It makes more oxygen than carbon monoxide! (Well not really, but still. :p)

I actually did some quick research to prove you wrong. The average car, driving the average mileage, produces 575 pounds of carbon monoxide per year (the number for carbon

*dioxide*, however, is much higher). Of course, this is a Smart Car, which has a relatively low fuel consumption rate, meaning that the amount of carbon monoxide this car produces in a year is likely much lower than 575 pounds, let's say (roughly) 300. If it's a hybrid vehicle, expect it to be even lower.

Then I tried to find out how much oxygen grass produces. A quick Google search shows that 650 square feet of grass can sustain an adult human. By quickly eyeballing this car, it has (at most) 50 square feet. 650/50=13. In a year, the average adult breathes roughly 7,000 cubic feet of pure oxygen, which has a mass of roughly 625 pounds. For the sake of convenience, let's round that to a nice 650, which coincides with the number of square feet, meaning that one square foot of grass produces roughly a pound of oxygen per year.

That means that this car produces roughly 300 pounds of carbon monoxide and only around 40-50 pounds of oxygen per year. Even when it's covered in grass, my research shows that it still produces much more carbon monoxide, and even

*more* carbon dioxide.

Then, after all of my research was done, I realized that it's just artificial turf

.