Almost 200 countries have agreed to the terms of a new international deal to tackle climate change following United Nations talks in Paris.
Cheers and applause broke out as the agreement - which includes a pledge to keep temperature rises "well below" 2C - was officially passed.
Prime Minister David Cameron said the deal had "secured our planet for many, many generations to come."
Barack Obama has said almost 200 countries "came together around the strong agreement the world needed" in agreeing a deal on climate change.
The US President said no agreement was perfect, including the Paris accord.
But he added that it was the best chance to save the planet.
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.