Earlier quoted context omitted.
> We could rewild huge parts of the Earth Probably not without radically changing how we grow plants for human consumption, assuming we still eat plants and don't move to an all-meat diet. Looking over the data for the area I farm, according to government figures, 36% of the cropland is used for animal food. Most farmers here grow a rotation of soybeans, corn, edible beans, and wheat. The edible beans and wheat are i…
What do you use for fertilizer today, and where does it come from? Is there a scaling concern there, as well?
Technically it can be extracted from the same seawater it's running off into, but IIRC that hasn't been demonstrated in a cheap enough way yet.