The UK government says it is highly unlikely that a new legally binding climate treaty can be agreed this year - and a full treaty may be a year away.
Two years ago, the world's governments vowed to finalise a new treaty at next month's climate summit in Copenhagen.
Climate Secretary Ed Miliband has until now said it could be done - but now he says only a political deal is likely, echoing some other senior figures.
Developing countries reacted with frustration and disappointment.
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