Global trends, found that the people living in the more urban areas as a priority. The rise of the world's population are the main factors causing migration from the countryside into the city at the current population is approximately 3,500 million people around the world, representing half of the world population lived in urban areas, and the expectation in the 1976 2593 (1990 ๒๐๕๐) No. 70 percent of the world's population will live in all of the urban areas.
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