IPCC adopts major assessment of climate change science

The Intergovernmental Panel on Climate Change has concluded that global climate change is "very likely" to have a human cause.

The IPCC said temperatures were probably going to increase by 1.8-4 °C (3.2-7.2 °F) by the end of the century.

It also projected that sea levels were most likely to rise by 28-43cm, and global warming was likely to influence the intensity of tropical storms.

Working Group I of the Intergovernmental Panel on Climate Change (IPCC) 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.

The report was produced by some 600 authors from 40 countries. Over 620 expert reviewers and a large number of government reviewers also participated. Representatives from 113 governments reviewed and revised the Summary line-by-line during the course of this week before adopting it and accepting the underlying report.

The Summary can be downloaded in English from http://www.ipcc.ch/SPM2feb07.pdf. A webcast of the final press conference has also been posted. The Summary will be available in Arabic, Chinese French, Russian and Spanish at a later date. The full underlying report will be published in English by Cambridge University Press.


The Intergovernmental Panel on Climate Change predicts that temperatures are most likely to rise by 1.8 °C-4 ° C by 2100. But the possible range is much greater; 1.1 °C-6.4 °C. The maps above show how a range of three different scenarios will affect different parts of the planet.

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