Crossword clues for Footprint, for one. 4 lettersAnswerClueCLUEFootprint, for one.GOINGGREENReducing one's carbon footprint ... or a hint to this puzzle's themeGOGREENReduce one's carbon footprintENERGYUSEQuantity that's tied to one's carbon footprintGOESGREENReduces one's carbon footprint, saySLOWFOODCulinary movement that aims to reduce one's dietary carbon footprintTREADSHRINKEROne who reduces your car's footprint?