The Paris climate change deal would be a "major leap for mankind", French President François Hollande has said.
Mr Hollande said the world was at a "decisive moment in time" and that global warming beyond the target outlined in the draft deal could have a "very serious impact" on the planet.
He told the conference: "We have to take that last step.
"This will be a major leap for mankind.
"You have to take this opportunity, grasp it, so that our planet may live a long time, that we may live a long time."
The full text of the draft deal will be released on Saturday afternoon before it is agreed on.
George Osborne was warned he could be breaking law with cuts to investment in renewable and green energy
Prime Minister David Cameron has welcomed the final approval on an historic international deal to tackle climate change.
WWF-UK's chief executive, David Nussbaum, writes for ITV News after the release of the final draft of the Paris Agreement on climate change.