Which Alternative Fuel is Cleanest?
Which alternative fuel is cleanest in terms of carbon emissions, including the energy spent on manufacturing the fuel and the engines that use this type of fuel?
Also, which one is most practical? I don’t know it air cars will be able to carry out our economy.
Electric/EV’s?
Ethanol?
Natural Gas (LNG or CNG)?
Biodiesel?
Methanol?
Compressed Air?