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  Definition of alternative energy
  1. energy derived from sources that do not use up natural resources or harm the environment
Hyponyms: solar energy, solar power, wind generation, wind power

 

 
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footprint means the area taken up by some object; "the computer had a desktop footprint of 10 by 16 inches"; a mark of a foot or shoe on a surface; "the police made casts ... more
 
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