Vested interests have tried to spread misinformation about global warming, but scientific evidence shows urgent action is neededMany people ask how sure we are about the science of climate change. The most definitive examination of the scientific evidence is to be found in the work of the Intergovernmental Panel on Climate Change (IPCC) and its last major report published in 2007. I had the privilege of being chairman or co-chairman of the panel's scientific assessments from 1988 to 2002.Many hundreds of scientists from different countries were involved as contributors and reviewers for these reports, which are probably the most comprehensive and thorough international assessments on any scientific subject ever carried out. In June 1995, just before the G8 summit in Scotland, the academies of science of the world's 11 largest economies (the G8 plus India, China, and Brazil) issued a statement endorsing the IPCC's conclusions and urging world governments to...
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