The Jan. 30 letter "Water for Clean Fuel" is another example of advice by earnest but naive people from the "all you gotta do" crowd. The assertion that "our inventors and researchers can develop portable systems to split water into its gasses while aboard motor vehicles" is pure wishful thinking. It is a wonderful idea, but one that bumps into the hard realities of physics. Hydrogen is a viable fuel for motor vehicles, but it requires electric power to produce it through electrolysis. In a vehicle, fuel would have to be carried to generate the electric power somehow and then...