Beef has one of the worst feed conversion ratios around. To get one unit of food energy from beef, that cow has to eat around 15 units of plant energy. Chicken is much better at around 3-to-1. So if you had farmland and were growing a crop, lets say that crop could directly feed 100 mouths. If you were to take that crop and use it to feed chickens, your land could now feed 33 people. If you were raising cows, with that same farmland you could now feed 7 people. If food becomes scarce, you would be starving 93 of the original 100 people by raising cows. You're throwing away over 90% of the food energy. So yes, it's extremely polluting.
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