几个世纪以来，人类过度砍伐树木及过度集约耕作，一直在破坏环境。
Humans have been damaging the environment for centuries by overcutting trees and farming too intensively.
如果把一大片土地 的树木全部砍伐掉，再加之农民耕作不当的话，那么风吹雨打就会逐渐地把大部分表层的肥 沃土壤吹走或冲掉。
If a large area of land is cleared of trees and bushes and is then badly treated by the farmer, the rain and winds may gradually wash away, or blow away, much of the fertile top-soil.
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