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Over a period of about a thousand years, human-disseminated and harvested plants would be able to put ~150 mbar (millibars) of oxygen in the Martian atmosphere. Once this occurs, humans and other animals will be able to live on Mars in the open, and the world will become fully alive.
Originally posted by Zzub
150 millibars is 2.17 pounds per square inch. Sea level on Earth, the pressure is just over 14 pounds per square inch. You would explode at 150 millibars. I don't see how he can claim you could walk around at that pressure.
For a thousand years of hard labour, that's little reward. Mars does not have enough mass to retain a decent atmosphere. (or the magnetosphere to keep cosmic rays out).
[Edited on 16-7-2004 by Zzub]