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Science 26 January 2001:
Vol. 291. no. 5504, p. 566
DOI: 10.1126/science.291.5504.566A
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News of the Week

CLIMATE CHANGE:
It's Official: Humans Are Behind Most of Global Warming

Richard A. Kerr

The United Nations-sponsored Intergovernmental Panel on Climate Change officially declared early this week that "most of the observed warming over the last 50 years is likely to have been due to the increase in greenhouse gas concentrations." The panel was vaguer than ever, though, about how bad things could get by the end of the century. At a minimum, the world will warm more than twice as much in the coming century as it did in the past one, the panel concluded, but it could warm 10 times as much.

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