A volunteer tells pupils the harm of the discarded plastic in a school in Liaocheng, east China's Shandong Province March 15, 2006. Environmental problems have become a main bottleneck in China's fast-growing economy.

Pupils learn about the harm of the discarded batteries from a volunteer in a school in Liaocheng, east China's Shandong Province March 15, 2006. Environmental problems have become a main bottleneck in China's fast-growing economy.

(China Daily March 16, 2006)