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Science 29 June 2007:
Vol. 316. no. 5833, p. 1844
DOI: 10.1126/science.1141446
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Technical Comments

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

Timothy J. Osborn* and Keith R. Briffa

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.

Climatic Research Unit, School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK.

* To whom correspondence should be addressed. E-mail: t.osborn{at}uea.ac.uk

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Science. ISSN 0036-8075 (print), 1095-9203 (online)