Arnold Schwarzenegger won't be able to keep quipping that he'll be back if he continues to destroy the environment in his trademark Hummers. They have few redeeming features other than their bold size and masculine looks, nevertheless they're classics in their own right.

While Hummer offer no official mpg figures, independent tests rank it anywhere from 15 to a feeble 9mpg, making this the quintessential world terminator. However, Arnold has done the decent thing by making his latest model (above) hydrogen powered.