Bloomberg: Dust storms and desertification are two of Chinas biggest environmental challenges, and they cant be addressed without dealing with the stressed northern region of Inner Mongolia. Years of intensive agriculture, the ravages of open-pit coal mining, and climate change have depleted the scarce water resources of the already arid territory. Its grasslands are disappearing and lakes are drying up. Chinas response includes the Great Green Wallplanting vast numbers of trees to form a protective belt...