The major source of energy in history is wood, not coal.
The population of humans is not frontloaded, meaning there's exponentially more now than at the beginning, so in that context it would be coal. Natural selection ended with the industrial revolution and population skyrocketed afterwards. The cause is claimed to be that far more people died in childhood beforehand and don't afterwards. In other words, technology forces K-selection only populations. Places like Africa full of R-selection populations then have technology they never would have created themselves leak into their domain from K-selection groups like whites and asians, making them spread out of control.
The K-selection groups are then required to either build a wall to contain the more primitive R-selection populations, or wage war against them to prevent them from outbreeding everyone and overunning the other groups and causing them to go extinct like some sort of biological virus.
