Last summer, I wrote a story for Outside Magazine on the transformation of abandoned oil plants, railroad yards, even elevated railroad lines (the High Line Park in Manhattan) into popular urban parks. Now The Trust for Public Land’s Peter Harnik has written a book on the subject called “Urban Green: Innovative Parks for Resurgent Cities.” A must read for any urban visionary, the book not only delves into examples, but is a primer on how to create parks from space that not long ago was thought of as unusable. Grab lunch at Chelsea Market and have a picnic on the High Line, like I recently did, and you realize the brilliance of this concept.