SincethefirstEarthDayin1970,Americanshavegottenalot“gre...
问题详情：SincethefirstEarthDayin1970,Americanshavegottenalot“greener”towardtheenvironment(环境).“Wedidn’tknowatthattimethatthereevenwasanenvironment,letalonethattherewasaproblemwithit,”saysBruceAn...