Yak roam on the grassland along a river in Madoi county, Northwest China's Qinghai province, Aug 10, 2011. The ecological environment has been greatly improved thanks to measures including returning grazing land to grassland, ecological migration, and artificial precipitation. [Photo/Xinhua]

The look of Dengba new village of Zhiping county after environment remediation, Guangxi Zhuang autonomous region, Sept 4, 2012. [Photo/Xinhua]