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Climate Change
January, 2007
The United States joined 112 other nations in finalizing and approving a landmark climate change science report in Paris, which was released on February 2, 2007.

Working Group I of the Intergovernmental Panel on Climate Change (IPCC) acted to finalize its contribution to the IPCC's Fourth Assessment Report.

The Fourth Assessment Report, consisting of three Working Group contributions and a Synthesis Report, will be released in the fall.

The Working Group I portion of the Assessment Report released today represents a comprehensive assessment of the most recent state of knowledge of the physical science of climate change.

A Summary for Policymakers, which is a condensed summary of the Working Group I assessment was approved on a line-by line basis by the participating nations over this past week and released in Paris today.

The last IPCC assessment of the physical science aspects of climate change was issued in 2001.

"This Summary for Policymakers captures and summarizes the current state of climate science research and will serve as a valuable source of information for policymakers," said Dr. Sharon Hays, the leader of the U.S. delegation at the meeting and Associate Director/Deputy Director for Science at the White House Office of Science and Technology Policy.

"It reflects the sizeable and robust body of knowledge regarding the physical science of climate change, including the finding that the Earth is warming and that human activities have very likely caused most of the warming of the last 50 years."

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