Most rooftop gardens with a touch of green are basically just sedum mats on a bit of soil. But now, designers are stepping up their game, crafting super cool green roofs that tackle not just eco stuff like heat and storm management, but also focus on making the rooftop a stunning, livable, and sustainable space. The Professional Design Guide to Green Roofs is packed with awesome photos, examples from around the globe, and practical how-to tips for all you design pros out there.