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Science 4 May 2001:
Vol. 292. no. 5518, pp. 870 - 872
DOI: 10.1126/science.1061664
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Perspectives

Also see the archival list of Science's Compass: Enhanced Perspectives

PALEOCLIMATE:
Enhanced: CO2 and Climate Change

Thomas J. Crowley and Robert A. Berner

On time scales of tens of millions of years, climate is known to undergo massive changes. Previous evidence has suggested a link between natural atmospheric CO2 variability and these long-term climatic oscillations, but some recent studies have found discrepancies. In their Perspective, Crowley and Berner assess the evidence. They conclude that the CO2 model is valid for high-latitude glaciations but that for low latitudes, altered tectonic settings and problems with interpreting climate indicators complicate the picture.

T. J. Crowley is in the Department of Oceanography, Texas A&M University, College Station, TX 77843, USA. R. A. Berner is in the Department of Geology and Geophysics, Yale University, New Haven, CT 06520, USA. E-mail: robert.berner{at}yale.edu

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