Megacities are usually defined as a metropolitan area with a total population in excess of 10 million people.Some definition also set a minimum level for population density(at least 2000 person/square km). Megacities can be a single metropolitan area that converge.Megacities are characterized by global connectedness and local disconnectedness.Some example of mega cities are Tokyo,New York City, Los Angeles and Mumbai.Examples of megacities Environmental Challenges is regional and even the global population in jeopardy.The cost in terms of impairment of health,reduced productivity and others fall disproportionately on the poor.
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