The cat i' the adage

"The growth of knowledge depends entirely on disagreement" Karl Popper (1902 - 1994)

Monday, June 27, 2005

Dead Mann walking?

There has been a significant development in the controversy over the Mann "Hockey Stick" graph and its role in the IPCC report on climate change. The US House of Representatives Energy and Commerce Committee is demanding from Mann and his team disclosure of code used to generate their results and detailed answers to some searching methodological questions. This follows the devastating critique by McIntyre and McKitrick, and Mann's subsequent unwillingness to lay his work open to proper audit.

This gives a flavour of the letter from the Committee:

5. According to The Wall Street Journal, you have declined to release the exact computer code you used to generate your results. (a) Is this correct? (b) What policy on sharing research and methods do you follow? (c) What is the source of that policy? (d) Provide this exact computer code used to generate your results.

Over at McIntyre's ClimateAudit site there is feverish speculation that the end is in sight for the Hockey Stick and the highly contentious claim that the 1990s were the hottest decade of the millennium.


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