Look here:
1) Cars kill people, thousands of them every year.
2) Cars belch filth into the air, the air that I breathe (and you breathe it too).
3) Cars use up unrenewable resources (which means we're saying to future generations, for example, "You need oil for some reason or other? Tough ****, we used it all up!!!")
4) Cars contribute to global warming.
5) Cars use up much space (parking garages) and are a nuisance even after they're disposed of.
6) Did I mention that cars kill people, thousands of them each year?
The term, "Dogies" is actually far too polite.