> It's important to note that almost all of the land that cattle are raised on is unsuitable for any other purpose.

This is blatantly false. It might have been true 70 years ago, but not since the rise of CAFOs or a large international beef market.

* ~70% of US beef comes from a CAFO (where the primary feedstock is corn) [0].

* In the US alone the amount of corn diverted to livestock feed (predominantly beef) could feed 800 million humans [1].

* Brazil produces ~15% of the world's beef (2013) and much of this land (65 Mha) was reclaimed from the Amazon [2].

[0] https://docs.google.com/spreadsheets/d/1iUpRFOPmAE5IO4hO4PyS...

[1] https://news.cornell.edu/stories/1997/08/us-could-feed-800-m...

[2] https://www.sciencedirect.com/science/article/pii/S026483771...