US President Barack Obama has praised the climate deal agreement as “ambitious” and “historic”.
President Obama also warned against complacency.
“Together, we’ve shown what’s possible when the world stands as one,” he said.
And although admitting that the deal was not “perfect”, he said it was “the best chance to save the one planet we have”.
China’s chief negotiator Xie Zhenhua said the deal was not perfect. But he added that “this does not prevent us from marching historical steps forward”
The pact is the first to commit all countries to cut carbon emissions.
The agreement is partly legally binding and partly voluntary.
Earlier, key blocs, including the G77 group of developing countries, and nations such as China and India said they supported the proposals.
President of the UN climate conference of parties (COP) and French Foreign Minister Laurent Fabius said: “I now invite the COP to adopt the decision entitled Paris Agreement outlined in the document.