Try to eat corn or grass used to feed animals. It's not going to end well. And a global supervolcanic eruption would disrupt the production of food worldwide,

Try to eat corn or grass used to feed animals. It's not going to end well. And a global supervolcanic eruption would disrupt the production of food worldwide, not just in a single continent. Therefore, I doubt we are not "more robust than ever", as you claim.