diver_geek
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There's a good myths v. facts on the site for those that are seriously interested.
http://www.fightglobalwarming.com/page.cfm?tagID=274
"Though natural amounts of CO2 vary from 180 to 300 parts per million (ppm), today's CO2 levels are around 380 ppm. That's 25% more than the highest natural levels, looking back 650,000 years. Increased CO2 levels have corresponded with higher average temperatures throughout that long record. (Boden, Carbon Dioxide Information Analysis Center)"
http://www.fightglobalwarming.com/page.cfm?tagID=274
"Though natural amounts of CO2 vary from 180 to 300 parts per million (ppm), today's CO2 levels are around 380 ppm. That's 25% more than the highest natural levels, looking back 650,000 years. Increased CO2 levels have corresponded with higher average temperatures throughout that long record. (Boden, Carbon Dioxide Information Analysis Center)"