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Alternative energy is a term for any nontraditional energy form, source, or technology differing from the current popular forms, sources, or technologies. Today, it is generally used in the context of an alternative to energy deriving from popular fossil fuels and thus includes energy derived from such environmentally preferred sources as solar, water power, biomass, wind, geothermal, ocean thermal, wave action, and tidal action
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http://www.newworldencyclopedia.org/entry/Alternative_energy
