Savannas and grasslands in arid climates globally are crucial in climate change mitigation by storing substantially more soil carbon than previously understood, according to a new study. These ecosystems help to slow climate warming by serving as valuable carbon sinks. Focus of the study  A team of 20 international researchers analyzed data from 53 fire-manipulation experiments worldwide. "The majority of our sites were from fire-manipulation experiments where fire treatments were prescribed (43 out of 53). The fire frequencies ranged from one fire every 17 years to one fire...