[adambom]

It kind of bothers me when people talk about fuel cell vehicles as being "emissions free". Producing the Hydrogen required to run a fuel cell requires either electrolysis of water, or extracting it from natural gas. That's really energy intensive. Either the emissions come out your tailpipe or go out a smokestack. Pick your poison.

There are other interesting fuel cell technologies that use liquids, like methanol, instead of Hydrogen as a fuel source, but even Methanol requires energy to be produced.