Soon more than 550 cities worldwide will have a population of more than one million. In 2030 eighty percent of the world’s population will live in cities. Megacities have traditionally been economic and political power centers but today the fastest growing cities are in developing nations. The new challenge is that cities are growing helter skelter rather than planned. There is an acute need for new models of city planning to prevent collapses under such huge social, economic and environmental pressure. If cities are to remain livable, the problems of population increase must be understood and dealt with. Cities on Speed includes Bogota: Improving Civic Behavior (DVD 9193); Cairo: Garbage (DVD 9192); Mumbai: Traffic (DVD 9194); and Shanghai: Space (DVD 9191).