this pAssAgE is mAinly ConCErnED with ______.
A．thE sEriousnEss oF EnvironmEnt DECAy
B．grEEn movEmEnt AnD its inFluEnCE
C．grEEn ArChitECturE
D．pEoplE's rEsponsiBility to protECt EnvironmEnt