Volunteers ride bicycles in Jinan, capital of east China`s Shandong province, Jan. 9, 2010. Some 200 citizens and volunteers called for reducing carbon emissions by taking part in an activity of riding bicycles in Jinan on Saturday. (Xinhua/Zhu Zheng)

Volunteers show a flag with their signatures in Jinan, capital of east China`s Shandong Province, Jan. 9, 2010.(Xinhua/Zhu Zheng)

Volunteers pose for photos with their bicycles in Jinan, capital of east China`s Shandong Province, Jan. 9, 2010.(Xinhua/Zhu Zheng)