The reason that this vehicle is here on the green side of things is the diesel engine which powers it. Similar to the Audi R10 racecar, the hope is to take advantage of the fuel mileage benefits of the diesel engine over its petroleum-fueled competition. Audi did this to good effect last year, dominating the racetrack when it was on the grid. Peugeot hopes to do the same this year.
Two diesel powered racecars on the track this year, hydrogen powered racers, ethanol and hybrid powered rally cars. Maybe it's not so hard to be green after all?