Brian,
What about all that methane? Definitly a greenhouse gas. But ya gotta love that 4 hoof drive, even Jeep is having trouble besting it. And when is the last time you were on the trail and found some poor soul stranded because his donkey got "high sided" trying to go up and over a sharp hill and so needed to be strapped out? Now I think many of those horses have a better and higher "lift kit" for even better break over angles than the donkeys but hey I'm just an old fashioned internal combustion engine kind of guy.
Have a great night....
