Showroom stickers would rank cars based on fuel economy and emissions.

Plug-in supercar could be yours for a mere $600,000.

But GM says $350-a-month lease deal will put electric car within reach for many.

Former Formula One engineer unveils superlight eco car.

World's fastest hybrid picks up fares in Rome.

Zero emissions? That depends on where you get the electricity to charge your car.

Experts say Asian smog accounts for 29% increase in baseline ozone since 1984.

Bicycles give way to automobiles, but e-bikes keep two-wheel tradition alive.