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The full email from Jones says: "I've just completed Mike's Nature trick of adding in the real temps to each series for the last 20 years (ie from 1981 onwards) and from 1961 for Keith [Briffa]'s, to hide the decline." The decline being referred to was an apparent decline in temperatures shown in analysis of tree rings. Tree rings have historically correlated well with changes in temperature, but that relationship has broken down in the past half century. The reasons are still debated among scientists.

The "trick" was a graphic device used by Mann in a 1998 paper in Nature to merge tree ring data from earlier times with thermometer data for recent decades. He explained it in the paper. Jones was repeating it in another paper. "This is a trick only in the sense of being a good way to deal with a vexing problem," Mann told the Guardian.

Clearly this problem with modern tree ring data raises questions about older tree ring data – at least until the recent divergence from real temperatures is nailed down. And to anyone not familiar with the problems of reconstructing past temperatures from such proxy data, the "trick" may come as a surprise. But it is manifestly not clandestine data manipulation. Nor, as claimed by Palin and Inhofe, is it a trick to hide global cooling. That charge is a lie.

While he was in Copenhagen, Inhofe made a direct link between the "trick" to "hide the decline" and the second most popular soundbite from the emails. He said "of course [Jones] meant hide the decline in temperatures, which caused another scientist, Kevin Trenberth of the National Centre for Atmospheric Research in Boulder, Colorado, to write: "The fact is that we can't account for the lack of warming at the moment and it is a travesty that we can't."

The link is bogus. The two emails were ten years apart.

...

In another case George Will, celebrated in some circles as an intellectual, told ABC's This Week programme that Mann had said in an email that he wished to "delete, get rid of, the medieval warming period". No such words appear anywhere in the emails. What Mann actually said was that "it would be nice to try to 'contain' the putative 'MWP'". Some bloggers suggested this amounted to extinguishing it from the data record. But an intellectual like Will should have known that, in this context, "contain" means to understand its dimensions – how warm it was and how long it was. Mann explained as much to anyone who asked. Verdict: not guilty.