A breeder walks Tan sheep to improve mutton quality at a farm in Yanchi County, northwest China's Ningxia Hui Autonomous Region, May 27, 2019. Located on the southern edge of the Maowusu Desert, Yanchi County was once poverty-stricken and suffered from desertification. But after years of efforts, the environment there has been restored, and the county has also shaken off poverty. (Xinhua/Wang Peng)