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Tree-ring records play an important role in reconstructing climate change patterns over the last millenium. In their Perspective, [Briffa and Osborn][1] highlight the report by [ Esper et al .][2] of a largely independent record of widespread tree-growth variations across the extra-tropical Northern Hemisphere. Estimates of past temperature changes based on the record suggest that climate swings in the last 1000 years were greater than has yet been generally accepted. [1]: http://www.sciencemag.org/cgi/content/full/295/5563/2227 [2]: http://www.sciencemag.org/cgi/content/short/295/5563/2250
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Briffa et al. (2002) studied this question.
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