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In 1950, New York and Tokyo were the only so-called megacities,

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cities with more than 10 million inhabitants.

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By 1980, these were joined by Mexico City, Sao Paulo and Osaka.

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In 2010, there were over 20 megacities spanning almost every continent.

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Today, there are 32 megacities.

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Urbanization is happening faster than at any time in human history.

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Asia accounts for over half of today's megacities.

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By 2030, nearly 9% of the world's population will live in 41 megacities.

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But it's in Africa where some of the most rapid urbanization will take place in the future.