Are we running out of oil?
Seems like a stupid question. Of course we're running out! There's only a finite amount of oil in the Earth's crust. So being nonrenewable, every barrel of oil that is extracted and burned is a barrel less of oil that exists.
Eventually we'll run out -- or so says conventional wisdom.
Conventional wisdom, however, often is handicapped by a poor grasp of economics. And among the important lessons of economics is that the supply of resources is less a matter of physics than of, well, economics.