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Probably the reduction of atmospheric CO2 and the deposition of carbon in sedimentary layers, without decomposition recycling it to the atmosphere - thus releasing free oxygen.
Those are limiting factors on Earth's atmospheric oxygen levels. Surface carbon compounds become progressively more liable to fires, as O2 levels increase.
Air pressure can also be a factor, in respiration and flammability.
Permalink Sat, 09 Jun 2012 21:41:16 UTC | #946645