A 1960s bank building in San Jose, Calif., is being renovated from "one of the ugliest buildings in town" to a work of "z-squared" technology, a cutting-edge concept in eco-friendliness. Z-squared means zero-carbon-dioxide emissions and zero energy use from the grid, and the building will become one of the first commercial structures in the country to adopt the concept by supplying all of its own energy while emitting no greenhouse gases.

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