What most people tend to forget is the scale of factory farming. About 30,000,000 cows 130,000,000 pigs and 8,000,000,000 chickens are killed yearly in the US

What most people tend to forget is the scale of factory farming. About 30,000,000 cows 130,000,000 pigs and 8,000,000,000 chickens are killed yearly in the US alone. You can imagine that they cannot be just grassfed besides the fact that pigs and chickens do not eat grass so they are fed soy that could fed to humans, animals are not magic machines that turn air into food, the only thing capable of converting nitrogen water and sunlight into protein are plants, any step in the middle generate loses, animals need energy for their vital processes so the rate of conversion of fed-to-edible calories is aprox. Poultry:11% pigs:10% Beef:1% (I could cite the sources if anyone wish to investigate more) All this is just the efficiency aspect of it, let’s pretend they don’t need water or create any waste.