The vice-chairman of the UN's climate science panel has admitted it made a mistake in asserting that Himalayan glaciers could disappear by 2035, reports indicate.
The Intergovernmental Panel on Climate Change (IPCC) included the date in its 2007 assessment of climate impacts.
A number of scientists have recently disputed the 2035 figure, and Dr Jean-Pascal van Ypersele told BBC News that it was an error and would be reviewed.
Dr van Ypersele said the episode meant that the panel's reviewing procedures would have to be tightened.
The claim that Himalayan glaciers could disappear by 2035 appears to have originated in a 1999 interview with Indian glaciologist Syed Hasnain, published in New Scientist magazine.
The figure then surfaced in a 2005 report by environmental group WWF - a report that is cited in the IPCC's 2007 assessment, known as AR4.
An alternative genesis lies in the misreading of a 1996 study that gave the date as 2350.
The AR 4 report had asserted, "Glaciers in the Himalayas are receding faster than in any other part of the world... the likelihood of them disappearing by the year 2035 and perhaps sooner is very high."
The row erupted in India late last year in the run-up to the Copenhagen climate summit, with opposing factions in the government giving radically different narratives of what was happening to Himalayan ice.n December 2009, it emerged that four leading glaciologists had prepared a letter for publication in the journal Science arguing that a complete melt by 2035 was physically impossible.
"You just can't accomplish it," Jeffrey Kargel from the University of Arizona told BBC News at the time.
"If you think about the thicknesses of the ice - 200-300m thicknesses, in some cases up to 400m thick - and if you're losing ice at the rate of a metre a year, or let's say double it to two metres a year, you're not going to get rid of 200m of ice in a quarter of a century," he said.
The row continues in India, with Environment Minister Jairam Ramesh calling this week for the IPCC to explain "how it reached the 2035 figure, which created such a scare".
Georg Kaser from the University of Innsbruck in Austria, who led a different portion of the AR4 process, said he had warned that the 2035 figure was wrong in 2006, before AR4's publication.
He suggested that some of the IPCC's working practices should be revised by the time work begins on its next landmark report, due in 2013.