The method of disclosure in numerous separate files makes it a rather time-consuming and tedious business to compile a comprehensive overview across government over a long period, but the material is there.

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These findings have now been complemented by Dr Knight's project, which made use of climateprediction.net, a network of personal computers on which processing time is volunteered by members of the public, to compile 57, 000 different runs of a global-climate model developed at the Hadley Centre.

ECONOMIST: Climatology: Grey-sky thinking | The