Summary for Policymakers A Report of Working Group I of the

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Intergovernmental Panel on Climate Change

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Intergovernmental Panel on Climate Change

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The Third Assessment Report of Working Group I of the

Intergovernmental Panel on Climate Change (IPCC) builds

upon past assessments and incorporates new results from the

past five years of research on climate change.1 Many hundreds

of scientists2 from many countries participated in its preparation

and review.

This Summary for Policymakers (SPM), which was approved

by IPCC member governments in Shanghai in January 2001,3

describes the current state of understanding of the climate

system and provides estimates of its projected future evolution

and their uncertainties. Further details can be found in the

underlying report, and the appended Source Information

provides cross references to the report's chapters.