Mounting hectic last-minute efforts, Secretary of State John Kerry met Environment Minister Prakash Javadekar, the third interaction in three days, as India has demanded that developed countries like the US should shoulder more of the cost that countries face in adapting to the effects of climate change.
Diplomats from 195 countries attending the Conference of Parties (CoP) are grappling with how to resolve differences over crucial issues, which are very dear to the developing nations but could not reach a deal before the self-imposed deadline of tonight.
China was resisting calls, led by the US and the European Union, for all nations to review and update their national plans for curbing greenhouse gas emissions every five years and had also reasserted demands that developed nations do far more to curb greenhouse gas emissions, sources said.
"We are nearly there. I'm optimistic," French Foreign Minister Laurent Fabius told reporters accompanied by UN Secretary-General Ban Ki-moon.
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"I'll present a text tomorrow at 0900 (0800 GMT) to the parties that I'm sure will be adopted."
A desperate UN Secretary General Ban Ki-moon appealed to envoys to take a "final decision for humanity".
"This negotiation is complicated, most difficult but important for humanity. We have just very limited hours remaining."
He identified important questions including how to share the burden of cutting down greenhouse-gas emissions between rich and poor nations; how to finance the cost of climate change in developing countries and how ambitious to be in curbing planetary over-heating.