talking about how Fuel Cell / Electric Cars / Whatever It Is This Month misses the point:

But if we just worry about gasoline, we see only the elephant's trunk. Even if technical progress meant we could fuel our cars with water from a garden hose, we would continue to bear a host of costs. The nation's obesity epidemic arises in good part from choosing to drive instead of to walk, and from the fast food we tank up on while we're on the road. Forty thousand people die each year in the man-made disaster of crashes, and millions live and suffer because they have been disabled in car accidents. This dreadful toll remains high, despite improvements in car safety, in part because we drive so many more miles.