A giant model of the earth is illuminated by electricity generated by people's riding bicycles in front of the city hall of Copenhagen, Denmark, December 7, 2009, on the occasion of the United Nations Climate Change Conference (COP15). [Xinhua]

Bicycles are displayed for free usage outside the Bella Center, venue of the 15th United Nations Climate Change Conference (COP15), in Copenhagen, capital of Denmark, December 8, 2009. Varaious environmental-friendly features could be seen in and outside the Bella Center as the host promised to turn the COP15 into a green conference. [Xinhua]