The Inner Mongolian Plateau,to the north of Beijing,used to be the source of the windblown sandstorms that were rampant in the Beijing-Tianjin-Hebei region each spring.But now,over 700-square-km of trees,called Saihanba,has formed a green wall 450 km from Beijing,saving the capital from being buffeted by wind and sand.This green barrier is not a natural phenomenon but the result of 55 years of manmade afforestation.The forest lies close to sandy land on the plateau.Fifty-five years ago,it was wasteland with scattered yellow
展开▼
