A diverse range of green automobile manufacturers have been heavily emphasizing the eco-friendly attributes of their cars. A lot of concept, and even some production, cars share a peculiar commonality in their offbeat choice of being built on three wheels. The slideshow includes several examples, most of which are electric cars.

The following eco-friendly vehicles all exhibit characteristic which may seem bizarre to the eyes of drivers in 2008, but perhaps this will be a mainstream attribute of green cars of the future.