Half of the US is an arid climate which can and has historically sustained hundreds of millions of Buffalo and other cattle. The reason farmers use corn and req

Half of the US is an arid climate which can and has historically sustained hundreds of millions of Buffalo and other cattle. The reason farmers use corn and require irrigation to concentrate herds in one place is not because there is no water but because the beef tastes better and can be raised more cheaply than with less water intensive mechanisms.