File:Carbon dioxide 800k.png
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Air bubbles trapped in Antarctic ice preserve an 800,000-year record of atmospheric carbon dioxide levels, which naturally varied from about 180 to about 280 parts per million. Once humans began burning large quantities of coal and oil in the 19th century, concentrations rose to 315 parts per million by 1958 (when direct measurements of carbon dioxide in the Antarctic atmosphere began) to 380 parts per million in 2007. (NASA graph by Robert Simmon, based on data from Keeling et al., 2008.)
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| current | 08:55, 5 May 2010 | | 720 × 190 (6 KB) | Pile (Talk | contribs) | (Air bubbles trapped in Antarctic ice preserve an 800,000-year record of atmospheric carbon dioxide levels, which naturally varied from about 180 to about 280 parts per million. Once humans began burning large quantities of coal and oil in the 19th century) |
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