المستخلص: |
Since 1980 to 2010 the world urban population increased from 1.6 billion to 3.3 billion and it is expected to increase by another 2 billion by 2040 which means that the world is urbanizing rapidly, most of this urbanization takes place in the developing countries as the developed countries which went through this phase during the industrial revolution in the 19th and the early 20th century. This demographic transition, the migration from rural to urban areas helps in economic development where all the economic activities are geographically concentrated but this is not the case in developing countries where poverty increased, bad housing and infrastructure conditions and slums increased. This lead to the expansion of urban areas to cover the overpopulation by roads ,water and sanitation, as well as increasing pollution due to the transportation machines and plants which produce and increase costs on the developing countries that are not welcomed.
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