Inhabitat has a breakdown of what they see being the most significant trends in transportation in 2008.

3) IT’S NOT JUST ABOUT FUEL EFFICIENCY
Everyone is looking at emissions as the greatest contributor to global warming, but there is so much more that we can do to improve our methods of transportation. This past year Mazda showcased the Kiyora, a car that cleans water, while BMW showed a car that not only ran on hydrogen but also cleaned the air as it moved through the city. But none was as exciting to us as the super-environmentally friendly Eco-Elise, which was revealed by Lotus in July of this year. The vehicle was not just an energy-efficient vehicle, but was created with the greenest materials that the company could find. It’s like they read our minds!