By 2050, as many as seven out of 10 people on Earth will live in an urban area: https://t.co/zlZZOESlgc http://pic.twitter.com/Zo53EwUp7j — WSJ Think Tank (@WSJThinkTank) December 15, 2015
By 2050, as many as seven out of 10 people on Earth will live in an urban area: https://t.co/zlZZOESlgc http://pic.twitter.com/Zo53EwUp7j
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