Of course, carbon dioxide plays a key role in global warming, but among all the greenhouse gases, methane deserves special attention because of its larger global warming potential (28 times higher than carbon dioxide on a 100-year time horizon). Moreover, once in the atmosphere carbon dioxide can continue to affect climate for thousands of years. Methane, by contrast, is mostly removed from the atmosphere by chemical reactions, persisting for about 12 years.
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Source: Phys.org