The survival of our species on planet earth is largely going to be determined by what happens in our cities. By 2050, 70% of the world's population will live in them. We are observing a mass migration to cities at an unprecedented rate. The growing urbanization places high demands on infrastructure such as transportation and building as well as increased demand for resources such as food, water, and energy. Global cities can not continue to sprawl as many U.S. cities did in the 20th century.
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