For residents of European cities—with their snarled traffic, drafty old buildings, creaking public services and gray winters—it's easy to see the appeal of moving to a brand-new, high-tech metropolis.

Smart city innovation is accelerating—so fast, in fact, that distant visions of the future are now becoming present-day realities, transforming how communities live, work and play. At the heart of ...

Forbes contributors publish independent expert analyses and insights. Dianne Plummer is an Energy Consultant and Certified Energy Manager. Since 2011, the Smart City Expo World Congress has stood as ...