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Climate change scientists at the centre of a row over man-made global warming have been criticised for being "naive" and "disorganised".
The Climatic Research Unit at the University of East Anglia was "ill-prepared for being the focus of public attention" when sceptics began to question its figures on climate change, according to an independent inquiry.
As well as taking issue with the researchers' record keeping, the panel of experts said better statistical methods should have been used to interpret the "messy" data on world temperatures.
But there was no evidence of "deliberate scientific malpractice", meaning the conclusion that mankind was causing global warming was probably correct.