A big strength of the IPCC is that its assessments of the climate are approved both by scientists and by governments - giving the findings broad acceptance in negotiations on a U.N. deal to fight climate change, due to be agreed by 2015. Possible reforms will be discussed at talks in Georgia in October.
"I support the global assessment cycle, but would strongly argue for the need to complement it with frequent updates," said Johan Rockstrom, director of the Stockholm Resilience Center.
Drafts of the Stockholm report show that the IPCC is set to raise the probability that most climate change since the 1950s is man-made to "extremely likely", or at least 95 percent, from "very likely" or 90 percent, in 2007.
Many nations including the United States, in submissions this year to the IPCC about reforms, also argue for more special reports. In recent years the IPCC has produced reports on extreme weather and on renewable energies.
Britain suggests using Web-based "wiki" type tools that could allow more frequent updates. Italy says that there is "no automatic need" for another blockbuster report about the science of climate change, like the one in Stockholm.
One problem is that IPCC assessments are quickly out of date. Scientists trying, for instance, to account for a "hiatus" in the pace of global warming this century are only allowed to consider peer-reviewed literature from before mid-March 2013.
Scientists who contribute to the IPCC work for free.
It means prestige - the IPCC shared the 2007 Nobel Peace Prize - but also criticism, for instance after the IPCC exaggerated the pace of the thaw of Himalayan glaciers in 2007 by projecting they might all vanish by 2035.
(Reporting By Alister Doyle; editing by Ralph Boulton)
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