Holler if I'm wrong, but I'm under the impression that most motorcyclists aren't avid environmentalists.

While there may be a handful of tree-huggers who choose to lessen their impact on natural resources by gravitating to two wheels, but ask most bikers why they ride and you're likely to hear words like "freedom," "adrenaline," or "convenience" in their answers. And while the so-called power scooter craze has won over a few motorcyclists, a considerable social divide remains between scooter and motorcycle folks.

Further separating those demographics is the escalating trend of hybrid scooter concepts (as if a 250cc 4-stroke internal combustion engine was a gas guzzler.) Companies like ENV and Vectrix are developing alternative energy motorbikes, but it's hard to tell if these are earnest attempts to save the environment or ploys to cash in on a lucrative two-wheeled version of the best selling Prius.

Are these the rumblings of a minor revolution in motorcycleland, or are they simply the fringes of a movement that will never quite build steam? Time will tell if serious bikers choose to ride green.