I wouldn't underestimate our capacity to fuck up the planet. When the food runs out and the water riots spread, things are going to go south very quickly for the human race. We like to make post apocalyptic movies about how we survive in the desert that used to be Iowa, building war-cars from scrap and isolated communities from the remainders. The reality is that almost everyone will die off without the electricity, medicine, and food production we have all come to rely upon. Gasoline will expire in the tanks of a million cars, and the ammo will run out faster than the potato chips. Farms will be pillaged, and GM seed stocks don't produce a new generation.

When society breaks down, all the little things will fall away, and we'll all realize how actually few survival skills people actually have.