2030: How 4 smart cities are gearing up for the future — mashable.com

While the future (as a whole) is very much unwritten, the future of what our urban centers will look like is less uncertain. We can assume, to a degree, that they'll become more crowded and, as a result, more prone to delays as time goes on; 75% of the world's population, in fact, is expected to reside in cities by 2050, putting more stress on already overburdened urban infrastructure and public transportation systems.

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