A final draft of the international climate deal negotiated at United Nations talks in Paris includes a target to keep temperature rises "well below" 2C and commits to strive to curb increases to 1.5C.
French foreign minister Laurent Fabius, who is chairing the talks, told countries: "It's my deep conviction that we have come up with an ambitious and balanced agreement", as he presented them with the final draft.
"You are going to be deciding a historic agreement," he told ministers. "The world is holding its breath, it's counting on all of us."
Delegates applauded the start of the meeting of the Paris Committee before the final version of the text was released, which they were told also includes a five-year review system to increase ambition and differentiation between countries as to their responsibilities for action.
If adopted at the talks, which have overrun their official Friday deadline, the deal will be the world's first comprehensive climate agreement with all countries taking action to tackle the problem.