
The United Nations proposed that rich countries pay to help poor ones curb pollution, while cutting their own emissions by at least 75% and possibly more than 95% by 2050 -- a suggestion that heightened tensions between the U.S. and China over climate change.
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It isn't clear that the Copenhagen summit will yield a binding agreement on nations' efforts to combat climate changes. The U.N. document is the first official attempt to outline a substantive agreement from the summit.
On Friday, negotiations continued for a fifth day of the 12-day conference, with ministers from a number of countries directly participating in the talks. The draft proposal is vague in key areas to be discussed late next week, when many world leaders arrive.
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