UN Secretary General Ban Ki-moon has said there can be no global climate change deal without China's support.
Speaking in Beijing, he also praised China's efforts so far to promote sustainable economic growth and develop renewable energy sources.
Experts say China has already committed itself to reducing carbon dioxide emissions - a driver of global warming.
World leaders hope to produce a new agreement to tackle climate change at a meeting in Copenhagen in December.
Mr Ban was speaking at a UN-backed event in Beijing to promote the use of energy-saving lamps across China.