Apologies. It appears that a lot of text was missing from this poem's footnotes. It should have read, "Beef required 28 times more land, six times more fertilizer and 11 times more water compared to food sources such as pork, chicken, dairy or eggs. Beef also required as much as 160 times more resources to produce than on a calorie-to-calorie basis than potatoes, wheat or rice."
Personally, I eat Vegan (the diet, not the people). But I was a Carnist for many years before, and am in recovery.
Lol there you are! Thanks for the clarification ;)