可持续发展英语演讲(5)

The agricultural civilization — Transformation of natureInto agricultural civilization, humans began large-scale transformation of nature, development and utilization of land, water, climate and other resources. Farming techniques have been developed,The food supply becomes stable, the population began to grow rapidly. At the same time, a large area of forests and grasslands have been cut down and burned, smelting and ceramics also cost a lot of wood. Agricultural extension also enables reduction of biodiversity, ecosystems become increasingly simple and fragile. During this period, mankind has not correctly understand the disharmony between people and land, can only be mechanically migration, in order to evade the natural punishment.

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