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File:Temperature variation over Antarctica 450 thousand years.png

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English: Variation in temperature over Antarctica, from around 450 thousand years ago to 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.
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Source The Economics of Climate Change: a Primer (2003)
Author Congressional Budget Office (Congress of the United States)

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This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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