At the beginning of the movie "Borat," in a Kazahkstan village, an automobile is towed by a horse, one horsepower.

So, if all the vehicles in the world were towed by horses and we had 150-horsepower and 250-horsepower, would the damage to the atmosphere be worse from the generated methane from all those horses than from gas and diesel? <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />