这是发生在由于气候变化以及人们砍伐树木、开垦草地等使得陆地变成沙漠时的过程。
This is a process that happens when land becomes desert because of climate changes and because people cut down trees and dig up grass.
自然界正遭到诸如人口增长、污染、大肆砍伐树木等的威胁。
Nature is reeling from such threats as population growth, pollution and deforestation.
我们必须禁止砍伐树木，禁止捕杀动物，禁止把废水倒入河流等。
We must forbid cutting down trees and forbid killing animals and pouring waste water into rivers and so on.
我们必须禁止砍伐树木，禁止捕杀动物，禁止把废水倒入河流等。
We must forbid cutting down trees and forbid killing animals and pouring waste water into rivers and so on.
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