Actually, I find the methane situation rather more scary than the CO2 one. We know that: Methane is at least 20 times worse as a GHG than CO2; There are vast quantities of it locked up in clathrates and in frozen soil, so there is potential for a nasty positive feedback effect if this gets released by warming/deforestation; Other pollution (Carbon monoxide, sulphur oxides) causes methane to persist longer in the atmosphere; There has been at least one methane induced major climate change and mass extinction 'PETM' Also we probably don't know enough about the sources and sinks of methane. KP
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