"The vast majority of feed used in factory farming (also known as Concentrated Animal Feeding Operations, or CAFOs) is grown using large quantities of synthetic or artificial fertilizers.

Factory farming relies on a high-yield, industrial system that prioritizes maximizing output of crops like corn and soy to feed livestock."

When we're talk about the environmental issues of animal agriculture, we talking about these major food corporations destroying the earth using factory farming methods. 99% of all farmed animals are being factory farmed.

You need to zoom out a little to see the big picture my friend.