While I don't plan to get in another circuitous environmental argument with you circ, I have to say that using a collision between an Excursion and a Prius for your example isn't exactly a credible justification. That we currently have monstrous Excursions rolling around just because some genius in Detroit a decade or three ago decided that's what America needed to be driving isn't really a justifiable cause for keeping them around any longer. It's proven that it was a wasteful path to have started down, so wouldn't it be best for all involved to just cut our losses and try again before it's too late? That Excursion that seats 12 isn't going to do anyone any good if there isn't anywhere worth driving any more.

I mean, while I've personally never actually hugged a tree, I'm just saying that it would seem to be in all our best interests to do what we can to help ensure we do at least have some in the future should a person happen to get the urge. Another bonus would still be that whole air-making thing.

Didn't the I'll-drive-what-I-want-let-the-next-generation-worry-about-it attitude die out back in the 80's?

And some valid points being made here, but again, it's voluntary. No one is saying you'll have to do it.