The ones that don't require the oil that is now killing the gulf coast.
oooooooo, I'm so green.
Honestly though I don't really like any cars, what they represent, or what they have helped to spread in the culture of humanity. Maybe its because my dad sold them growing up, but I have never really liked them.
EDIT: Just felt I should represent the insanely small minority of people who chose not to use them. Nothing against people who like them.