MARRAKESH, Morocco, (Reuters) – Delegates to climate  talks in Copenhagen may not be able to agree even a partial  solution to the problem of how to tackle global warming by  December, a top international climate change official said.

The head of energy efficiency and environment at the  International Energy Agency, Richard Bradley, said he sensed  delegates were not interested in half-way measures because they  feared that might tie their hands in other areas later.

“It looks like negotiators from the major economies are  unlikely to conclude that addressing part of the problems in  Copenhagen and then finishing them later is an outcome they  could live with,” Bradley told Reuters late on Saturday.      “The negotiators I have talked to … probably aren’t  prepared to solve part of the problems (in Copenhagen),” he  said. “Frankly, from what I have seen, they are not even ready  to solve any of the problems.”

After months of saying there is no “Plan B”, the United  Nations, Denmark and some other European countries now say the  December 7-18 conference may at best reach a political deal to  step up the fight against global warming.

Agreeing to extra talks in 2010 risks a loss of momentum but  even backers of a robust pact are reluctantly starting to look  to new deadlines next year.

China and India say industrialised countries should cut  emissions by 2020 by at least 40 percent below 1990 levels —  far more than average cuts on offer of between 11 and 15 percent  — and want billions of dollars in aid and new technology.