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- mike - Jan 18 2007 | co2, global warming, climate, science
Good article containing section on atmospheric CO2 and history. Levels seem to be growing at about 2 ppmv (parts per million by volume) each year as a trend (though we have seasonal fluctuations of 6 ppmv due to plant growth).
Net increase of 110 ppmv since the Industrial Revolution. Since the atmosphere's CO2 composition is now at 383 ppmv, about 1/4 of it can be attributed to man-made sources.
In the last 400,000 years, the earth has "naturally" swung between 200 and 300 ppmv. But if you go back into the 100's of millions of years, we had levels above 2000 ppmv.
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