Honda Clarity Fuel Cell: Race Organizer review

Since a fuel cell generates electricity by oxidizing molecular hydrogen (H2), a fuel-cell car is an electric vehicle with just sufficient battery capacity to work the regenerative-braking system and provide a power reserve. The only “exhaust” from the Clarity Fuel Cell is plain old water, which means it emits neither smog nor carbon as it drives; this is a big plus in the smog-choked cities of coastal California. Since there are no hydrogen wells on the planet, though, the stuff has to be separated from other compounds (usually natural gas, occasionally water) at significant energy cost. You can make “green” H2 via electrolysis of water, as long as you get your electricity from a non-fossil-fuel, non-polluting source; this means that your fuel-cell car is only as green as the energy that went into making its fuel.