Production of beef is at sustainable levels, provided cheap energy.
But increase fertilizer 3-10x and fuel 3-5x and you’re going to adjust in prices. And you’re going to get a new sustainable level.
Btw when I say “sustainable” I mean market conditions, not environment. The environment can likely handle far more cattle, but it requires input (fuel, fertilizer, etc) for us to produce said cattle.
Recall, there used to be millions (probably tens of millions) of bison roaming the Americas. We basically replaced them with cattle. Cattle are constrained to a region and fed food from farms. Environmental wise, I don’t see much issue with cattle (when comparing to other pollutants)