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The UK prime minister, Gordon Brown, and president of France, Nicolas Sarkozy, said their two countries would contribute the bulk of that sum and were trying to persuade smaller members of the 27-state European Union to pledge more.
EU leaders failed on Thursday to come up with a firm figure for the fund, an embarrassing setback for a bloc that has seen itself as a trailblazer in the fight against global warming. Smaller eastern European states are reluctant to donate as they struggle with public sector debt and rising unemployment in the wake of the financial crisis.
The climate aid is intended to go towards a global $10bn (£6bn) annual fund for short-term help to poor countries, particularly in Africa. It would begin in January and run for three years, when any new climate treaty emerging from Copenhagen would come into force.
Click on the title for more information and to see a press conference by Brown and Sarkozy