Negotiations on the draft agreement to curb greenhouse gas emissions, blamed for warming the planet and disrupting the climate, were extended by a day on Friday to Saturday to try to overcome stubborn divisions among the 195 countries taking part.
The draft text, released on Thursday and subject to revision, also proposes that emissions peak "as soon as possible", with rapid cuts thereafter towards achieving "greenhouse gas emissions neutrality in the second half of the century".
Neutrality refers to all greenhouse gases, not just carbon dioxide, and means net zero man-made emissions from all sectors.
Overall emissions would need to be reduced to as close to zero as possible and any remaining would have to be soaked up by forests and soils or buried underground by costly technology such as carbon capture and storage.
Scientists said the targets in the draft were too lax to achieve the goal of limiting global temperature rises above pre-industrial times to "well below 2C", while pursuing efforts to limit the temperature increase to 1.5C (2.7F).
The rise in average global temperatures above pre-industrial times will exceed 1C this year, Britain's Met Office has said.
Read more at Climate Draft Puts Temperature Limit Out of Reach: Scientists
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