Oil (n.) The remains of ancient bacteria, conveniently liquefied and converted to pure combustible hydrocarbons.
Oil is of course the basis for modern civilisation, and we finish it off, we might do well to reflect on the fate of many past civilizations that ran out of essential raw materials and then collapsed.
Kübler-Ross wrote that the five stages of acceptance of a terminal disease are denial, anger, bargaining, depression, and acceptance. Most of the western world still lives in denial, and will probably slip directly to depression. I don't have anything against a major collapse of civilization. I just don't want to be there when it happens.