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Alternative energy refers to energy sources which are not based on the burning of fossil fuels or nuclear fission. The overall focus of this category is not meant to be a list of "clean" energy sources, but rather a list of alternatives. Many are used widely today (hydroelectric for example).ko:분류:대체 에너지 pl:Kategoria:Alternatywne źródła energii ru:Альтернативная энергетика