Futureproofing cities

American City and County: Cities take up 2 percent of the earth’s surface, but they account for 60 to 80 percent of energy consumption and 75 percent of carbon emissions. More than half of the world’s population lives in cities, and that number is expected to grow to 75 percent by 2050. Anticipating that unprecedented growth, city planners are looking to "future proof" cities to provide for a more sustainable future.

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