Something like 30-50M buffalo lived and grazed in North America before they were all killed. The ecosystem can most certainly sustain 30-50M cattle grazing. They wouldn't be as _profitable_ as corn-finished cattle, but they produce meat.
And there are many price and institutional barriers to completely grass fed cattle. The primary being that slaughter is centralized to FSIS inspected facilities where most non-poultry spend their final weeks packed in eating soy and corn.
This will change when we'll have to make compromise because our current agriculture model is not sustainable (both for climate and food production).
As an aside: I stopped drinking coffee because of the environmental impact. I now drink chicory and barley coffee that's locally grown and roasted. The taste is close enough. It also makes it easier to absorb iron and vitamins (which caffeine inhibits, which does not help if you're reducing meat consumption).
We do if we want everyone to eat. Grazing animals are a great way to turn stuff we can't eat into stuff we can eat, and stuff we can use to grow crops that we can also eat.
Vegans are boiling the oceans. Eat what's on your doorstep.
[1] https://www.bbc.com/future/article/20220429-the-climate-bene...
This is not true. There is plenty of food, especially if we put all resources we currently feed livestock into feeding humans.
The vast majority of ruminants are fed corn and soy. If they were all to eat grass we'd be able to produce much less meat than we currently do, and also use much more land
Also, what decisions are you talking about? OP said one does not need meat. Isn't that a provable fact?
Note: she does not like red meat, and we spent years and years trying to get her iron levels up without it. She started to have to get iron infusions, which are no fun at all.
All that stopped when she started eating red meat twice a week.
Yes, this is a very rare case, and I can imagine a future where red meat is provided as something like medicine for those few who really need it.
But some people do effectively need red meat.
Cattle could easily be grass fed. You just wait an extra year before selling calfs at auction. However, selling calfs leads to more $/acre of grazing land, and more cows per acre as well. A week or two eating grain in a slaughterhouse (if sold as a full grown cow) is rounding error.
The big problem I see is that the availability of grazing land is plummeting in the US southwest, thanks to desertification and climate change.
That might be offset by marginal farmland being converted to grazing (due to climate change), but that'll reduce grain production.
We can grow other things, and we can eat less meat.
We do if we want human beings at their optimal physical and mental capacity. It isn't much of a secret that increased consumption of meat led to human beings reaching their optimal physical and mental potential.
Now, excess meat consumption is a problem, but you aren't going to have optimal human beings without some meat.
Japan used to be a vegetarian society for more than a millenia. Their poor diet so terribly stunted the japanese people, physically and intellectually, that the japanese elites ended vegetarianism in favor of meat in the late 1800s.
It's something that is true everywhere - US, Europe, Japan, etc. As people ate a healthier diet with meat, the people grew taller and smarter on average.
Eating mostly polished rice or wheat is not optimal from a health perspective, so quite logically people transitioned from eating miserly diets to eating enough they started becoming taller, etc. That has very little to do with the meat itself and much more with the fact that people would previously mostly eat enough carbs to get by and children would never receive the best share in nutritional terms. Solve that and you probably can explain almost all of that effect. https://www.atlasobscura.com/articles/rice-disease-mystery-e... gives some insight on how primitive prescriptive dietary approaches were around the Meiji period. You can see the same magical thinking around the power of rice and meat in contemporary Madagascar and it's not pretty.
But we need freedom. And in a free country, people are free to decide what their needs are (as long as they are not breaking any laws). Some people need houses of prayer. As an atheist, I can argue that they don’t. But I don’t argue that, because it’s not up to me to decide what they need or not.