Quote:
Originally Posted by redpoint5
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?
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I recommend you check out the Japanese Imperial Army,NACA/NASA/US Army,US NAVY,and Wermacht human factors research conducted long ago. They've exposed volunteers to myriad varying environmental conditions, measured ,and documented affects,up to, and including death.