I just read an interesting article, though the click-bait title is a little misleading: A Vegan Diet Is Less Efficient For The Planet Than An Omnivorous One. The question is “less efficient” than what?
According to the study, a completely vegan diet for everyone would still be almost twice as efficient as the current situation.
The most efficient diet (for land use) in the chart was the 80% lacto-vegetarian (no eggs) diet. And they should have included another potential solution: entomophagy. 🙂
It takes almost 2,600 gallons of water to produce a pound of beef, but very little water to raise a pound of grasshoppers — and they taste fine.