Electricity....
Just to put your mind at rest... there are plenty of ways to generate electricity that don't require oil, and there is plenty of oil left, with even more gas. Look up US shale gas as an example.

Proven reserves of oil are currently at 40 years based on current consumption and prices. Increases in price, and imprevements in technology will probably increase this even further. it will run out eventually, but we're not in end of days scenario just yet...
(fatharry, Mon 8 Nov 2010, 8:57, Reply)