Vitamin B12 deficiency in vegans is a pretty obvious one.
But this is ignoring my point: if you go to the billions of people in the developing world and tell them they're going to have to switch their diets to soylent green because we, the first world, emitted too much CO2, they will rightfully tell you to fuck off.
But this is ignoring my point: if you go to the billions of people in the developing world and tell them they're going to have to switch their diets to soylent green because we, the first world, emitted too much CO2, they will rightfully tell you to fuck off.