emissions can be nearly eliminated if the hydrogen is produced from renewable sources of electricity and the electrolysis process of splitting water molecules. Using cellulosic ethanol to produce hydrogen reduces emissions to 100 to 150 grams per mile or similar levels as burning ethanol. However, if instead of renewable electricity, hydrogen is made through electrolysis using the current mix of generating sources for the U.S. power grid, GHGs are significantly increased to about 500 grams per mile (fuel cell vehicle), 750 grams per mile (hydrogen combustion hybrid), or even 980 grams per mile (hydrogen combustion without hybrid)