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Old 10-18-2018, 01:14 PM   #3275 (permalink)
NeilBlanchard
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Quote:
Originally Posted by redpoint5 View Post
I'm curious if there has been any research on what the ideal (for human life and activity) ppm for CO2 is, and if others have found similar results?
The ideal is probably what it was for the last 420 thousand years - between 170 and 280 ppm. This seems to be a very stable period, and it covers most of human existence.
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