Danish Prime Minister Lars Lokke Rasmussen (R) and Yvo de Boer, executive secretary of the United Nations Framework Convention on Climate Change, attend the opening of the United Nations Climate Change Conference 2009, also known as COP15, at the Bella center in Copenhagen December 7, 2009. [Xinhua]

Rajendra K. Pachauri, chairman of the Inter-governmental Panel on Climate Change, addresses the opening of the United Nations Climate Change Conference 2009, also known as COP15, at the Bella center in Copenhagen December 7, 2009. [Xinhua]