The General environmental problems of cities of the world.

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The General environmental problems of cities of the world.

Environmental problems of cities, mainly largest of them, are connected to excessive concentration in rather small territories of the population, transport and the industrial enterprises, with formation of the anthropogenous landscapes very far from a condition of ecological equilibrium. Rates of growth of a world's population at 1.5-2.0 time are lower than growth of urban population to which today concerns 40 % of people of a planet. For the period 1939 - 1979 the population of large cities has grown in 4, on the average - in 3 and small - in 2 times.

Social and economic conditions has resulted in uncontrollability of process of a urbanization in many countries. The interest of urban population is equal the separate countries: Argentina - 83, Uruguay - 82, Australia - 75, USA - 80, Japan - 76, Germany - 90, Sweden - 83. Besides large cities - millionaires city agglomerations or the merged cities quickly grow. Are those Washington - in USA; cities of Ruhr in Germany; Moscow, Donbass and Kuzbass in the CIS.

Circulation of substance and energy in cities considerably surpasses those in a countryside. Average density of a natural stream of energy of the Earth - 180 Â

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