The world’s large cities will pose our greatest challenge—and greatest opportunity—in the next century. Today there are 21 “megacities” with more than 10 million people, and more than 1 million people move to cities every day. By 2050, 70 percent of the world’s population will call a major city home. But today, cities waste an estimated $39 billion in water, waste, gas and energy resources. As demands on resources and infrastructure grow, how will cities provide energy, water, transportation and other critical services for so many people?

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