The IPCC Fourth Assessment Report of 2007 (AR4) contained various errors, including the well publicised overestimate of the speed at which Himalayan glaciers would melt. However, the IPCC’s defenders point out that such errors were inadvertent and inconsequential: they did not undermine the scientific basis of AR4. Here I demonstrate an error in the core scientific report (WGI) that came about through the IPCC’s alteration of a peer-reviewed result. This error is highly consequential, since it involves the only instrumental evidence that is climate-model independent cited by the IPCC as to the probability distribution of climate sensitivity, and it substantially increases the apparent risk of high warming from increases in CO2 concentration.
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IPCC’s Forster/Gregory 06 PDF curve for S is very different from the PDF based on the original results. The IPCC curve is skewed substantially to higher climate sensitivities and has a much fatter tail than the original results curve. At the top of the ‘extremely likely’ range, it gives a 2.5% probability of the sensitivity exceeding 8.6°C, whereas the corresponding figure given in the original study is only 4.1°C. The top of the ‘likely’ range is doubled, from 2.3°C to 4.7°C, and the central (median) estimate is increased from 1.6°C to 2.3°C.
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