"China's top weather scientist has made a rare official acknowledgement: climate change, he says, could have a "huge impact" on the country's crop yields and infrastructure."

"Zheng Guogang, the head of China's meteorological administration, tells Xinhua news agency that China is already experiencing temperature increases that outpace those in other parts of the world."

"As a result, China — the world's biggest emitter of greenhouse gases — faces a possible "ecological degradation," he says."

"'As the world warms, risks of climate change and climate disasters to China could become more grave,' Zheng said."