published in the journal <a href="https://www.nature.com/articles/s41477-025-02078-7" target="_blank" rel="noreferrer noopener">Nature Plants</a>.



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Hidden messengers tell plants when to eat and breathe

Plants appear still, yet inside they are alive with communication....

Rice feeds billions. It thrives in warm, wet fields and stores energy in a way that fits busy lives and tight budgets. Those same flooded fields can also make arsenic more available to rice plants, and some of that arsenic can end up in the grain.



A growing body of field evidence points to a new twist: <a href="https://www.earth.com/news/astonishing-global-heat-in-january-2025-defied-climate-expectations/">as the planet warms</a> and CO₂ rises, flooded soils lose oxygen more often and for longer stretches. That chemical shift frees arsenic from soil particles, and rice roots take up more of it.



<h2 class="wp-block-heading" id="h-climate-rice-and-arsenic">Climate, rice, and arsenic</h2>



After years of outdoor trials, researchers report that <a href="https://www.earth.com/news/world-water-day-2025-preserving-glaciers-protecting-our-future/">climate conditions</a> expected by mid-century would increase the flow of inorganic arsenic - the harmful form - from soil to plant to grain.



The work appears in a leading medical journal and was conducted by teams at Columbia University’s <a href="https://www.publichealth.columbia.edu/" target="_blank" rel="noreferrer noopener">Mailman School of Public Health</a>, with collaborators in China and the United States. 



“Our results suggest that this increase in arsenic levels could significantly elevate the incidence of heart disease, diabetes, and other non-cancer health effects,” explained <a href="https://www.publichealth.columbia.edu/profile/lewis-ziska" target="_blank" rel="noreferrer noopener">Dr. Lewis Ziska</a>, associate professor of Environmental Health Sciences at the Columbia Mailman School.



<h2 class="wp-block-heading" id="h-why-arsenic-is-in-rice">Why arsenic is in rice</h2>



Arsenic occurs naturally in many soils and waters. In paddies that stay flooded, oxygen dwindles. Iron minerals that normally bind arsenic dissolve, and arsenic becomes more mobile. 



Warmer conditions paired with higher CO₂ push that chemistry along, especially in fields that remain waterlogged. 



Under future settings - temperatures <a href="https://climate.mit.edu/ask-mit/why-did-ipcc-choose-2deg-c-goal-limiting-global-warming" target="_blank" rel="noreferrer noopener">more than 2°C</a> (about 3.6°F) above pre-industrial levels plus elevated CO₂ - the balance tilts toward more inorganic arsenic entering the plant.



That does not make every bowl risky. Local geology, irrigation sources, soil type, and farming practices all shape grain levels. It does mean that the odds can shift in places where paddies stay saturated for long periods.



<h2 class="wp-block-heading" id="h-studying-rice-and-arsenic">Studying rice and arsenic</h2>



The scientists did not rely on short greenhouse trials. They grew 28 rice varieties outdoors for roughly a decade using a Free-Air CO₂ Enrichment (<a href="https://ess.science.energy.gov/face/" target="_blank" rel="noreferrer noopener">FACE</a>) system.



This process releases extra CO₂ around crops in the open air so that sunlight, wind, microbes, and soil behave as they do in real life.



Those long-running field data then fed into models linking plant arsenic levels to typical rice intake and body size across major <a href="https://www.earth.com/news/feeding-the-world-without-harming-nature-the-complex-balance-of-farming/">rice-eating countries</a> in Asia.



The projections indicate a sizable shift in risk. Lifetime cancer risks, particularly for lung and bladder cancer, increased by 44% relative to ambient conditions. China alone may face 19.3 million excess cancer cases related to arsenic exposure through rice. 



“From a health perspective, the toxicological effects of chronic iAs exposure are well established; and include cancers of the lung, bladder, and skin, as well as ischemic <a href="https://www.earth.com/news/heart-disease-kills-differently-now-than-five-decades-ago/">heart disease</a>,” said Dr. Ziska.



Non-cancer outcomes also matter. The modeling points to increased risks for cardiovascular and metabolic diseases tied to long-term inorganic arsenic exposure in populations with high rice intake.



<h2 class="wp-block-heading" id="h-where-risks-are-the-highest">Where risks are the highest</h2>



Diet and water sources shape exposure. Regions where rice is a daily staple and paddies are often kept flooded will see the largest impacts under warmer, CO₂-richer conditions. 



“Ingesting rice in regions like southern China and Southeast and South Asia is already a significant source of dietary arsenic and cancer risk,” said Dr. Ziska.



Within countries, irrigation that draws from arsenic-rich groundwater can raise grain levels. Varieties also differ in how strongly they transport arsenic from roots to grain, which creates room for practical solutions.



<h2 class="wp-block-heading" id="h-this-is-bad-what-can-be-done">This is bad, what can be done?</h2>



<a href="https://www.earth.com/news/genetic-fixes-may-save-crops-from-climate-stress/">Plant breeding</a> can help: select and develop varieties that limit arsenic uptake even when soils push it toward the roots. Breeders already see large differences among rice lines in how much arsenic reaches the grain. 



<a href="https://www.earth.com/news/trillions-of-cubic-meters-of-water-is-used-to-grow-crops-each-year/">Water management</a> is another lever. Continuous flooding increases arsenic mobility, while giving soils time to drain lets oxygen return, which can hold arsenic in less available forms.



Post-harvest steps matter too. Milling and cooking methods can reduce how much arsenic ends up on the plate. 



No single fix works everywhere. Shifting water regimes, for example, can raise cadmium in some settings, so local testing and tailored management are essential to avoid trading one problem for another.



<h2 class="wp-block-heading" id="h-limits-and-moving-parts">Limits and moving parts</h2>



Any mid-century projection carries uncertainty. Policies can bend emissions paths, and farmers adapt as technology and economics shift. 



Diets change with income, urbanization, and migration. The underlying processes are well established. The decade of fieldwork done for this study adds weight because it includes real weather, pests, and <a href="https://www.earth.com/news/engineered-plant-microbiomes-the-future-of-crop-protection/">microbial communities</a>.



<h2 class="wp-block-heading" id="h-rice-arsenic-and-human-health">Rice, arsenic, and human health</h2>



Rice remains a staple food, and the findings from this research don't claim that every bowl on every table becomes unsafe. Instead, the scientists point to smarter ways of managing risk and a need to act upstream.



Farmers can adjust irrigation where feasible. Breeders can favor varieties that move less arsenic to the grain. Public health agencies can track arsenic in grains and irrigation sources to guide choices in hotspots. 



“Our study underscores the urgent need for action to reduce arsenic exposure in rice, especially as climate change continues to affect <a href="https://www.nifa.usda.gov/topics/global-food-security" target="_blank" rel="noreferrer noopener">global food security</a>,” said Dr. Ziska.



Keeping rice safe in a warming world is within reach: breed smarter, water smarter, process smarter—and cut emissions, because the air over our fields follows us to the table.



The full study was published in the journal <a href="https://www.thelancet.com/journals/lanplh/article/PIIS2542-5196(25)00055-5/fulltext" target="_blank" rel="noreferrer noopener">The Lancet Planetary Health</a>.



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Scientists warn a very deadly poison is accumulating in global rice fields

Rice feeds billions. It thrives in warm, wet fields and...

Industrial tomato plants, grown for their juicy fruits used in sauce and paste, face a hard new normal in northern Italy. <a href="https://www.earth.com/news/deadly-heat-waves-in-europe-can-be-predicted-by-melting-sea-ice/">Summers run hotter</a>, rain arrives at the wrong time, and water is under pressure almost everywhere.



“Currently, agriculture accounts for 70 percent of global freshwater withdrawals, and more than 90 percent of its consumptive use,” stated the Food and Agriculture Organization (<a href="https://www.fao.org/4/i3015e/i3015e.pdf" target="_blank" rel="noreferrer noopener">FAO</a>) of the United Nations.



A new field study from the Po Valley tested a simple irrigation tweak that saved water while keeping yields steady and improving fruit quality. 



The work compared full-season irrigation with regulated deficit irrigation in 2019 near Parma and in 2022 near Piacenza, and the authors reported less water use, stable tonnage, and better processing traits.



<h2 class="wp-block-heading" id="h-regulated-deficit-irrigation">Regulated deficit irrigation</h2>



<a href="https://www.earth.com/news/thirstwaves-the-hidden-climate-threat-drying-out-american-farms/">Evapotranspiration</a> is the combined water loss from plant <a href="https://www.earth.com/news/tomato-plants-talk-to-one-another-to-signal-danger/">leaves and soil</a>, and conventional irrigation tries to replace it exactly through the season. 



Regulated deficit irrigation intentionally withholds part of that water during growth stages known to be less sensitive, which can rein in usage without hurting yield. 



According to a recent <a href="https://academic.oup.com/jxb/article/58/2/147/534071" target="_blank" rel="noreferrer noopener">study</a>, deficit irrigation, defined as the application of water below full crop-water requirements, is an important tool to achieve the goal of reducing irrigation water use.



<h2 class="wp-block-heading" id="h-tomato-plant-growth-traits">Tomato plant growth traits</h2>



The Italian trials gave plants normal water until the tomatoes hit the color break stage, then cut irrigation to 50 percent. 



That single turn of the dial reduced seasonal irrigation volume by about one quarter while holding total and marketable yield steady, and it increased water productivity on a per gallon basis.



The same schedule also lifted two traits that matter to processors, <a href="https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/brix" target="_blank" rel="noreferrer noopener">Brix</a> and dry matter, which both rise when fruit concentrates sugars and solids as <a href="https://www.earth.com/news/ripening-tomatoes-may-hold-clues-to-delay-human-aging/">ripening advances</a>. 



The method, while modest, lines up with a practical aim: produce the same crop with less water and send a denser load to the factory.



<h2 class="wp-block-heading" id="h-why-sweetness-and-solids-improved">Why sweetness and solids improved</h2>



Processors care about soluble solids because more solids mean more paste per truck. 



Extension <a href="https://ucanr.edu/sites/default/files/2016-03/236983.pdf" target="_blank" rel="noreferrer noopener">researchers</a> note that soluble solids, measured as degrees Brix, are directly tied to paste and sauce yield, and inspection stations grade loads on Brix alongside pH and color.



A mild late season water pullback often shifts plant metabolism toward fruit, which can nudge Brix upward and lower pH a touch, both friendly to canning. 



The study’s quality index that blends price with solids rose accordingly, signaling a cleaner economic payoff at delivery.



<h2 class="wp-block-heading" id="h-studying-tomato-plant-health">Studying tomato plant health</h2>



The team did not guess about stress, they watched it from above. <a href="https://earth.esa.int/eogateway/missions/planetscope" target="_blank" rel="noreferrer noopener">PlanetScope satellites</a>, upgraded to eight spectral bands and near daily coverage by 2021, offer 3 meter imagery that can track crop vigor through the season.



They calculated several vegetation indices and looked two weeks before and after the irrigation cut. 



<a href="https://www.earth.com/news/living-green-spaces-boosts-bone-density-reduces-osteoporosis/">NDVI</a>, a common index that flags water stress in tomatoes across soil types, did not show a divergence between treatments, a sign that the reduced watering did not push plants into visible distress.



The takeaway is straightforward. Irrigate normally through fruit set and early sizing, then, at color break, shift to half of the usual replacement and keep that level through harvest.



That timing matters because early water stress can abort flowers or stunt small fruit, while late, controlled stress can concentrate solids without undercutting total tonnage. The Italian data back that timing choice across two soils and two contrasting seasons.



<h2 class="wp-block-heading" id="h-economic-and-environmental-angles">Economic and environmental angles</h2>



On the environmental side, using roughly one quarter less irrigation water immediately eases demand on canals and <a href="https://www.earth.com/news/40-percent-of-earths-land-has-became-permanently-drier/">aquifers</a> in dry months. 



On the farm side, higher solids per load mean fewer gallons boiled off and more paste per hour through the evaporators.



Those gains show up twice, in the water ledger and the balance sheet, without extra equipment or software. 



The approach fits <a href="https://www.earth.com/news/californias-farms-have-a-good-chance-of-navigating-the-water-crisis/">drip systems</a> already in place across processing tomato acres and asks only for a date on the calendar and a new setpoint on the controller.



<h2 class="wp-block-heading" id="h-caveats-worth-noting">Caveats worth noting</h2>



The trials did report a small uptick in certain defects, including more overripe and some blossom end rot, even though sunscald did not rise. 



That pattern suggests managers should watch ripeness closely and plan harvest windows to match the faster finish.



Local soils, seasonal rain timing, and <a href="https://www.earth.com/news/tomatoes-have-a-molecular-trick-to-survive-in-extreme-heat/">heat will shape responses</a>, so the color break trigger is the anchor, not a rigid date. 



Fields with lighter textures or hotter pockets might hit the threshold earlier, and blocks with heavier soils may stretch it a few days.



<h2 class="wp-block-heading" id="h-tomato-plants-matter-worldwide">Tomato plants matter worldwide</h2>



Processing <a href="https://www.earth.com/news/scientists-find-a-surprising-case-of-reverse-evolution-in-wild-tomatoes/">tomatoes</a> are a pillar of food supply chains, from ketchup to pizza sauce, and the Po Valley ranks with California among the world’s top producing regions. 



A method that saves water, keeps yields steady, and delivers denser fruit can help processors and growers share gains along the chain.



Add the larger water picture and the case strengthens. Every gallon not pumped leaves a little more slack for rivers, neighbors, and dry years ahead.



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The research team included Andrea Burato, Pasquale Campi, Alfonso Pentangelo, and Mario Parisi of the CREA Research Centre for <a href="https://www.crea.gov.it/en/web/orticoltura-e-florovivaismo" target="_blank" rel="noreferrer noopener">Vegetable and Ornamental Crops</a> and the CREA Research Centre for <a href="https://www.crea.gov.it/en/web/agricoltura-e-ambiente/" target="_blank" rel="noreferrer noopener">Agriculture and Environment</a>, with collaboration from the <a href="https://portale.unibas.it/site/en/home.html" target="_blank" rel="noreferrer noopener">University of Basilicata</a>.



The study is published in <a href="https://www.mdpi.com/2073-4395/15/8/1805" target="_blank" rel="noreferrer noopener">Agronomy</a>.



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