San Francisco goes green

The city uses digital and green technology to increase urban efficiency.

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Smarter building - Living roof
A new museum, the Renzo Piano-designed California Academy of Sciences, is one of the most sustainable structures in the world.

Its 2.5-acre "living roof" features local plants and a glass canopy of photovoltaic cells that produces energy for the building.
By David Ewing Duncan, contributor

NEXT: Smarter transit - High-tech bus stops
Last updated September 10 2009: 4:53 PM ET
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