15Billion$$ would start it on its way..... even though Diesel is the life blood of our economy(((IE--- almost all cargo within the United States is shipped via Semi-Trucks including the all important groceries))) we only have 5,000 truck stops and less than 1 in 6 gasoline stations have diesel..... we already have hydrogen fueling stations in place in california and new york..... which are fabulous experiments doing very well.... Auto manufacturers are poised to start production on feasable models and some predict that by 2010 they will be mass producing hydrogen powered vehicles which are hybrids...... kind of like the gas-electric hybrids right now in existence.... also fuel cell technology is not new as I havwe stated..... the first fuel cell was built in the late 1800's.....