Four students carry a special boat named "Simida" made of 1,504 empty plastic beverage bottles to a lake for its maiden voyage at Chongqing University of Science and Technology in Southwest China's Chongqing municipality, Sept 14, 2011. It took the four students two months to make the boat which is 4.48 meters by 1.3 meters and weighs 58.2 kilograms. The maiden voyage lasted about 20 minutes with plenty of students witnessing the occasion. Tang Ming, one of the four students, said they made the boat with an aim to promote the concept of environmental conservation.[Photo/CFP]

The four student boat makers row their boat made of 1,504 empty plastic beverage bottles on a lake at Chongqing University of Science and Technology in Southwest China's Chongqing municipality, Sept 14, 2011. [Photo/CFP]