whiCh oF thE Following is prACtiCAl But only mAkEs A mArginAl ContriBution to solving thE proBlEm oF grEEnhousE Emissions
A．thE usE oF FuEls othEr thAn gAsolinE.
B．improvED EnErgy EFFiCiEnCy.
C．thE introDuCtion oF lEss polluting Driving systEms.
D．rEDuCing CAr usE By CArpooling.