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Originally Posted by LSCto300C

Obviously though, too much CO2 is harmful and even fatal to humans, but in larger amounts than our atmosphere has (or should ever have).

On Mythbusters, I saw a piece of a show where they busted a myth on CO2 cunsumption by a man in a bubble. They put him in there with only the oxygen that was already in there and he was breathing in the CO2 he was exhaleing. Guess what happened after hours in there? Nothing.