A Change in Worlds explores the environmental, economic, and political history of the Sino-Tibetan Songpan region of northern Sichuan from the late imperial Qing Dynasty to the early 21st century. A historically Tibetan region on the eastern edge of the Tibetan Plateau, with significant Han and Muslim Chinese populations, Songpan played important roles in the development of western and modern China’s ethnic relations policies, forestry sector, grasslands and environmental conservation, and...