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| Keywords: Carbon dioxide variation 450 thousand years.png en Atmospheric carbon dioxide variation from about 450 thousand years ago to nearly the present Source Congressional Budget Office based on J M Barnola C Lorius Raynaud and N I Barkov Historical CO2 Record from the Vostok Ice Core and J R Petit and others Historical Isotopic Temperature Record from the Vostok Ice Core in Department of Energy Oak Ridge National Laboratory Carbon Dioxide Information Analysis Center Trends A Compendium of Data on Global Change 2003 available at http //cdiac esd ornl gov/trends/trends htm 2003-04 https //www cbo gov/sites/default/files/108th-congress-2003-2004/reports/04-25-climatechange pdf The Economics of Climate Change a Primer 2003 Congressional Budget Office Congress of the United States other versions PD-USGov Atmospheric carbon dioxide Paleoclimatology | ||||
