[单选]  Top3GreenHomeInnovations      .Therearemanythingsyoucandotoreducecarbonemissionandhelptomaketheearthabetterplaceforfuturegenerations.Hereareafewsuggestions.      AlthoughLEDlampscostmoremoneythanstandardincandescentorcompactfluorescentbulbsdoatthebeginning,theselong-lastingLEDlampswilleventuallybeworththemoneybecauseofnergy saved.LEDlampsalsoproduceacleaner,morenaturallight.      .“Water”isahottopic,especiallyintheSouthwest.Household waterfiltersarenowavailabletocleanandreusewaterfromshowersandbaths.Graywaterreusesystemsredirecttheusedwaterfromwashingmachinestolawnsorgardens.            .Buildingmaterialsandembellishmentslikepaintandcarpetscan emit chemicalcompoundsintotheatmosphere,andbecauseahomeisanenclosedspace,thosecompoundscansometimesaccumulatetodangerouslevels.Installingawhole-houseairpurificationsystemisonewaytokeepindooraircleanandcirculating.   Going“green”doesn'thavetobeachallenge.Ahomeisalong-terminvestment.Youdon'thavetostartoverfromcratch. Makesmallchanges.ChooseenvironmentallyfriendlypaintorLEDbulbs.    Chancesarethatyourhomewillneedimprovementseventually.Wheneverpossible,chooseupgradesthatwillreduceyourcarbonfootprint.It'sgoodfortheplanet,andit'sgoodforyou.A.Inrecentyearsindoorairpollutionhasgotalotofattention.B.AirPurificationC.WaterRecyclingD.Inthelastdecadeagrowingnumberofpeoplewereinterestedinconservingenergyandpreservingtheenvironmentbyliving“green”E.LEDLighting