It looks much like any other filling station: Shell-branded gasoline pumps along the shoulder of a busy highway. But this is no ordinary Shell station. It is the hub of one of Iceland's most ambitious projects: The world's first commercial hydrogen fueling station.

Power plants like this in the photo, right, produce much of the volcanic island's green energy. Earth's heat turns water to steam, which spins turbines.

(Read more in the Christian Science Monitor)