应该是土地沙漠化Desertification
Land desertification can develop so fast, the main reason is the devastation of forest vegetation by human.土地沙漠化之所以迅速发展,主要原因是人类对植被的破坏.
A number of solutions have been tried in order to reduce the rate of desertification and regain lost land.
人们已经尝试了很多方法来降低土地沙漠化的程度和恢复已失去的土地.