Technical Comments

Response to Comment on “The Spatial Extent of 20th-Century Warmth in the Context of the Past 1200 Years”

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Science  29 Jun 2007:
Vol. 316, Issue 5833, pp. 1844b
DOI: 10.1126/science.1141446

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Abstract

Reconsidering the basis for selecting proxy records according to their correlation with local temperature has no substantive influence on the statistical significance of 20th-century warming that we reported, provided that the degree of selectivity is correctly estimated. The conclusion that recent warming is unusually widespread compared with the past 1200 years therefore remains valid.

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