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Working Group I of the Intergovernmental Panel on Climate Change (IPCC) has adopted the Summary for Policymakers of the first volume of "Climate Change 2007," also known as the Fourth Assessment Report (AR4).

"Climate Change 2007: The Physical Science Basis" assesses the current scientific knowledge of the natural and human drivers of climate change, observed changes in climate, the ability of science to attribute changes to different causes and projections for future climate change.

Approximately 600 authors from 40 countries produced the report. More than 620 expert reviewers and many government reviewers participated in developing the report. Representatives from 113 governments reviewed and revised the summary before adopting it and accepting the underlying report. The summary can be downloaded at www.ipcc.ch

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