UN IPCC Lead Author Dr. Richard Tol Corrects Obama: The 97‰ ‘consensus’ is a ‘bogus number’
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Some of the mistakes in the study should be obvious to all. There are hundreds of papers on the causes of climate change, and thousands of papers on the impacts of climate change and climate policy. Cook focused on the latter. A paper on the impact of a carbon tax on emissions was taken as evidence that the world is warming. A paper on the impact of climate change on the Red Panda was taken as evidence that humans caused this warming. And even a paper on the television coverage of climate change was seen by Cook as proof that carbon dioxide is to blame.
Cook and Co. analysed somewhere between 11,944 and 12,876 papers – they can’t get their story straight on the sample size – but only 64 of these explicitly state that humans are the primary cause of recent global warming. A reexamination of their data brought that number down to 41. That is half a per cent or less of the total, rather than 97 percent.
The paper is a treasure trove of how-not-to lessons for a graduate class on survey design and analysis: the sample was not representative, statistical tests were ignored, and the results were misinterpreted.