[COLVERT]

Originally Posted by john116

Recent studies seem to generally agree that a plane isn’t necessarily the most polluting means of transportation. That’s why it’s also being said a car pollutes just as much, and often even more than a plane over equivalent distances. For example, a study by the University of Michigan Transportation Research Institute states the energy intensity of car transportation is on average 57% higher than air transports. In other words, a car emits more CO2 than the average planes because they consume more energy to transport the same number of passengers.

That's cos all their cars have 6 litre plus engines. Darn Yanks.