Well I don't plan on trading in my pickup for a horse anytime soon, but the answer to the original question appears to be better. According to this article the average car produces 8,320 pounds of CO2 a year. This one says methane is more than 20x more effective than CO2 as a greenhouse gas. 18 x 2.2 x 20 = 792 so your average car causes 10x more greenhouse effect than your average horse.
Save a life. Adopt a greyhound.
![[Image: JUkLw58.gif]](https://i.imgur.com/JUkLw58.gif)