LED streetlights in Ann Arbor, Mich. The chair of a 2010 report on efficiency potential said buildings could use nearly 60 percent less electricity by 2030 by installing existing technologies, like compact fluorescents or LEDs, insulation, double- or triple-paned windows, and on-demand or solar hot water heaters.
SAN FRANCISCO — Energy efficiency is a way to meet the world’s growing energy needs, just like building more power plants — except that it costs less, emits no carbon dioxide or radiation, and does not rely on scarce resources in potentially hostile places.
Efficiency is often confused, detrimentally, with conservation. Conservation connotes making do with less — turning down the heat or driving a smaller car. Efficiency means getting more bang per buck. For example, California’s 35 years of efficiency standards for appliances have created refrigerators that use 75 percent less electricity than models from the 1970s. Yet today’s refrigerators are larger, have more features and cost less in inflation-adjusted dollars.
In transportation, “we could double fuel economy for light-duty vehicles by 2035 without changing the size or acceleration of vehicles,” said Lester B. Lave, an economics and engineering professor at Carnegie Mellon University in Pittsburgh and the chairman of a 2010 report on efficiency potential from the National Academy of Sciences.
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