People say cow farts are contributing to global warming. Here's the numbers: Average cow weighs 2,000 lbs. Average human -- 140. The farts/pound, measured by methane volume, is equivalent between our two species. Humans foul the air 50 times as much as cows. Src: Google 

 Actually it's cow burps.  

 Politicians foul the air 5 million times as much as humans.