"Cancun is an important stop in the international process of dealing with climate change," China's chief climate negotiator Su Wei said.

China will continue to "stick to the UN Framework Convention on Climate Change, the Kyoto Protocol and the Bali Roadmap" and hopes that the latest meeting will build on past achievements and yield positive results in all relevant fields, Su, head of the climate change department of China's National Development and Reform Commission (NDRC), told the official Xinhua news agency.

Particularly, he said, Beijing expects the conference to "bear real fruits" on the key issues of mitigation, adaptation, financial support and technology transfer and thus lay a solid foundation for future negotiations and the final achievement of a legally binding treaty.

Noting that climate change will never be a simple issue and that the latest conference will not be easy in view of the bitter debates at previous sessions, Su stressed that China will play an active and constructive role and help bring the Cancun talks to a fruitful end.

He said the developed countries should take major responsibility for climate change and shoulder due obligations as the unrestrained emission during their 200-year industrialisation process was largely to blame for the global warming.

Yet all the countries are subject to the negative impact of climate change, and thus share a common responsibility to take concerted actions to deal with the global problem, he added.

About 25,000 officials, researchers, entrepreneurs and activists from 194 countries have gathered in the Mexican resort city for the conference, with the hope of reaching a legally binding treaty to replace the expiring Kyoto Protocol.

In order to make headway, the participants in the conference should keep a flexible attitude, Su said.

"I am against bargaining over the climate change issue.

Each party should be clear about its duty and try its best to handle the grave challenge to the entire mankind on the basis of its own capability," he said.