Researchers from Beijing Forestry University Qiao Yangui, Miao Chun and Bai Yuxuan (L-R) install experimental equipment at an observation station in Yanchi, 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/Zhang Chencen)