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The real danger of the carbon dioxide saturation is that global warming might run amok. Long before the oxygen runs out and anything starts suffocating, global warming will cause massive famines--either from current agricultural land turning to desert, or from global warming triggering an ice age. Most of the people in industrialized areas will starve. Of course, the leaders of the desertifying/newly ice-covered (take your pick) countries will wage wars to get whatever land is still useful; there will be massive chaos as the thin veneer of civilization chips away. Then, after the massive die-offs from starvation, and after the wars, there will be a lot of corpses around, and epidemics will rage.
In the long term, the biosphere will replentish the oxygen in the atmosphere until it nears its present levels. Humans will probably even survive, in isolated populations around the equator.
I expect that the eventual extinction of humans will be the result of an asteroid or comet impact, or a supervolcano.
Tucker
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