Unexpected levels of human-caused methane could mean trouble A rise in human-caused methane emissions -- a phrase that certainly does not make us giggle -- has been masked by a decline in natural methane releases, says a new report in Nature. Atmospheric concentrations of methane, less abundant than carbon dioxide but 20 times greenhouse-gassier, have remained relatively stable since 1999. But data from tracking stations around the world show that the human-caused variety, which decreased during the 1990s (likely thanks to the fall of the Soviet Union), has increased since 1999 (likely thanks to the boom in Asia). The uptick …
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