“Very few paleoclimatologists agreed to the shape of the (hockey stick) curve.”
PROFESSOR PER HOLMLUND, PHD Professor of Glaciology at Stockholm University. Member of the national committee of geophysics at the Royal Swedish Academy of Sciences, and if the International Meteorological Institute. Former Director of Tarfala Research Station, and member of many expeditions to the Arctic and Antarctic. Swedish member of the World Glacier Monitoring Service, the International Arctic Science Committee, the Scientific Committee for Antarctic Research, etc.
Eventually, Mann was forced to issue corrections to the two MBH papers in successive months in June 2004 (in Geophysical Research Letters) and in July 2004 (in Nature). If the correction does “not contradict the original publication”, Nature’s policy is to publish it as an “addendum”. But, “if the scientific accuracy or reproducibility of the original paper is compromised”, only a “corrigendum” can be published. Both of the above were “corrigenda” - yet Mann refused to accept the plain meaning of that word. In 2005 Professor Marcel Leroux wrote319: After describing their errors, they still considered (2004) that “none of these errors affect our previously published results”! …The corrigenda issued by Mann et al are “a clear admission that the disclosure of data and methods… was materially inaccurate.” At the IPCC there would not be even a corrigendum. Many serious paleoclimatologists were astonished by Mann’s hockey stick, and then appalled at its adoption by the IPCC for the Third Assessment Report. For the Fourth Assessment Report, they attempted to restore some sanity. Reviewing the Second Order Draft, Professor Holmlund wrote320: This remark concerns the handling of the Mann “hockey stick”… When Mann et al presented their hockey stick six-to-seven years ago they formatted paleodata in such a way that climate modellers could use it. But very few paleo climatologists agreed to the shape of the curve and nowadays we have much better data to use. It is therefore natural to describe the Mann curve in a history of science perspective, but not as a valid data set. A good example of a good modern curve is the one presented by Moberg et al… It has at least the variation seen in almost all paleo climate records for the past millennia. In the present IPCC text the view described is that we have the hockey stick and then later some scientists have raised critical voices. The basic meaning is that the hockey stick is still the number one description of the past millenia. This is not flattering and it certainly mis-credit [sic] the report. I believe that it is rather easy to go through the five pages and update the spirit of the text and perhaps make some adjustments in the figure captions. But Mann’s Hockey Team were still running the show and any suggestion that the IPCC acknowledge valid criticisms of the stick met with rejection. Professor Holmlund received the following response: Rejected – the Mann et al curve is included for consistency and to maintain a historical context for the current state of the art.
Steyn, Mark (2015-09-01). "A Disgrace to the Profession" (Kindle Locations 3647-3648). Stockade Books. Kindle Edition.