Cities are big magnets for talent and investment, so it's no surprise that they've become the world's main economic engine, creating more than 80% of global GDP and assisting hundreds of millions of people to rise out of poverty. However, the rapidity and size of urbanization pose significant obstacles. Widening wealth disparities, rising pollution, and deteriorating buildings and bridges are all evidence that today's cities are failing to keep up with residents' growing hopes for a sustainable and prosperous future.
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Energy Information Administration NRDC Sterling Environmental Protection Agency