By 2050, it's predicted that 70 percent of the world's population will according to the Institute for Economics & Peace.The status is typically given to a city with a population of more than 10 million - which are often beset with problems such as pollution, congestion and overcrowding. There are currently 33 such cities in the world, the biggest being Tokyo, with a population of 37.3 million. A total of 19 of the world's current mega-cities are located in .
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