most of the USA cattle industry is based on dirt cheap soybean and corn, grass-fed beef is less sustainable and productive, you just cannot expect the same growth of cows body given that low protein intake, + the area needed is extremely huge and simple calculations dictate that one would have to grass-feed the cows using the whole area of North America and north parts of the South (assuming all of it is rich soil) to replace the environmentally destructive soybean-corn-based meat production. It isn&#x27;t sustainable, it&#x27;s hugely inefficient and isn&#x27;t a solution.