Buildings, for example, are responsible for 40 percent of the world's energy consumption, making them an obvious target for cities that aim to reduce their carbon footprint. Buildings are ready for the age of smart cities, with an expanding web of development: green roofing, combined heat and power, solar tech and much more.
Smart technology can also make living better at the personal level. Smartphone apps give a direct link between citizens and public administrators. They may provide maps of subways and bus routes and even help people find the nearest parking space or ride sharing opportunities.