I know where you're coming from with cars. I've given up air travel for reasons that may be similar - the planet can't afford the environmental impact. (And I'm rather fond of human beings and would like to have a planet that can continue to support our species in a few generation's time)
I don't fly either, but the environmental impact of car travel is just one reason; even if it wasn't there I think cars would be a blight. They'd still produce the same levels of carnage (leading cause of death from 15-35, etc) and be as much of an instrument of exclusion for people who can't or won't use them. Obviously the environmental and oil-dependency issues don't help _either_, but on the other hand I think we're doomed on those issues regardless - whereas there is some hope that car-free communities like Vauban will become more popular and that I'll be lucky enough to live in one at some point.
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