‘true alternative energy production’

There are many technologies which claim to be alternative, eco-friendly, alternative or bio. True alternative energy means an energy which we can put to useful purpose, which originates from an indefinitely renewable resource and which does not emit greater pollutants than its non renewable alternative. Wind, hydro, biogas, would all qualify as true alternative energy resource. Ethanol and bio-diesel may not if, on examination, they are not energy positive.

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