Peak oil, old boy - research it and weep.
This chap is one of the most erudite speakers on "Peak oil" that I have come across. Taken from an interview in 2002. Although a little dated, it is all the better for seeing how his prescient views have played out. If nothing else it is a great history of oil in 13 parts. Well worth watching in total, if you have the time.
On the beach