What Life Will Be Like in the Cities of the Future

Time: According to the World Health Organization, the number of people living in cities is expected to almost double over the next few decades, from 3.4 billion in 2009 to 6.4 billion in 2050.  And urban centers have to get a lot more efficient — in terms of energy use, food consumption, traffic management and more — to accommodate that influx. But how?

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