The authors of this spirited book don't believe that oblivion is necessarily the destiny of urban areas. Instead, they believe that intelligent planning and visionary leadership can help cities meet the impending crises, and look to existing initiatives in cities around the world. Rather than responding with fear (as a legion of doomsaying prognosticators have done), they choose hope. This is not a book filled with "blue sky" theory (although blue skies will be a welcome result of its recommendations). Rather, it is packed with practical ideas, some of which are already working in cities today. It frankly admits that our cities have problems that will worsen if they are not addressed, but it suggests that these problems are solvable. And the time to begin solving them is now.