News of the WeekClimate Change

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

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Science  26 Jan 2001:
Vol. 291, Issue 5504, pp. 566
DOI: 10.1126/science.291.5504.566A

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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.