Pie in the Sky folks....sheer folly.
If the farmers start selling their corn to the "Petrol" market....what happens to the cost of animal feed, the price of flour, and other "corn" based products?
If one starts breaking down water into Hydrogen fuel....what about the demand for water by all other users....perhaps bathing becomes too expensive.
Electric vehicles? Where does the fuel supply for that come from? How do we generate the necessary amounts of energy to "fuel" that concept?
I am not a nay sayer on this, but we have to consider the collateral issues while seeking the perfect source of "fuel".