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There were emotional scenes at the Paris climate talks as nearly 200 nations finally agreed a deal to attempt to keep temperature rises "well below" 2C.
That excitement was understandable given the historic deal has been 20 years in the making:
Video report by ITV News science correspondent Alok Jha.
The US president has welcomed the Paris climate change agreement, saying it demonstrated "what's possible when the world stands as one".
Barack Obama emphasised the US role in the developments that led up to the Paris agreement, including the US role in the earlier 2009 Copenhagen talks, but said the Paris agreement had only been achieved because nations came together.
"Today the American people can be proud because this historic agreement is a tribute to American leadership. Over the past seven years, we've transformed the United States into the global leader in fighting climate change," Obama said.
He said the agreement was not perfect, but that it "establishes the enduring framework" to solve the climate crisis.
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.
Labour leader Jeremy Corbyn has welcomed the historic climate change deal agreed in Paris - and said he hopes it will prompt the government to reverse cuts to clean energy.
Accusing Prime Minister David Cameron of "taking us backwards on climate change action", Mr Corbyn said the challenge now was to turn the words of the agreement into action.
The Paris climate change agreement is historic in its ambition to take action against the worldwide threat of global warming. It represents a victory for the international movement for climate change action and global justice.
The challenge now is to turn the Paris agreement’s fine words into the strong action the planet and its people need.
The Labour Party will do everything we can to ensure Britain takes a leading role in making these aspirations a reality.
The Prime Minister has so far failed to show the leadership this agreement demands. In fact, the government has been taking us backwards on climate change action, including by cutting support for feed-in tariffs and the solar industry.
David Cameron must now take his cue from Paris, reverse his government’s cuts to clean energy and put real investment in the green jobs of the future.
The Friends of the Earth chief executive has warned the deal fell far short of the "soaring rhetoric" from 150 world leaders who attended the opening day of the talks.
An ambition to keep global temperature rises below 1.5C is all very well, but we still don't have an adequate global plan to make this a reality. This agreement leaves millions of people across the world under threat from climate-related floods, droughts and super-storms.
However, this is still a historic moment. This summit clearly shows that fossil fuels have had their day - and that George Osborne's outdated, backward energy policies must be reversed if he wants to be on the right side of history.
There are tears and smiles as the climate change deal was agreed in Paris, ITV News Science Correspondent Alok Jha reports.
The International Monetary Fund chief has hailed the landmark agreement reached in Paris "a critical step forward" for addressing global climate change in the 21st century and said her key message is to "price carbon right."
Governments must now put words into actions, in particular by implementing policies that make effective progress on the mitigation pledges they have made.
Charging for the emissions of fossil fuels puts in place the needed incentives for low-carbon investments; it also provides revenues to safeguard the poor, reduce debt, and lower the burden of other taxes on households and businesses.