“We do not know whether later ages will still rely on the same raw materials on which we depend today. It is true that the exhaustion of the oil deposits and even those of coal is progressing at a quick rate.”

“But it is very likely that in a hundred or five hundred years people will resort to other methods of producing heat and power.”

- Ludwig von Mises, Human Action

That was written in 1940. Mentally this guy was about a hundred years ahead of the rest of us…