EU leaders are trying to break an impasse over funding to help poor countries combat global warming on the last day of their Brussels summit.
Sweden's prime minister called on EU leaders to set a fixed sum, paving the way for other rich donors like the US and Japan to make similar pledges.
But a coalition of nine poorer European nations has threatened to block a deal unless richer EU countries pay more.
Earlier leaders agreed a deal to secure the ratification of the Lisbon treaty.
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