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Science 8 December 2006:
Vol. 314. no. 5805, pp. 1556 - 1557
DOI: 10.1126/science.1136110
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Perspectives

ATMOSPHERE:
An Ancient Carbon Mystery

Mark Pagani, Ken Caldeira, David Archer, James C. Zachos

Sudden global warming 55 million years ago provides evidence for high climate sensitivity to atmospheric CO2, but the source of the carbon remains enigmatic.

M. Pagani is in the Department of Geology and Geophysics, Yale University, New Haven, CT 06520, USA. E-mail: mark.pagani{at}yale.edu K. Caldeira is in the Department of Global Ecology, Carnegie Institution, Stanford, CA 94305, USA. D. Archer is in the Department of Geophysical Sciences, University of Chicago, Chicago, IL 60637, USA. J. C. Zachos is in the Earth Sciences Department, University of California, Santa Cruz, CA 95064, USA.

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