The document discusses energy management and sustainability in cities. It provides examples of cities around the world that are transitioning to more sustainable practices in response to issues like peak oil and economic crises. Cities discussed include Vancouver, which uses hydroelectric power; Florida's planned first solar-powered city; and Masdar City in Abu Dhabi, which aims to generate more energy than it uses. International collaborations on green building are also mentioned. The conclusion emphasizes that a transition is needed away from oil-dependent infrastructure as global oil production peaks.