Despite loads of public scorn heaped on Steve McIntyre and Ross McKittrick for their criticisms of the Mann hockey stick, it turns out in private folks like the Hadley Center’s John Mitchell, the review editor for the relevant chapter of the last IPCC report, shared many concerns identical to those of M&M. The email at the link is pretty amazing – it is practically an outline of the section of my skeptic presentation dealing with the hockey stick. But not a whiff of this uncertainty was ever made public or was included in the IPCC report.
Mitchell and the Hadley Center have tried every trick in the book to avoid FOIA of anything that would publicly reveal his true concerns about Mann’s study. When we understand the incentives that are driving him to suppress his own scientific views, and to publicly ridicule those who share his private concerns, we will understand better what is broken in the climate science process.