For some years the fuel cell has been limited to military and space use. We have reached a point where they can be used to replace the internal combustion motors in automobiles. The cells run on hydrogen, and emit only water and heat - no pollution. The big auto makers have invested millions in this research, and are trying out test vehicles. So where is the problem? Big oil and the conversion units to extract hydrogen from another fuel (natural gas, methane. etc.) I think we need to get the oil companies to do the conversion of gas stations, and make money doing it; or there is no way we will achieve this very desirable goal.