Chinese Premier Wen Jiabao left Beijing for the climate summit in Copenhagen, Denmark on December 16, when pessimism and disappointment were simmering among negotiators, who, after about 10 days' bargaining, found a bridge to span their rift seemed a mission impossible.

"It will be a tough task. Now I can feel how heavy my duty is to attend the meeting on behalf of the Chinese government," Wen told reporters aboard his plane en route to Copenhagen.

Chinese Premier Wen Jiabao speaks at the leaders' meeting of the United Nations Climate Change Conference in Copenhagen, Denmark, December 18, 2009. [Xinhua]

Nevertheless, Wen said he was confident that the talks would bear fruit. "As so many world leaders are gathered there, I believe there should come some achievements," he said. "No matter what the result is, China's action plan will not change, its voluntary reduction target will always be non-negotiable, and its determination in hitting the target will never waver."