U.S. President Barack Obama told an unprecedented gathering of world leaders in Paris that talks in the French capital could help deliver a lasting global climate deal.
He told the assembled leaders and national delegations that no nation was immune to the effects of climate change, and said "nothing will deter us" from building a sustatainable future.
He told the conference that the U.S. will reduce emissions significantly below 2005 levels within the next 10 years.
Hailing the role of business, entrepreneurs and new technologies in the search for a solution, Obama said that strong growth and a safer environment can work in concert.
He was followed on stage shortly afterwards by Chinese President Xi Jinping, who said his country would move to cut CO2 emissions even further that the U.S., talking of cuts of 30 percent to 35 percent.
He too exhorted the assembled delegates to come together and find a workable deal. "Tackling climate change is a shared mission for all mankind. All eyes are now on Paris," Xi said.