You really think your restaurant and supermarket beef is coming from grazing? Those cattle live in dense feedlots, where they are fed corn and soy.
Isn't corn production massively subsidized in the US? So it becomes cheaper to feed cattle with corn instead of grazing. Madness.
That type of meat production is not something I support.
http://www.worldstopexports.com/top-beef-exporting-countries...
Interestingly, the #1 exporter, Australia, has historically used a mix of grazing and feed grains. But they're expecting to grow more feed grains because grazing suffers during droughts, which are increasingly common. Apparently those grains are wheat and barley; corn is definitely an American obsession. I assume that will be grown on land that could otherwise be used to grow food for humans.
https://www.beefcentral.com/lotfeeding/grain-sector-faces-ne...