Natural tropical wetlands were the main source of a marked rise in global atmospheric methane levels observed during the past few years. After a decade of stability, atmospheric concentrations of the potent greenhouse gas began to climb in 2007. Philippe Bousquet at the French National Centre for Scientific Research in Gif-sur-Yvette, France, and his group used atmospheric chemistry and transport models, along with an ecosystem model of wetland methane emissions, to infer the contributions of natural and anthropogenic sources to the rise.
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