A must-read from Clive Crook in The Atlantic:

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?

The rest here.