The world has been steadily getting more urbanized. According to the United Nations, the world’s urban population has increased from 746 million in 1950 to 3.9 billion in 2014, and is projected to reach 6.4 billion in 2050. About 55 percent of the world’s population lives in urban areas today, and that proportion is expected to increase to 66 percent in 2050.

Tokyo in 2014 remained the world’s metropolitan area with 38 million inhabitants, followed by Delhi with 25 million, Shanghai . . .

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