Danish Prime Minister Lars Lokke Rasmussen is seen during a night plenary session at the United Nations Climate Change Conference in Copenhagen, capital of Denmark, December 19, 2009. [Xinhua]

Yvo de Boer (1st L), executive secretary of the United Nations Framework Convention on Climate Change, and UN Secretary-General Ban Ki-Moon (2nd L) are seen during a night plenary session at the United Nations Climate Change Conference in Copenhagen, capital of Denmark, December 19, 2009. [Xinhua]