Take tree ring-based climate reconstructions in the third IPCC report.

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The tree planting is part of a climate change project between the Welsh and Ugandan governments.

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And the idea of anthropogenic climate change rests on a great deal more than just tree-ring records, useful as they are for providing context to the current warming.

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It doesn't seem to be affected all that much by climate, soil conditions, geographical location, growth rate, tree size or disease.

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Comments on the tree-ring section of the IPCC's latest report by John Mitchell, director of climate science at Britain's Met Office, raise issues very like those highlighted by perhaps the most prominent critic of the hockey stick, Steve McIntyre, who runs a blog called Climate Audit.

ECONOMIST: Leaked e-mails do not show climate scientists at their best