Huddling with Xi on the sidelines of the Paris climate conference, Obama said nowhere had coordination with Beijing been more critical or more fruitful than on climate change. He credited US and Chinese leadership with leading 180 nations to make their own pledges to curb emissions in the run-up to the Paris talks.
"Our leadership on this issue has been absolutely vital," Obama said.
The United States has complained bitterly about cyber-attacks against the US emanating from China, and Obama has spoken out regularly against China's assertive moves in disputed waters in the East China Sea and South China Sea.
Yet Obama said the US and China had developed a "candid way of discussing these issues," adding that he hoped to build on that tradition during his meeting with Xi.
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The Chinese leader described climate change a huge challenge. Speaking through a translator, he called for the US and China to build a new model of cooperation, using diplomatic language long preferred by Beijing.
China emits about 30 per cent of the world's greenhouse gases and the US about 16 per cent.
Both countries have sought to use their cooperation on the issue to ramp up pressure on developed and developing countries alike to pledge ambitious cuts. In a joint announcement last year, Obama pledged to cut US emissions up to 28 percent over the next decade, while Xi announced China would cap its growing emissions by 2030 or sooner.
While in Paris, Obama also is trying to drown out his critics at home who say his energy plan is unattainable and could be wiped away by his successor.