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power, biomass, wind , geothermal, ocean thermal, wave action, and tidal action. the term alternative energy also is used for energy derived from sources and technologies that do not involve the depletion of natural resources or significant harm to the environment. as such, it is used synonymously with
, and so forth), while "green power" references that subset of renewable energy that involves the least environmental harm. as delineated in the first paragraph, before natural gas gained popularity, this energy source could be classified under the category of alternative energy, but not that of renewable...
https://www.newworldencyclopedia.org/entry/Alternative_energy