Experts have called on the US and China to narrow their differences in a bid to ensure the conference is a success.

Experts played down the likelihood of the world achieving an ambitious global treaty in Copenhagen but said Wen will defend China"s status as a developing country and protect its right to economic expansion in the future.

Jiang said the summit has seen both conflicts and achievements.

She said the main stumbling block to real progress has been the reluctance of developed nations to hand over funding and technical support to developing nations that they promised in earlier agreements.

"If they abandon the principles of the Bali Road Map and the Kyoto Protocol, it will have a negative impact and hamper the conference," Jiang said.