新航道济南雅思培训整理了雅思作文写作的素材，同学们可以再该段落内容中选部分或全部，作为人类对环境改变的理由。中国雅思网m_A^gtF3A5O
中国雅思网 /V D}    Everywhere man is altering the balance of nature. He is facilitating the spread of plants and animals into new regions, sometimes deliberately, sometimes unconsciously. He is covering huge areas with new kinds of plants, or with houses, factories, slag-heaps and other products of his civilization. He exterminates some species on a large scale, but favours the multiplication of others. In brief, he has done more in five thousand years to alter the biological aspect of the planet than has nature in five million.

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