Interesting article here at 3P.
Note the importance of incentives in affecting behavioral change and the discussion of standards vs. market-based policies. I also like the discussion of the vulnerability to price shocks. Curtailing our use of gasoline is a kind of insurance against economic instability. As much as I like these arguments for raising the price of gas, we also have to recognize reasons for keeping the price of gas low (at least for some users). The U.S. is really big geographically speaking, so within country commerce may depend more critically on cheap transport than in smaller nations. Check out the linked Economist article. It's short and good.