Hydrogen is not a fuel. It is an energy storage medium. It costs energy-- which is money-- to separate hydrogen from water or other compounds. Only part of that energy is regained when hydrogen is burned in a heat engine or used in a fuel cell. Because of entropy, you will NEVER get it all back.
The hydrogen economy is a foolish dream, fueled by government power instead of common sense, using money that the government siphons off the economy in a massive-scale Ponzi scheme.
It is sad that such is being promoted here on Free Republic.
Hydrogen powered cars are not being pushed much in the USA but they are huge in Japan and getting bigger in Germany. Neither country can afford to import oil anymore—especially the Japanese. Their debts are too high. So a lot of deep pockets are pushing the development of these cars. This stuff in 5-10 years will start to take small bites out of the demand for oil and then take bigger bites.
The electric car is the USA entry to alternatively fueled vehicles in the USA. Fuel cell cars so far have not got much traction.