Earlier quoted context omitted.
The fact that we have so much monoculture soybean fields is that they make up the feed for the animals in Factory farming. Here is one link I just found that point out to the fact ‚70-75% of the world’s soy ends up as feed for chickens, pigs, cows, and farmed fish.‘: https://www.ucsusa.org/global-warming/stop-deforestation/dri...
You could pick any plant humans consume and it is inevitable that the vast bulk of it would be produced in large, efficient, monoculture operations. The delusion of small farms producing 'heirloom' vegetables in copious variety is a bourgeoisie fantasy of the western middle-class who has come no closer to a real farm than the local Whole Foods. The soy in your tempeh and tofu comes from those same farms, the same ope…
(BTW in the link i posted above it says human products take up 6% of soybean production.)