Professor Judith Curry, climatologist on the IPCC report:
Hiding the Decline | Climate Etc.
In other words the IPCC report is full of misleading sh*t. Furthermore:
Good on for Johnny Ball taking on these dishonest charlatans.
...and in a nutshell, the "real" research question.
Hiding the Decline | Climate Etc.
Bad science and/or dishonesty?
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.
It is obvious that there has been deletion of adverse data in figures shown IPCC AR3 and AR4, and the 1999 WMO document. Not only is this misleading, but it is dishonest (I agree with Muller on this one). The authors defend themselves by stating that there has been no attempt to hide the divergence problem in the literature, and that the relevant paper was referenced. I infer then that there is something in the IPCC process or the authors’ interpretation of the IPCC process (i.e. don’t dilute the message) that corrupted the scientists into deleting the adverse data in these diagrams.
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.
It is obvious that there has been deletion of adverse data in figures shown IPCC AR3 and AR4, and the 1999 WMO document. Not only is this misleading, but it is dishonest (I agree with Muller on this one). The authors defend themselves by stating that there has been no attempt to hide the divergence problem in the literature, and that the relevant paper was referenced. I infer then that there is something in the IPCC process or the authors’ interpretation of the IPCC process (i.e. don’t dilute the message) that corrupted the scientists into deleting the adverse data in these diagrams.
I would like to know what the heck Mann, Briffa, Jones et al. were thinking when they did this and why they did this, and how they can defend this, although the emails provide pretty strong clues. Does the IPCC regard this as acceptable? I sure don’t.
...and in a nutshell, the "real" research question.
I view paleoclimate as a really important subject in the context of understanding climate change. I have no interest in warmest year or warmest decade; rather we need to understand the magnitude and characteristics and causes of natural climate variability over the current interglacial, particularly the last 2000 years. I’m more interested in the handle than the blade of the hockey stick. I also view understanding regional climate variations as much more important than trying to use some statistical model to create global average anomalies (which I personally regard as pointless, given the sampling issue).
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.
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.
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