Images: Fuel-cell karts power a 'racing circus'

Dutch company Formula Zero is trying to have fun while saving the planet--it's preparing to launch a zero-emission kart-racing circuit. One of the goals of the project is to develop new and more powerful fuel cells, technology that's being touted as one route to reducing automotive air pollution.

The company has developed a "racing circus" modeled after the barnstorming flying circuses of the early days of aviation nearly a century ago. Formula Zero hopes to spread its vision for developing automobile technology that is safe for the environment.