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The report, based on an analysis by the Stockholm Environment Institute commissioned and released by Oxfam, evaluated national pledges to cut carbon emissions submitted after the 2009 Copenhagen climate summit. It found that developing countries account for 60 percent of the promised reductions.

The analysis is complicated because countries use different yardsticks and baseline years for measuring reductions.

But the study calculated that China, which has pledged to reduce emissions in relation to economic output by 40-45 percent, will cut its carbon output twice as much as the United States by 2020.