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I'll admit I was a bit hyperbolic about the oxygen content thing but your assumption that the trace amounts of CO2 in the atmosphere "would not even be noticeable" is not very supportable either. Do you have anything to back you up other than it just seems like such a minute amount? After all it only takes a trace amount of cyanide in the air to kill you. 270 ppm of cyanide gas in the air will kill you within minutes.
Posted by riverat1