More on Climategate

Joe Romm tells me to "retract [my] libelous misinformation and apologize to Michael Mann". He is complaining about my suggestion that the various inquiries supposedly vindicating the Climategate emailers have further diminished the credibility of climate science, rather than restoring it.

I think the only issue of substance in his complaint is the charge that I failed to notice that there were two Penn State investigations of Mann, not one, and that both had cleared the accused. Of course I was aware of the form of the inquiry, though I concede that the post was not as clear about the two phases as it should have been.

There was one inquiry with two stages. (Read the Penn state reports here and here.) In my opinion, the first stage does not deserve to be called an investigation. It consisted of little more than a review of the emails and interviews with Mann. I would characterize the result as a cursory dismissal of the charges. The second phase, which looked more carefully at one of the allegations, has a better claim to be called an investigation, but still, I think, falls way short of what would be required to convince a fair-minded reader that the reports were adequate.

I wrote: "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." I should have written: "Three of four allegations are cursorily dismissed; concerning these, no proper investigation was even attempted." I also wrote: "Mann is asked if the allegations (well, one of them) are true, and says no." The words in parentheses were wrong, since Mann was indeed asked to explain himself in relation to the first three allegations. I should have written: "Mann is asked if the allegations are true, and says no."

You be the judge. Read the reports and see if you find the inquiry convincing. I'd draw your attention especially to the finding that deals with "the trick to hide the decline". On this, the first report says:

While a perception has been created in the weeks after the CRU emails were made public that Dr. Mann has engaged in the suppression or falsification of data, there is no credible evidence that he ever did so, and certainly not while at Penn State. In fact to the contrary, in instances that have been focused upon by some as indicating falsification of data, for example in the use of a "trick" to manipulate the data, this is explained as a discussion among Dr. Jones and others including Dr. Mann about how best to put together a graph for a World Meteorological Organization (WMO) report. They were not falsifying data; they were trying to construct an understandable graph for those who were not experts in the field. The so-called "trick" was nothing more than a statistical method used to bring two or more different kinds of data sets together in a legitimate fashion by a technique that has been reviewed by a broad array of peers in the field.

Well. It seems to me, and I dare say to other open-minded readers, that the talk in the emails of a "trick to hide the decline" raised the reasonable suspicion that a trick had been used to hide the decline. "[T]o the contrary," says the report. The "trick" has no connotation of trickery, but merely denotes a "statistical method". Striving to keep a straight face, let us accept this. What about "hide"? Is it all right to employ a "statistical method to hide the decline"? Why was anybody trying to "hide the decline"? (One response might be: because the data which showed the decline were unreliable. Fair enough, but then this rather casts doubt on the whole series, doesn't it, not just on the part that shows a decline?)

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