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The megacity is a term used when the population in a city is more than 10 million people. At the outset of the twentieth century, 10% of the population lived in cities. Later in 2000, around 50% of the world population lives in cities. In 2025, the number of city-dweller could reach 5 billion people (two-thirds of thirds of them in developing countries). Out of 30 megacities, 17 are Asians, 5 Europeans, 6 Americans (both south and north) and finally 2 Africans. At the beginning of the twentieth century, 10% of the world’s population lived in the city’s, a century later more than 50%. See less–developed countries

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