Children make a sedan chair made of wasted materials with their teacher at a kindergarten in Yuezhuang Town of Yiyuan County, east China's Shandong Province, May 24, 2013. Children here use waste materials to make toys to celebrate the coming Children's Day in a low-carbon way. (Xinhua/Zhao Dongshan)

Children play with a sedan chair made of wasted materials at a kindergarten in Yuezhuang Town of Yiyuan County, east China's Shandong Province, May 24, 2013. Children here use waste materials to make toys to celebrate the coming Children's Day in a low-carbon way. (Xinhua/Zhao Dongshan)

A child creates a painting with discarded wool and cotton at a kindergarten in Yuezhuang Town of Yiyuan County, east China's Shandong Province, May 24, 2013. Children here use waste materials to make toys to celebrate the coming Children's Day in a low-carbon way. (Xinhua/Zhao Dongshan)

A child creates a painting with discarded wool and cotton at a kindergarten in Yuezhuang Town of Yiyuan County, east China's Shandong Province, May 24, 2013. Children here use waste materials to make toys to celebrate the coming Children's Day in a low-carbon way. (Xinhua/Zhao Dongshan)

Children make figurines with mud at a kindergarten in Yuezhuang Town of Yiyuan County, east China's Shandong Province, May 24, 2013. Children here use waste materials to make toys to celebrate the coming Children's Day in a low-carbon way. (Xinhua/Zhao Dongshan)

A child builds a tower with corncobs at a kindergarten in Yuezhuang Town of Yiyuan County, east China's Shandong Province, May 24, 2013. Children here use waste materials to make toys to celebrate the coming Children's Day in a low-carbon way. (Xinhua/Zhao Dongshan)

Children build towers with corncobs at a kindergarten in Yuezhuang Town of Yiyuan County, east China's Shandong Province, May 24, 2013. Children here use waste materials to make toys to celebrate the coming Children's Day in a low-carbon way. (Xinhua/Zhao Dongshan)

Children play with toy guns made of corn stalks at a kindergarten in Yuezhuang Town of Yiyuan County, east China's Shandong Province, May 24, 2013. Children here use waste materials to make toys to celebrate the coming Children's Day in a low-carbon way. (Xinhua/Zhao Dongshan)

Children play with toy guns made of corn stalks at a kindergarten in Yuezhuang Town of Yiyuan County, east China's Shandong Province, May 24, 2013. Children here use waste materials to make toys to celebrate the coming Children's Day in a low-carbon way. (Xinhua/Zhao Dongshan)

Children create a painting with cereals and crop shells at a kindergarten in Yuezhuang Town of Yiyuan County, east China's Shandong Province, May 24, 2013. Children here use waste materials to make toys to celebrate the coming Children's Day in a low-carbon way. (Xinhua/Zhao Dongshan)

Children play in circles made of wasted beverage bottles at a kindergarten in Yuezhuang Town of Yiyuan County, east China's Shandong Province, May 24, 2013. Children here use waste materials to make toys to celebrate the coming Children's Day in a low-carbon way. (Xinhua/Zhao Dongshan)

 Children display a fish made of waste cloth at a kindergarten in Yuezhuang Town of Yiyuan County, east China's Shandong Province, May 24, 2013. Children here use waste materials to make toys to celebrate the coming Children's Day in a low-carbon way. (Xinhua/Zhao Dongshan)