Rich countries are being asked to raise their pledges on tackling climate change under a draft text of a possible final deal at the Copenhagen summit.
Documents prepared by the summit's chairmen call on developed nations to cut greenhouse gas emissions by 25-45% from 1990 levels by 2020.
Analyses suggest that current pledges add up to about 18%.
The document leaves open the exact target for limiting temperature rise, amid disputes between various blocs.
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