King coal is still a finite resource and there is an increasing demand (read growing demand)for it. Sound familiar?
So the King is quite likely just as naked as Emperor oil. I'm sure others on this site can fill in the technical details with the nice graphical analysis. Peak Coal anyone?

Ironic that this was the quote the appeared just as I hit the post button for my previous comment:

“I'd put my money on solar energy… I hope we don't have to wait til oil and coal run out before we tackle that.”
—Thomas Edison, in conversation with Henry Ford and Harvey Firestone, March 1931