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Rising Methane Levels Are Cause For Concern

Methane concentrations at the Mauna Loa observatory in Hawaii. The grey data points are preliminary. (Graphic: NOAA.)

We seem to know less about methane emissions than we thought. After a decade of stability, methane concentrations in the atmosphere have been rising strongly in the last 18 months.

Early research work suggested that this rise was concentrated in the northern latitudes of the northern hemisphere and was consistent with greater emissions from decaying organic matter in melting permafrost or from the melting of Arctic sea ice.

Posted in climate change