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How much higher were the levels of CO2 in the atmosphere in the times of the dinosaurs?
Question Date: 2007-04-24
Answer 1:

CO2 levels in the atmosphere were much, much higher when the dinosaurs were around and were about 7-8 times higher than they are right now (2,250 parts per million or 2,250 particles of CO2 per million total particles in the atmosphere.)

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