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Smart cities are popping up around the globe, from China where 193 smart cities are being piloted, to Europe, the U.K. and the U.S. Their development involves a wide scope of technology, everything from renewable energy, green buildings and smart grids to traffic management, urban security and medical technology. The goal: urban sustainable development and economic growth. Opportunities abound to be part of this global urban revitalization effort. The question is, at what cost to participants?