[aquarium87]

You underestimate what happens without oil. First, every tree in the world will be cut down, except perhaps the Amazon. Then billions will starve as there is no fertilizer or transportation. The cities collapse, sending hoards of refugees seeking food to raid farms.

In short, everyone becomes a killer or dies. And gun toting small scale agriculture becomes the norm.

Around this time the world's wood will be exhausted, and only the middle latitudes will be habitable.

No mining will take place. No chemicals for purification. No new green energy. No new batteries.

Etc etc. Etc.