Courtesy of Climate Audit (CA), and I have nothing to add because this says it all:
Michael Mann, inventor of the 'Hockey Stick' in Nov 1999:
No researchers in this field have ever, to our knowledge, “grafted the thermometer record onto” any reconstruction. It is somewhat disappointing to find this specious claim (which we usually find originating from industry-funded climate disinformation websites) appearing in this forum [realclimate].
Phil Jones, Chief 'Honcho' at the CRU in Nov 1999
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’s to hide the decline.
Gavin Schidt, defender of the faith at RealClimate, Nov 2009:
Scientists often use the term “trick” to refer to a “a good way to deal with a problem”, rather than something that is “secret”, and so there is nothing problematic in this at all.
So this diagram below is what they produced and endorsed:
But as one of CA's readers pointed out:
The green line is tree-ring data on the left. On the right it has been smoothly merged into temperature data. This is “Mike’s Nature trick”, that Mann falsely claimed was never done. The replacement of actual data with spliced temperature data “hide the decline” in the green tree-ring data curve in the late 20th century, making the reconstruction seem able to model recent temperatures, when it didn’t.
Here is a diagram of Briffa's embarrassing and awkward data part of which (in red) was deleted in the 'trick' which Mann and Jones denied.
Need I say more?
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