SAN FRANCISCO, CA - OCT 26: Kendra Hauser, Landscape Exhibits Assistant works on the living roof on top of the California Academy of Sciences building in Golden Gate Park on October 26, 2010 in San Francisco, California. San Francisco was recently rated the second greenest US city overall, narrowly beaten by Portland Oregon. The Living Roof´s 1.7 million native plants were specially chosen to flourish in Golden Gate Park´s climate...After experimenting with thirty native species, the finalists were all able to self-propagate. They will thrive with little water, resist the salt spray from ocean air, and tolerate wind. The roof will provide habitat for a wide variety of wildlife. A future project will seek to introduce the endangered San Bruno elfin butterfly and the Bay checkerspot butterfly to this new habitat. Photography by David Paul Morris
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