Early and Profound Human Impact?

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Science  27 Jan 2006:
Vol. 311, Issue 5760, pp. 472
DOI: 10.1126/science.1121900

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Plows, Plagues, and Petroleum. How Humans Took Control of Climate. By William F. Ruddiman. Princeton University Press, Princeton, NJ, 2005. 216 pp. $24.95, £15.95. ISBN 0-691-12164-8.

The author argues for his controversial thesis that preindustrial human societies--through their release of carbon dioxide and methane--changed Earth's climate to the extent that a minor glaciation was averted.