Word: co2
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Dates: during 2010-2019
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...most of the attention when it comes to greenhouse gases, but it's not the only one that's warming the earth. Methane - a gas that is found in everything from landfills to cow stomachs - also plays a big role. Although global methane-emissions levels are much lower than CO2 emissions, pound for pound methane is a more powerful greenhouse gas; a ton of it has 23 times the warming effect of a ton of CO2. And methane, like CO2, is on the rise thanks to us: about 60% of global methane emissions come from man-made sources...
...Separating the factors that contribute to climate change from the things that help reverse it is not always easy because sometimes they're one and the same. Trees sop up CO2, for example, but when they die and decay they release it back into the air. Wetlands and rice paddies serve a similarly dual role for both CO2 and methane, acting as sources and sinks simultaneously. The challenge has been trying to tease out how those two functions balance out, but a new paper in the Jan. 14 issue of Science has provided some hard numbers. Using satellite data, investigators...