As the world grows, in both wealth and population, so will the demand for energy: global primary-energy consumption is on course to increase by 25 percent between now and 2030. At the same time, concerns over pollution and climate change are forcing businesses and governments to think hard about how they produce and use energy. Energy efficiency, which is sometimes called the “fifth fuel” (after coal, gas, nuclear, and renewables), can play an important role in helping the world meet its demand for power and mobility.
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