10 cool electric cars of the future
Why it's green: Runs on battery power.
Why it's cool: Dynamite styling.
The Audi e-tron concept car is a sexy, two-seat sports car that runs exclusively on battery power. Two electric motors mounted on the rear axle propel it from zero to 62 mph -- 100 km per hour -- in 5.9 seconds. That's not bad, considering some of the fastest, gas-guzzling cars in the world take about four seconds. To save weight, the e-tron is built on a rigid aluminum frame, with the body panels made of fiber-reinforced plastics.