Detroit is a shrinking city, with just 700,000 residents in a place designed for two million. Many who still live there want to leave. But instead of trying to restore the Silicon Valley of the Jazz Age to its time of industrial greatness, civic leaders have another idea. The Detroit Future City report is hugely ambitious: showing a greener, healthier and more prosperous city — at Detroit's present size. Can the symbol of post-industrial ruin become a model for re-inventing not only Detroit but other failing cities in the Rust Belt, Florida and California?