Is hydrogen fuel abundant enough for millions of cars?
Unfortunately hydrogen does not exist on earth in its elemental state. It is found combined with sometihing else such as oxygen to form water and carbon to form methane. To get hydrogen from methane you release co2 back to the atmosphere and defeat your purpose to reduce the amount of greenhouse gases released to the atmosphere. You might as well just burn the methane and save the step of extracting the hydrogen. To get hydrogen released from water in its elemental form so that you can use it as a fuel, requires approximately 50 kilowatt hours of electricity per kilogram of elemental hydrogen produced. That is with the equipment currently availablle which works at 70% efficiency. If you could get electrolysis equipment to work at 100% efficiency you would still use approximately 35 kilowatt hours of electricity per kilogram of elemental hydrogen. That is still a great deal of electricity for a kilogram of elemental hydrogen. Note: One kilogram just a little over two pounds. That is app
