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stoat | August 22, 2011I've said before (and correctly sourced the original observation to JA) that atmospheric methane is way below its IPCC scenarios (which of course leads to a lower forcing). There is a recent thing in Nature that may explain this:
Atmospheric methane (CH4) increased through much of the twentieth century, but this trend gradually weakened until a stable state was temporarily reached around the turn of the millennium1, 2, after which levels increased once more3. The reasons for the slowdown are incompletely understood, with past work identifying changes in fossil fuel, wetland and agricultural…