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Mention the word greento an architect or builder, and talk turns to environmental awareness, energy conservation, and sustainable design. Green roofs, typically made up of a thin layer of soil planted with a hardy groundcover, are relatively new to the United States but have proven their feasibility in Europe. When the American Society of Landscape Architects (ASLA) decided to retrofit a green roof atop its Washington, DC, brownstone headquarters, it partnered award-winning landscape architects Michael Van Valkenburgh Associates with the Conservation Design Forum. The 3300-square-foot, ecologically sound and graciously inviting gardenlike result now serves as an ASLA green-roof case study and is featured in programs to educate and inspire clients and designers. Author and landscape architect Werthmann (Harvard Univ.) presents an exhaustive rooftop tour in a novel encyclopedia format. Generously illustrated entries span the A to Z of green-roof design and construction, including drainage, erosion, maintenance, and planting. Along with Nigel Dunnett and Noel Kingsbury's Planting Green Roofs and Living Wallsand the Earth Pledge Foundation's Green Roofs: Ecological Design and Construction, Werthmann's book is recommended for academic and professional collections.