>The gas infrastructure has already been built. And it works very well: for gasoline. Hydrogen cannot be contained in a rubber hose. Ammonia will eat away copp

>The gas infrastructure has already been built. And it works very well: for gasoline. Hydrogen cannot be contained in a rubber hose. Ammonia will eat away copper pipes (see http://encyclopedia.airliquide.com/Encyclopedia.asp?GasID=2#MaterialCompatibility http://encyclopedia.airliquide.com/Encyclopedia.asp?GasID=2#... ). CNG works fine, under pressure, which requires retrofitting everything, but natural gas is a fossil fuel. Biofuels come with a whole host of other problems. The simple fact is, whatever we use, we're going to have to rebuild stuff. There's no way to reuse the gas infrastructure for any fuel that isn't a non-oxidizing hydrophobic liquid, which rules out approximately everything. Hydrogen fueling stations aren't retrofitted gas stations: they're a totally new thing: http://en.wikipedia.org/wiki/Hydrogen_fuel_station#Hydrogen_filling_stations http://en.wikipedia.org/wiki/Hydrogen_fuel_station#Hydrogen_... >However, this does not begin to replace the existing extensive gasoline fuel station infrastructure, which would cost a half trillion U.S. dollars in the United States alone. This is not cheap.