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Marks says:
Appears Real Climate and Michael Mann began their spin a day ago on this story:
http://www.realclimate.org/index.php/archives/2012/07/tree-rings-and-climate-some-recent-developments/#more-12427
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George says:
While tree rings by themselves may not represent temperature, the combination of tree rings and the isotopes contained in the wood together can be a pretty good indication.