Urban Green explores new and innovative ways for "built out" cities to add much-needed parkland. After first exploring the question of why urban parks are needed, Peter Harnik looks at how much parkland is truly possible and where specific investment can go. Among the book's many examples and practical solutions are reusing the land from defunct factories to sharing schoolyards, from decking parks over highways to allowing more activities in cemeteries, from eliminating parking lots to uncovering buried streams, and more. While no strategy alone is perfect, and each has its own set of challenges, collectively they suggest a path toward making cities more beautiful, sociable, fun, ecologically sound, and successful.