LONDON — Ahead of the Copenhagen conference on climate change (which starts Monday), those who have argued that there is no conclusive proof that climate change is man-made were encouraged by the recent leak of e-mails from the archives of the University of East Anglia. The exchanges suggested that some scientists were manipulating data to support their theories about global warming.

It is unfortunate that acrimony among scientists has sometimes prevented the necessary painstaking review of scientific evidence and opinion.

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