According to some scientists, we may very soon be at Peak Oil, the point at which petroleum demands surpass all possible production due to declining reserves. The consequences of this forseen development in every aspect of life are staggering to think about.

BBC NEWS | Science/Nature | End of oil heralds climate pain

Here are also two short movies (about 50 minutes apiece) about Peak Oil:

Robert Newman History of oil - Google Video

Oil, Smoke & Mirrors. - Google Video