At the present time, the Haber-Bosch process sustains well over half of the world's animal population. This is what's not sustainable on a global basis, even if

At the present time, the Haber-Bosch process sustains well over half of the world's animal population. This is what's not sustainable on a global basis, even if one country can do it. I saw corn fields when I visited England recently. Don't know the extent.