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The sharp expansion of cities, the rapid growth of population and the shift of a large rural population into cities and towns, will make the urban areas unimaginably expanded and crowded.
The rapid growth of urban population will put heavy pressure on public health, fresh water supply, medical care, food supply, housing, transportation and employment, and also bring about some vicious social problems.
In the meantime, the urban and township development will cause more loss of fertile farmland. The ever-increasing serious air and water pollution will damage crops. All these will form more obstacles to the development of agriculture.
The increasing shortage of resources on earth is also a major problem that cannot be ignored. It seems that the solution to the problem concerning the extremely rapid growth of population is a difficult and pressing task facing all the people in modern society.
