Before the oil runs out: How will this era end?

Before the oil runs out: How will this era end? | csmonitor.com:
by John Dillon -- Sept 20, 2005
"Part of the worry has to do with access. Of the original 6 trillion to 8 trillion barrels in the ground, the industry is capable of extracting only about half - 3 trillion to 4 trillion barrels. Lots of oil is locked in difficult underground formations that are hard, if not impossible, to exploit using current technology.
Moreover, those first 1 trillion barrels were among the easiest to reach. The days of easy gushers and overnight millionaires are long gone. Now the going gets harder."