By Catherine Bolgar
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By 2050, two-thirds of the world’s population will live in cities, the United Nations Human Settlements Program forecasts.
Meanwhile cities themselves are growing, with the number of megacities—those with populations greater than 10 million—expected to hit 41 by 2030, up from 28 today and just 10 in 1990.
The challenge is how to make sprawling, dense cities livable, sustainable and efficient for residents. But priorities for livability aren’t easy to define.
“If you have an older population, then things they see as priorities may be different than in a city with a huge number of young people,” says Stephen Hammer, manager of climate policy for the World Bank Group in Washington, DC.
