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当代世界各国面临着人口、资源和环境方面的严重危机。在资源危机中,水的危机头等重要。如今全球有不少地方出现水荒。很多国家为了生活的需要和发展经济的需要,不惜代价开发水资源。然而他们常常忽略了水资源是同其他自然要素相互关联着的,在开发水资源的同时,人为地破坏了自然界的水循环过程,引起水资源同其他自然要素之间的平衡发生改变。结果是用水的需求一时满足了,水资源开发的遗患则影响几十年甚至贻害几代人,迫使人们不得不用高出开发水资源若干倍的代价去解决新出现的环境问题。在水资源开发规模不大时,这种恶果并不明显。但随着近代工业的兴起
All countries in the contemporary world are facing serious demographic, resource and environmental crises. In the resource crisis, the crisis of water is of paramount importance. There are many places in the world where water shortages occur today. In order to meet the needs of life and economic development, many countries develop water resources at any cost. However, they often overlook the fact that water resources are interrelated with other natural elements. Water resources are exploited at the same time as the water cycle in nature is artificially destroyed, causing a change in the balance between water resources and other natural elements. As a result, the demand for water has been met for a while. The legacy of water resources development has been affecting generations of people for decades or even forcing generations to force new and emerging environmental problems at a cost several times higher than the cost of developing water resources. In the small scale of water resources development, this evil is not obvious. But with the rise of modern industry