This is incorrect. There yes more land that can be grazed by various edible animals than can be practically farmed. And, as the animals graze, they can help increase arable land. It's a positive feedback cycle if done with some thought and an occasional push in the right direction.
Discussion
I'm not trying to be mean but have a look again at the world map, see how much water, desert, forests, mountains and agricultural land there is.
We can cut all the forests but that's not a solution, in Amazon is not going great.
All the agricultural land in the world belongs to someone. If they're not all growing happy cows probably there's a reason for that.
I have, a little. And not every piece of land can support cows. But goats and sheep? Delicious, useful, and transformative. Yes, Bill Gates is buying a crapton of farmland in the US to push production to his cancer foods. Yes, the Amazon is under pressure. But, if you can get outside of the cities, you can probably live a much better, healthier life than you could otherwise. No, not everyone can do that, but, it's a goal and more people can reach it than they might realize.
I get you, sounds wonderful, but we are 8 billion. We can hardly feed people on 3rd world like it is now. Billions have almost nothing to eat. And we can't go and addopt communism or killing billions.
There's not enough land available for everyone to eat happy cows. Most people will only eat sad cows for 100 years. Then lab meat.
We currently produce too much food. The issue is geopolitical nonsense getting in the way of distribution. (We can agree that Fiat is the cause of most of that, yes?) even at 10 billion (the approximate global maximum based on population tendencies and projections I've seen, +/- half a billion), we can produce enough decent food for people to not starve on the land we already use for farming, though, I propose we move to a decentralized, distributed food system, which will prove more robust, diverse, flexible and healthier than industrial monocropping which is poisoning the earth, the air, the water, and us.