frankv:I think your figures are way off. Some back of the envelope calculations:
A steer might give you 200 or so kg of beef = 1,000 servings. Stocking rate of 3 animals/hectare for 2 years. So that's 1,500 servings /hectare/year
Cabbages at .25sq m each = 400/hectare/year How many servings do you get from a cabbage? 8 would give you 3,200 servings /hectare/year
So cabbages are about twice as efficient at feeding people compared to beef. But they don't fart.
Cabbages might not fart, but there’s going to be plenty of farting if our new climate-friendly diet is cabbage-based



