The Hubbert Peak theory deals with some of the science behind Peak Oil.

Peak Oil theory is in essence the end of cheap energy. Keep in mind Peak Oil is only one of the topics that tie into a Global Power Down.

BP's Global consumption rate report for oil as of 2007.

BP's Global production rate report for oil as of 2007.

BP's Report on proved oil reserves as of 2007

The United States Department of Energy risk assesment on Peak Oil theory.

More suggested reading to come...