Cities have great advantages. They provide good jobs and are the most efficient form for delivery of services such as waste disposal, power, education, fire protection, and transportation, when compared with rural areas. City dwellers also use less energy than their counterparts in the countryside. Many experts envision that cities of the future will utilize more sustainable water, waste, energy, and transportation infrastructures. But what will drive the innovation needed to create these cities? And what role will government, industry, and NGOs play in bringing about this change? On November 8, 2012, the ELI—Miriam Hamilton Keare Policy Forum hosted a panel of experts to discuss the future of sustainable cities.