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Jean-Pascal van Ypersele, the panel's vice chairman, said the mistake -- one sentence in a lengthy report known as AR4 and released in 2007 -- does not invalidate the case that manmade global warming is causing glacial melting, the BBC said.

"Some people will attempt to use it to damage the credibility of the IPCC; but if we can uncover it, and explain it and change it, it should strengthen the IPCC's credibility, showing that we are ready to learn from our mistakes", van Ypersele said.

A hacker in 2009 stole e-mails exchanged with climate scientists at the Climatic Research Unit at East Anglia University. Climate change skeptics suggested the e-mails showed scientists willing to fake evidence to back up their claims.

Jeffrey Kargel of the University of Arizona told the BBC in December it would be physically impossible for the Himalayan glaciers, some of them more than 1,300 feet thick, to melt in 25 years.

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