We take big cities for granted today, but they are a relatively recent phenomenon. Most of human history concerns rural people making a living from the land. But the world is rapidly urbanizing, and it's not at all clear that our planet has the resources to cope with this relentless trend. And, unfortunately, most of the growth is occurring in urban centers ill-equipped for the pace of change. You've heard of the "birth dearth"? It's bypassing Dhaka, Mumbai, Mexico City and Lagos, cities that are adding population as many of their western counterparts contract.
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