Listening to NPR right now about the future of this country as it relates to Oil. The common idea is to reduce demand by driving smaller cars, hybrid cars, and eventually non-petrol based vehicles.
To that I respond, "Sure, great... that'll help" but it misses the bigger picture. Step back and ask the question,
"How can we reduce the need for travel/movement in the first place?"
Answer that question and you're getting somewhere. There are really good answers to that question that not only solve that problem but dozens more.