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, 282 (5387), 279-81

Climate Change Record in Subsurface Temperatures: A Global Perspective

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Climate Change Record in Subsurface Temperatures: A Global Perspective

HN Pollack et al. Science.

Abstract

Analyses of underground temperature measurements from 358 boreholes in eastern North America, central Europe, southern Africa, and Australia indicate that, in the 20th century, the average surface temperature of Earth has increased by about 0.5 degreesC and that the 20th century has been the warmest of the past five centuries. The subsurface temperatures also indicate that Earth's mean surface temperature has increased by about 1.0 degreesC over the past five centuries. The geothermal data offer an independent confirmation of the unusual character of 20th-century climate that has emerged from recent multiproxy studies.

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