I don't think the answer is reduce though... I think it's increase... humans wiped out so many of the ruminant animals (buffalo mainly) that kept the grasslands healthy... we've largely over-farmed in the interim since. We need more ruminants, not less.

This means raising much more than we currently do, and probably a reduction in slaughter numbers for the next 50+ years to increase the domestic supply. Can't speak for other nations... but it's literally expanding grasslands as opposed to desert.