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Reuters/Robert Galbraith
A worker climbs among skylights on the "living roof" — a 2.5 acre expanse of native California plants — at the California Academy of Sciences building in San Francisco, California, on September 18, 2008. The new design unifies the Academy's original set of 12 buildings, features a natural-history museum, aquarium, planetarium, and research facility, and is one of ten pilot "green building" projects of the San Francisco Department of the Environment.
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