When it comes to global warming, most of us think of carbon dioxide emissions. While carbon dioxide is the most important greenhouse gas, carbon dioxide emissions have stayed constant for the last three years. On the other hand, methane, the second most important gas, has been steadily rising since 2007.

The rapid rise of methane in the atmosphere is a concern that needs urgent attention, according to authors of a study published in Environmental Research Letters. Their analysis suggests that agricultural sources, with contributions from fossil fuel use and possibly wetlands, are responsible… more

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