Well, it's up to you to put pressure on the government/corporations/..., though. Buy cars that are fuel-efficient, as opposed ones that aren't - or if you can't find a suitable car, write to the industry and tell them that they've lost a sale because they're not selling the kind of car you want.

I'm sure you could come up with lots of other things to do. Yes, there *are* things the government can do, but ultimately, the power lies with the purchasers, doesn't it?