More than half of all humans will soon be living in cities, according to a prediction by the United Nations. Psychologically it is an important step for mankind, Hania Zlotnik,...

More than half of all humans will soon be living in cities, according to a prediction by the United Nations. "Psychologically it is an important step for mankind," Hania Zlotnik, director of the United Nations Population Division, the BBC reports:

Despite almost four millennia as centres of civilisation, it was only fairly recently that cities attracted more than a small percentage of the global population. With hindsight, the 20th Century was the century of urbanisation.

In 1900, only 14% of humanity lived in cities. By the century’s close, 47% of us did so. This change is revealed in the growth of the number of medium-sized cities. In 1950, there were 83 cities with populations exceeding one million; but by 2000, this had risen to 411.

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