Interesting article. Thanks for posting.

I liked this part:

For these pre-industrial countries, the value of energy deposits depended on the cost of transportation rather than the cost of gathering the fuel itself. There exists no period in history when a global, continental or even national shortage of wood occured. The problem was always local, caused by deforestation around urban (and industrial) centers."

This is PCO in a nutshell. No shortage of energy. Shortages of cheap (extractable or transportable) energy.