It's amazing how much greenhouse gas is produced by raising cows, it's almost as amazing how much greenhouse gas @Stasys-Girskis produces when he eats a hamburger.
The chart in the article only looks at the gases as well, but the amount of land that is used for grazing cattle or producing feed for them is also massive if you compare it to the amount you need for growing any kind of cereal or vegetable crops to eat.