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在人类赖以生存的地球上 ,水的储量极其丰富 ,但是人类可以利用 (生活饮用、灌溉、发电等 )的淡水仅占地球中水资源的 4 %。 2 0世纪末 ,由于全球变暖 ,生态环境遭到严重破坏 ,人类所需的水资源也频频告急 ,表现在城市供水、农田灌溉、水力发电、防止洪水和防止水污染五个方面
On the earth on which mankind depends, water reserves are extremely rich, but the freshwater that mankind can make use of (drinking, irrigation, power generation, etc.) accounts for only 4% of the earth’s water resources. As the end of the 20th century, due to the global warming, the ecological environment was severely damaged, mankind’s water resources are also frequently critical, manifested in five aspects of urban water supply, irrigation of farmland, hydroelectric power generation, flood prevention and water pollution prevention