The rapid growth of urban【11】will put heavy pressure on public health, fresh water, medical care, food supply, housing, transpor

The rapid growth of urban population will put heavy pressure on public health, fresh water, 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 land. The ever-increasing serious air and water pollution will damage crops considerably. All these will form more obstacles to the development of agriculture.