[kadkads]

That would only be true if they eat a pure grass diet. They do not. They are fed soy, which is perfectly edible for humans.

https://ourworldindata.org/drivers-of-deforestation

>More than three-quarters (77%) of global soy is fed to livestock for meat and dairy production. Most of the rest is used for biofuels, industry or vegetable oils. Just 7% of soy is used directly for human food products such as tofu, soy milk, edamame beans, and tempeh. The idea that foods often promoted as substitutes for meat and dairy – such as tofu and soy milk – are driving deforestation is a common misconception.

If we stop that, we free up a lot of calories for human consumption. I'd say the total amount of pure grass fed animals would be way lower, which would be better for the environment of course, and meat would be much more expensive. Actually, I like that. Good idea!