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Yes, but burning releases CO2. unlocking permafrost methane or clathrate releases, well, methane, which more abundant in those fossil reservoirs than burnable biomass on the surface, and also methane has 20x more efficient greenhouse effect. So it super-spike in atmospheric methane would be a near-extinction-of-life event. The fossil records show these happened many times, some of these possibly triggered by methane or sulfur releases (from volcanoes). But in the last few million years (where ice cores give us methane ppm), we know there has been no super-spike in methane, despite a few episodes of significantly warmer-than-present temperatures.

Pierre
by Pierre on Thu Jan 3rd, 2008 at 08:38:19 AM EST
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