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At $30 a barrel shale oil becomes profitable which means known reserves are many times previous known reserves. We aren't going to run out anytime soon, and since technological advances increase fuel efficiency and make previously unprofitable sources of energy profitable, it is unlikely we will EVER run out completely. A better question is how much will oil cost in the future, and at what point will alternative sources of energy become economical. I suspect it is still many years in the future.

Doomsayers have been wrong 100% of the time. People who once believed the world was doomed to another ice age now believe in global warming. People who once believed that the world was going to run out of food due to overpopulation are now worried about underpopulation. Not sure why anyone listens to them anymore?

I think the $30 figure for oil shale is a little old. I saw that figure in 1980 or so. The waste material (processed shale) is also a problem... It becomes 33 percent larger after the oil is harvested.