Richard Black writes for the BBC,
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.
Small island states and poorer nations of Africa and Latin America have called for the document to endorse the target of keeping the temperature rise since pre-industrial times below 1.5C (2.7F).
This is below the figure of 2C (3.6F), which was endorsed by the G8 and major developing economies in July, and implies the need for drastic emission cuts.
An analysis by the UK Met Office, released at this meeting, showed that meeting 1.5C would be “almost impossible” to meet without implementing measures to take carbon dioxide out of the air.
The temperature figures are listed as alternatives in the draft documents.
Work in progress
The texts are a long way short of constituting a final outcome document, as they leave open some of the most difficult points of the negotiations so far, including the legal form of any new agreement.