The whole point is that you need way more crops in general to "produce" the same amount of calories & proteins. That's because feeding the animals with crops instead of eating them is highly inefficient in comparison to eating them directly.
"As an example: beef has an energy efficiency of about 2%. This means that for every 100 kilocalories you feed a cow, you only get 2 kilocalories of beef back."
With how much meat is eaten right now, there is just no way we have enough grazing land to produce enough meat. 99% of meat comes from factory farms. [1] These animals are always fed with crops, so there will always be land usage to product food for animals. And it is way more inefficient.
Of all the cropland we have, 57% is used to produce human food and 43% is used to produce animal food.
https://ourworldindata.org/land-use-diets#more-plant-based-d...
The whole point is that you need way more crops in general to "produce" the same amount of calories & proteins. That's because feeding the animals with crops instead of eating them is highly inefficient in comparison to eating them directly. "As an example: beef has an energy efficiency of about 2%. This means that for every 100 kilocalories you feed a cow, you only get 2 kilocalories of beef back."
https://ourworldindata.org/land-use-diets#livestock-waste-a-...
With how much meat is eaten right now, there is just no way we have enough grazing land to produce enough meat. 99% of meat comes from factory farms. [1] These animals are always fed with crops, so there will always be land usage to product food for animals. And it is way more inefficient.
[1]: https://www.livekindly.com/99-animal-products-factory-farms/