I'm sorry, but you are completely wrong. There are many plants that produce much more protein per acre than beef: https://en.wikipedia.org/wiki/Edible_protein_per_unit_area_o...

Edit: I can't reply to child anymore, max comment depth reached. Anyway, I think my work here is done :) I am not demanding we stop growing lettuce, I am demanding we stop raising cattle for proteins. We can keep growing lettuce for vitamins / minerals. As for the so-called "absurd fake figure" for protein/meat land utilization, that figure is from 1970's. I'm willing to concede that number may have risen slightly with the use of antibiotics as growth stimulator ;)

P.S.: Legumes are a whole family of plants, divided into 11 major types.

You can't say "you are completely wrong" and then support that by showing I am right. You showed 5 crops that produce more protein per acre than an absurdly low fake figure for beef. That's precisely what I said, that we would have to cut down to just a small handful of highest value crops. 5 is a small handful, we currently grow thousands. You know full well lettuce produces fewer calories and less protein per acre than beef. But you are not demanding that we stop growing lettuce, just beef. Your demands are inconsistent with the premise you use to support them.