That’s all well and good – except that a 50% improvement in fuel efficiency doesn’t cost “hundreds more” to build. It cost “thousands” more to build. And whenever there is a divergence between the highest bidder and the lowest seller, demand will go unsatisfied: No matter how many people are willing to pay $20,000 for a 40mph car, none will be built until someone thinks of a way to build them for less than that amount.

Everyone is willing to do “their part” to help the environment, as long as other people are willing to bear the true burden. People are always willing to force others to pay for things they desire for themselves.