Perhaps Hydrogen does exists infinitely, but cheap sources of hydrogen is not...

Hydrogen fuel does not occur naturally on Earth and thus is not an energy source, but is an energy carrier. It can be made from a number of sources, currently it is most frequently made from methane or other fossil fuels. Hydrogen production via electrolysis of water is generally inefficient and expensive and is rarely used.

Problems with fuel cell technology :

1) Fuel cell cost

Currently, hydrogen fuel cells are costly to produce and are fragile. Engineers are studying how to produce inexpensive fuel cells that are robust enough to survive the bumps and vibrations that all automobiles experience.


2)Freezing conditions

Temperatures below freezing (32 °F or 0 °C) are a concern with fuel cells operations. Operational fuel cells have an internal vaporous water environment that could solidify if the fuel cell and contents are not kept above 0° Celsius (32°F). Most fuel cell designs are not as yet robust enough to survive in below-freezing environments. Frozen solid, especially before start up, they would not be able to begin working. Once running though, heat is a byproduct of the fuel cell process, which would keep the fuel cell at an adequate operational temperature to function correctly. This makes startup of the fuel cell a concern in cold weather operation. Places such as Canada or Alaska where temperatures can reach −40 °C (−40 °F) at startup would not be able to use early model fuel cells.


3) Service life

Although service life is coupled to cost, fuel cells have to be compared to existing machines with a service life in excess of 5000 hours for stationary and light-duty. Marine PEM fuel cells reached the target in 2004. Current service life is 7,300 hours under cycling conditions. Research is going on especially for heavy duty like in the bus trials which are targeted up to a service life of 30,000 hours.

Hey bro...nice entry but perhaps you should put a name to this latest science project from Honda for the benefit of other readers? It's the Honda FCX if I'm not mistaken...

Here's a review of it done by Top Gear