College students display boards, forming CO2, or carbon dioxide, in a "green walk" rally in Chongqing December 7, 2009 to promote public awareness of reducing pollution as delegates from 190 nations descend on Copenhagen for the UN climate change conference. More than 50 students from nine colleges in the inland municipality walked over four hours before they arrived at the rally square, canvassing along the way and handing out leaflets on carbon reduction. The words on their T-shirts read "Cut One Kilogram Carbon for Copenhagen". [CFP]
