The history and future of the city

By most accounts, the first cities sprang up in Mesopotamia and Central America around 7000 BC. Fertile soils and successful agricultural developments made it possible for people to live together in close proximity and to focus on things other than food production. But what can we learn from cities now? Wendy Pullan and Joanna Kusiak join Ed Kessler to discuss the past and the future of cities...