claim: However, a single scientist, Dr. Ben Santer of Lawrence Livermore National Laboratory, rewrote the draft at the IPCC’s request, deleting all five statements, replacing them with a single statement to the effect that a human influence on global climate was now discernible, and making some 200 consequential amendments.
evidence: The balance of evidence suggests a discernible human influence on global climate ( considerable progress since the 1990 report in distinguishing between natural and anthropogenic influences on climate, because of : including aerosols; coupled models; pattern-based studies ) Climate is expected to continue to change in the future ( increasing realism of simulations increases confidence; important uncertainties remain but are taken into account in the range of model projections ) There are still many uncertainties ( estimates of future emissions and biogeochemical cycling; models; instrument data for model testing, assessment of variability, and detection studies ) The Third Assessment Report ( TAR ) was completed in 2001 and consists of four reports, three of them from its Working Groups : Working Group I : The Scientific Basis Working Group II : Impacts, Adaptation and Vulnerability Working Group III : Mitigation Synthesis Report A number of the TAR's conclusions are given quantitative estimates of how probable it is that they are correct, e.g., greater than 66% probability of being correct.