Fuel Cell powered vehicles emit water vapor--which is a _severe_ "greenhouse gas".
You may be saving a few things, but the environment isn't one of them.
Have you guys seen the ads for the Honda fuel cell car where they replace guns--which they claim are "harmful"--in a warehouse shoot-em-up sequence with water guns, and then say that they'll replace harmful gasoline with "clean" water vapor.
I for one could never renounce my pride to drive that thing, even if it didn't suck. I think the Simpsons' quote "I'm an electric car--I can't go very fast, or very far, and if you drive me, people will think you're gay." applies here.
It's fugly, it's underpowered, it requires rare fuel which is NOT as safe as they claim, it pollutes but lies about it, and it's outsourced. If that is the future of the hydrogen car, which it probably will be seeing the success of asian hybrid cars, then I don't want a part in it.
If the government really doesn't want us to know (cough cough), then it's because they're trying to prevent stupid people from being fooled by the lies of the ads.