People were frequently starving to death. There is not a plausible route from agricultural pollution to killing the 7 billion people. There is a plausible rout

People were frequently starving to death. There is not a plausible route from agricultural pollution to killing the 7 billion people. There is a plausible route from disrupting large-scale agriculture to hundreds of millions+ starving, although they mostly would just ignore any organic, small-scale mandates.