Talks on a historic deal to revert global warming has been extended beyond the official deadline at the UN-backed International climate change summit in Paris and a draft deal will be presented to the ministers of more than 190 nations for approval on Saturday.

French Foreign Minister Laurent Fabius said he is certain that the bill will be approved.

"I will be in a position (on Saturday) morning to present to all parties a text, which, I am sure, will be approved and will be a big step forward for humanity as a whole," the ABC quoted Fabius as saying. "We will never again get such momentum as we are feeling now in Paris. But now responsibility for reaching agreement rests with the ministers, who are going to have to make a choice tomorrow. I'm going to present a text to them which is the most ambitious and the most balanced possible. We are almost at the end of the road and I am optimistic."

The talks on the deal have extended to another weekend as negotiations on it are taking longer time than was expected. Two weeks have gone into the debate to settle the disputes that are arising out of the talks.

Fabius ascertained that the talks till now have progressed on a positive note and some key issues have been underlined on Friday.

China, which is the biggest greenhouse gas emitter of the world, said it is positive that a historic deal would be struck on Saturday. Australian Foreign Minister Julie Bishop, who is leading the Australian delegation at the talks, also said she is certain about the development.

"There were some very detailed negotiations overnight. We anticipate the presidency will deliver a final text at 9:00am tomorrow morning and thereafter we will be in the final stages," she said.

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