Proctologically Violated©® wrote:
You are absolutely correct.
The "efficiency" of of growing animals is about the same as that of a
gasoline engine: 33%.
Which means you lose, from the gitgo, about 2/3 of the food calories
the land can produce in grains etc.

Except there are millions upon millions of acres used for grazing that would
not or could not be used for grain......thus allowing food production where
none would exist......There are many more millions of acres used for hay,
alfalfa etc. that are not ideal or useful for other food production.

We as well have no significant or appreciable need for more grain production
as the world has never been as dependably well fed.....optimum calorie
production is really only significant at the sustenance existence
level.....thankfully we are not. Rod