Quote:
Originally Posted by malloyd
However. There's a complicating factor. Stick humans in a sealed environment and they will never actually run out of oxygen, because they die of CO2 poisoning first. Oxidize all the biomass on the planet and depending on whose estimates you use you are actually getting pretty close to toxic levels, and that perhaps [could] happen in a couple centuries, though it probably would take hundreds of times that. There's still lots of oxygen in the air, but you die anyway if you try to breathe it.
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Good point, but I think the
carbonate-silicate cycle might remove the excess carbon dioxide from the air, because CO₂ concentration is equilibrated by feedback through temperature.