By way of preamble, let me remind you where I stand on climate change. I think climate science points to a risk that the world needs to take seriously. I think energy policy should be intelligently directed towards mitigating this risk. I am for a carbon tax. I also believe that the Climategate emails revealed, to an extent that surprised even me (and I am difficult to surprise), an ethos of suffocating groupthink and intellectual corruption. The scandal attracted enormous attention in the US, and support for a new energy policy has fallen. In sum, the scientists concerned brought their own discipline into disrepute, and set back the prospects for a better energy policy.
I had hoped, not very confidently, that the various Climategate inquiries would be severe. This would have been a first step towards restoring confidence in the scientific consensus. But no, the reports make things worse. At best they are mealy-mouthed apologies; at worst they are patently incompetent and even wilfully wrong. The climate-science establishment, of which these inquiries have chosen to make themselves a part, seems entirely incapable of understanding, let alone repairing, the harm it has done to its own cause.
The Penn State inquiry exonerating Michael Mann -- the paleoclimatologist who came up with "the hockey stick" -- would be difficult to parody. Three of four allegations are dismissed out of hand at the outset: the inquiry announces that, for "lack of credible evidence", it will not even investigate them. (At this, MIT's Richard Lindzen tells the committee, "It's thoroughly amazing. I mean these issues are explicitly stated in the emails. I'm wondering what's going on?" The report continues: "The Investigatory Committee did not respond to Dr Lindzen's statement. Instead, [his] attention was directed to the fourth allegation.") Moving on, the report then says, in effect, that Mann is a distinguished scholar, a successful raiser of research funding, a man admired by his peers -- so any allegation of academic impropriety must be false.
You think I exaggerate?
This level of success in proposing research, and obtaining funding to conduct it, clearly places Dr. Mann among the most respected scientists in his field. Such success would not have been possible had he not met or exceeded the highest standards of his profession for proposing research...
Had Dr. Mann's conduct of his research been outside the range of accepted practices, it would have been impossible for him to receive so many awards and recognitions, which typically involve intense scrutiny from scientists who may or may not agree with his scientific conclusions...
Clearly, Dr. Mann's reporting of his research has been successful and judged to be outstanding by his peers. This would have been impossible had his activities in reporting his work been outside of accepted practices in his field.
In short, the case for the prosecution is never heard. Mann is asked if the allegations (well, one of them) are true, and says no. His record is swooned over. Verdict: case dismissed, with apologies that Mann has been put to such trouble.
Further "vindication" of the Climategate emailers was to follow, of course, in Muir Russell's equally probing investigation. To be fair, Russell manages to issue a criticism or two. He says the scientists were sometimes "misleading" -- but without meaning to be (a plea which, in the case of the "trick to hide the decline", is an insult to one's intelligence). On the apparent conspiracy to subvert peer review, it found that the "allegations cannot be upheld" -- but, as the impressively even-handed Fred Pearce of the Guardian notes, this was partly on the grounds that "the roles of CRU scientists and others could not be distinguished from those of colleagues. There was 'team responsibility'." Edward Acton, vice-chancellor of the university which houses CRU, calls this "exoneration".