There seems to be a hidden fallacy here. If cows were free range eating _only_ from non productive grass, then sure, they helped turn them into useful proteins

There seems to be a hidden fallacy here. If cows were free range eating _only_ from non productive grass, then sure, they helped turn them into useful proteins in an efficient way. However, we(humans) as we always do, took things too far, and have been turning lots of wild land to make grass as food for these cows that eventually turn them into proteins. That only leads to more and more grass production and burping cows :-(