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Article snippet: Efficiency is not a newfangled concept, as you probably know if you’ve ever purchased an Energy Star-certified dishwasher or asked about the gas mileage of a car. Across the United States, per-person energy use has fallen since the 1970s even as overall demand has risen, according to the Energy Information Administration. The savings have been more dramatic in California, where state officials say aggressive efficiency standards for appliances and buildings have saved consumers well over $100 billion....