Was the Climate of the 20th Century Unusual? – A Reprise

On July 29, 2003, in a hearing before the Senate Environment and Public Works Committee a scientific dispute over the global surface temperature record of the past 1,000 years spilled into a charged political forum. In the highly politicized world of climate change, the trend in global surface temperature is highly salient to policy makers and the media. The claim that the trend seen during the 20th century is unusual is a linchpin of the climate change debate. In this paper the George Marshall Institute analyzes the scientific controversy underlying the political one.

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