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A decade later, the world has a few somewhat smart cities

Shanghai. Photo: Artur Widak/NurPhoto/Getty

One of the most over-used slogans of recent years has been "smart cities," the vision of connected, Jetsons-like future of streamlined metropolises where technology smoothly manages energy use, traffic, policing and more.

Even so, a decade after the term first gained currency, we still have no truly smart cities, says McKinsey Global Institute in a new study of 50 selected cities around the world.