"We are quite confident, I think with joint efforts by tomorrow we shall have a Paris agreement," said Liu, the deputy head of the Chinese delegation to the 195-nation UN summit in Paris, which has run past this evening deadline for a deal.
France said the talks would be extended, with hopes of wrapping them up tomorrow, after ministers failed to bridge deep divides during marathon negotiations.
French Foreign Minister Laurent Fabius was also upbeat about a deal, saying he was "sure" of success.
However, India's Environment Minister Prakash Javadekar warned today that success in Paris is not guaranteed, saying the developed world is not "accommodating and is not showing flexibility" to the concerns of developing countries.
"French President (Francois) Hollande has warned twice that if the developed world doesn't show that spirit of accommodation then Paris success is not guaranteed," Javadekar said.
"That is what the French President Hollande said and is what I repeat."
Many world leaders have billed the talks as the last chance to avert disastrous climate change: increasingly severe drought, floods and storms, as well as rising seas that would engulf islands and populated coasts.
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