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Fuel cell cars will be a good idea when we find a way to make hydrogen
more efficiently. Currently we get nearly all of our hydrogen from
natural gas at a 40% energy loss. Energy wise it makes more sense to
burn the natural gas in a combustion engine than turn it into hydrogen
for a fuel cell car.
An interesting spreadsheet that you can download from Argone National
lab allows you to calculate well to wheels energy for several
alternative car engines (ethanol, fuel cells, etc.):
http://greet.es.anl.gov/