The other issue is displacing food crops in favor of fuel crops. It takes a whole lotta acreage to make x gallons of motor fuel.

I'll need to run, duck & cover after this one, but, we are going nuclear / battery in the not too distant future. It's already in the works.

http://www.nei.org/index.asp?catnum=4&catid=403

http://www.google.com/search?hl=en&q=2010+Initiative+nuclear&btnG=Search

I hate to go Mr, Pessimist again, but being in the business of transporting gasoline, motor fuels & hazardous materials, I can assure you that unless the feds supply well over 95% the drivers, vehicles, and liability coverage, Hydrogen will never become a widespread means of motor fuel for the masses. Who will move all that Hydrogen? It can't be piped. Go try to get set up to transport LP or propane. There are a total of two insurance carriers in North America who will write propane. Neither will write a new carrier with no track record to haul commodities requiring the legally mandated minimum of 5 million in insurance. Another issue is that the trailers we use to move Hydrogen are vessels designed to roll down the road at either 2,700 PSI, or 7,000 PSI, without cracking or bursting. A gasoline tanker costs around $60,000, and is good for around only 10 or 12 psi. I'll let you figure out what the Hydrogen tankers cost.

I'm not suggesting Hydrogen fuel isn't a highly promising technology, it just all falls down when the transport piece is introduced.

[I didn't even bring up the NIMBY issue of where to build all the Hydrogen plants required for short haul distribution.]

And now a word from atop the soapbox: I am all about freedom of choice, and if someone wants a big car with 10 MPG, they still should be able to have one. On the other hand, we as a nation need to wake up one of these days and get over our hoggish ways. We had the chance to learn during the oil embargo of the late 70s, and soon after forgot all we had learned. I don't pretend to have the answers on how to get the nation to conserve, and I am guilty of wasting fuels, but we will have to figure it out one of these days. I suppose the prices of fuel will make it happen for us.
We get p*ssed at big oil for their prices, but it's really quite simple - wanna know why they charge so much?
Because they can, and we keep buying it. If I were Mr Exxon, I'd probably be be charging even more.