the damages to the ozone layer 臭氧层破坏

the deterioration of the ecosystem 生态恶化

the extinction of bio－species 物种灭绝

environmental degradation 环境恶化

environmental deterioration 环境恶化

grassland degradation 草场退化

emission of pollutants 污染物排放

the green－house effect 温室效应

to prevent and treat pollution 污染防治

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