An arch stands on a road in Dingxi, Gansu Province. Above the arch features the slogan "Dingxi immigrants welcome you," flanked by two vertical slogans "Unite villages and households for common prosperity" and "Make a solid foundation for the well-being of the people". With desertification approaching faster every year, people living in the central areas of Gansu Province, like Dingxi, face a new round of immigration.