Mean Machines tracks down the toughest and meanest machines moving today, examines the construction, strength and speed of these incredible machines - then pits one against another in a battle of the best. / Using combinations of history, engineering, speed, size, style and then live tests, each half-hour of the 10-part series builds to an intriguing and competitive exploration of whether green versions of vehicles can be as sexy, powerful and exciting as their originals. In challenges designed to test and compare endurance, speed, power and agility, can environmentally-friendly vehicles measure up against fuel-injected versions of the same category? In a world obsessed with its carbon footprint, the results of the green machines challenges could determine what we all want to drive in the future. (Source: Discovery)