Humans have about as much of an effect on global climate as a few spiders have on the heat of my house.
Humans have about as much of an effect on global climate as a few spiders have on the heat of my house.
There’s little danger to humans of too much CO2 in the air they breathe. Even the Environmental Protection Agency says 1000 ppm is the safe limit for lifetime human exposure. Space shuttle CO2 alarms are set at 5,000 ppm, and the alarm in nuclear subs is set at 8,000 ppm. Today it's about 400 ppm.
(wattsupwiththat.com)
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