IPCC Summary for Policymakers and some good commentary

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Once again, even more emphatically than before, the Intergovernmental Panel on Climate Change says the fundamental climate of the planet is being radically changed for the worse by humans. The IPCC today released the Summary for Policymakers portion of the first volume of the IPCC's Fifth Assessment Report (AR5), the Working Group I report on The Physical Science Basis. AR5 will be presented in four volumes when fully completed. In the words of White House science adviser John Holdren, it “represents the most comprehensive and authoritative synthesis of scientific knowledge about global climate change ever generated.”

Full text of the WGI policymaker summary:

Intergovernmental Panel on Climate Change, Fifth Assessment Report, Working Group I -- The Physical Science Basis, Summary for Policymakers, approved September 27, 2013

Some of the major media coverage:

Justin Gillis, New York Times: U.N. Climate Panel Endorses Ceiling on Global Emissions

Darryl Fears, Washington Post: IPCC report says humans almost certainly cause global warming

Fiona Harvey, Guardian: IPCC climate report: human impact is 'unequivocal'

Some early commentary, for putting the report in perspective:

Stefan Rahmstorf, RealClimate: The new IPCC climate report

Dana Nucitelli, Skeptical Science: Why is the IPCC AR5 so much more confident in human-caused global warming? (also in the Guardian)

Joe Romm, Climate Progress, Alarming IPCC Prognosis: 9°F Warming For U.S., Faster Sea Rise, More Extreme Weather, Permafrost Collapse

Michael Mann and Dana Nucitelli, ABC Environment (Australia): IPCC report underlines the need for climate action

Peter Frumhoff, Union of Concerned Scientists: 2° C or Not 2° C: Insights from the Latest IPCC Climate Report

Michael Mann, LiveScience: Climate-Change Deniers Must Stop Distorting the Evidence (Op-Ed)

Ryan Koronowski, Climate Progress: 15 Things You Should Know About The New IPCC Report On Climate Science

InsideClimate News, Top 10 Takeaways From the New IPCC Climate Report

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