Although it\'s been exhaustively explained before by those who won\'t make a buck off of the fuel cell/Hydrogen myth:
1. Hydrogen generated from electricity uses 3 to 4 times as much electricity to run a car as a simple battery electric (BEV) or plug-in hybrid vehicle (PHEV). That means that while $10K worth of solar cells on your roof might provide enough electricity to handle your driving needs, it would take $30K worth of solar cells to drive using hydrogen (whether using fuel cells or normal Internal Combustion Engine (ICE)).
2) Hydrogen generated from natural gas uses a bit more natural gas to drive a mile than you would need if you just used a natural gas hybrid. So why bother since I can refuel a natural gas car from the natural gas already at my home.
3) Fuel cells are inherently complex and fragile. It is very unlikely they will ever be cost competitive with plain old ICE.

If Honda really cared about producing clean and/or efficient cars, they would continue producing their EV+ (pure BEV) or offer a CNG fuel version of the Civic Hybrid TODAY. They would also quit throwing us their tired line about how they are spending so much effort developing the FCX which will always be \'just around the corner\' and \'almost cheap enough\'.
Clearly the FCX is just an excuse to continue selling gasoline powered cars for as long as Honda can.