The problem is people in general aren't responsible.
Which is why we need to give them an incentive to use public transportation, use a power company that uses clean energy and doesn't keep the thermostat cranked up.
Really, all of them means nothing when we talk about transportation though. We could stop a LOT of pollution if we could make cars more fuel efficient and environmentally friendly.
I recall a study a while back that said that cars contribute more to greenhouse gases than the tar sands.
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