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A fuel cell uses just the hydrogen, and if you use gasoline as your source, you still have waste gasses, so it doesn't help the environment that way. Building up a viable source for H2 isn't going to happen on a mass scale any time soon...that molecule is just too small to contain easily, and compressing it to a useful density still costs a fair amount of energy just on its own, not counting extracting it in the first place, regardless of where you get it from. With current tech, you either have to make it on site, or truck it to where it is needed, pipelines are not viable. There are not too many retail H2 locations out there. Fuel cell powered EVs will have limited regional sales to where fuel is available in the near term (Toyota, maybe next year), and will be as much an experiment as the plug-in EVs on the road now, but unlike an H2 source, pretty much everyone has an electrical outlet available to them.
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