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Estimating Greenhouse Gas Emissions In US Cities Study maps greenhouse gas emissions to building, street level for U.S. cities project to help overcome barriers to an international climate change treaty. The primary sources of greenhouse gas emissions in the United States are: Transportation.
Greenhouse gases are those that absorb and emit infrared radiation in the wavelength range emitted by Earth. Carbon dioxide (0.04%), nitrous oxide, methane, and ozone are trace gases that account for almost 0.1% of Earth’s atmosphere and have an appreciable greenhouse effect.
A second type of indirect effect happens when chemical reactions in the atmosphere involving these gases change the concentrations of greenhouse gases. The main chemical that reacts with methane in the atmosphere is the hydroxyl radical (OH), thus more methane means that the concentration of OH goes down. Effectively, methane increases its own atmospheric lifetime and therefore its overall radiative effect.
Greenhouse gas emissions from human activities strengthen the greenhouse effect, causing climate change Estimating Greenhouse Gas Emissions In US Cities as shown above also will show how Heat pumps can also reduce greenhouse gas emissions by up to 54% compared to natural gas alternatives, according to a study from the Natural Resources Defense Council.