Dr. William Happer, currently a professor of Physics at Princeton University, was once fired by Gore at the department of Energy 1993 for disagreeing with the Vice-President on the effects of ozone to humans and plant life, also disagrees with Gore's claim that manmade CO2 increases the temperature of the earth and is a threat to mankind. Happer appeared before the US Senate's Environment and Public Works Committee on Feb 25, 2009 and explained CO2 is in short-supply in relative terms of the history of this planet.
"Many people don't realize that over geological time, we're really in a CO2 famine now. Almost never has CO2 levels been as low as it has been in the Holocene - 280ppm - That's unheard of," Most of the time it's at least 1000ppm and it's been quite higher than that."
Happer said that when CO2 levels were higher - much higher than they are now, the laws of nature still managed to function as we understand them today.
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