The Shang family, from Zhumadian of Central China`s Henan province, recycles steel bars at a demolition site in Jinan, the capital of East China`s Shandong province, Aug 8, 2011. As many urban Chinese children are enjoying cool air conditioners, 8-year-old Shang Guangwei and his 11-year-old sister are spending their summer vacation at construction sites, recycling waste iron and steel with their migrant parents. Each day, their mother would use a metal detector to find metal and their father would then try to dig out what was seen as treasure to the family. Shang and his sister would help carry some tools and collect the metal that was found. [Photo/CFP]

The Shang family, from Zhumadian of Central China`s Henan province, recycles steel bars at a demolition site in Jinan, the capital of East China`s Shandong province, Aug 8, 2011. [Photo/CFP]

Shang Guangwei, 8, from Zhumadian of Central China`s Henan province, collects steel bars at a demolition site in Jinan, the capital of East China`s Shandong province, Aug 8, 2011. [Photo/CFP]

Shang Guangwei, 8, from Zhumadian of Central China`s Henan province, collects steel bars at a demolition site in Jinan, the capital of East China`s Shandong province, Aug 8, 2011. [Photo/CFP]

Shang Guangwei, 8, from Zhumadian of Central China`s Henan province, carries steel bars collected from a demolition site in Jinan, the capital of East China`s Shandong province, Aug 8, 2011. [Photo/CFP]