Unit-7-We-have-only-one-earth!

Wehaveonlyoneearth!•1.Revision:differenttypesofpollutionlightpollutionMarinepollutionwhitepollution•WaterpollutionNoisepollutionAirpollution2.Whatshouldwedoandnotdo?•Dosanddont'sforenvironmentalprotection.=Whatweshoulddoandshouldn'tdotoprotecttheenvironment.•dosanddon'tsn.注意事项；该做的和不该做的事情Don'tsDon'tsDon'tsDos•RidebikePlantmoretrees•reusewastewater/usegreywatertoflushtoilet•takeaclothbagwhengoingshopping•useenergy-savinglightbulbs•busebothsidesofthepaperwhenprintingfiles•maketoyswitholdclothes