There is no question that the diagrams and accompanying text in the IPCC TAR, AR4 and WMO 1999 are misleading. I was misled. Upon considering the material presented in these reports, it did not occur to me that recent paleo data was not consistent with the historical record. The one statement in AR4 (put in after McIntyre’s insistence as a reviewer) that mentions the divergence problem is weak tea.
I don’t want to throw the baby away with the bath water here. But this whole issue is a big problem for the science and has been an enormous black eye for the credibility of the IPCC and climate science. I suspect that many denizens will be on board with my assessment and are very familiar with McIntyre’s analysis. I would be particularly interested in hearing from any defenders of these global paleotemperature analyses by Mann et al.