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Science 28 June 2002:
Vol. 296. no. 5577, pp. 2342 - 2343
DOI: 10.1126/science.1071755
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Books

HUMAN EVOLUTION:
Out of the Chattering Ice

A review by Robert N. Proctor

A Brain for All Seasons Human Evolution and Abrupt Climate Change
William H. Calvin
University of Chicago Press, Chicago, 2002. 349 pp. $25, £16. ISBN 0-226-09201-1.

Through the course of a travelogue, Calvin argues that repeated episodes of abrupt cooling played a critical role in human evolution and that human-caused global warming may paradoxically trigger another crash in global temperatures.
The author is in the Department of History, Weaver Building, Pennsylvania State University, University Park, PA 16802, USA. E-mail: rnp5{at}psu.edu

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