Green/renewable/sustainable aren't complete synonyms. As a shorthand people consider huge natural sources like the Sun that is already outputting whether we ta

Green/renewable/sustainable aren't complete synonyms. As a shorthand people consider huge natural sources like the Sun that is already outputting whether we tap into it or not (same with geothermal) differently than more limited ones like oil or uranium deposits. We'll probably change the language if we ever get into megastructure or solar-system scale engineering that blurs that distinction.