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VaporTrailx1 VaporTrailx1 is offline
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Old Nov 27th, 2009, 01:06 PM       
The base percentage is based off of pre-industrial levels from around 1750 taken from ice cores in Antarctica. How they got the information for the C02 and O2 levels for millions of years ago is based upon isotopes in rocks.

Either way, the Triassic had to suck balls.
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