Thick, foul, and slippery, oil is not pretty, but it drives our world. Without it, life as we live it today would be impossible. Oil fuels our engines, heats our homes, and powers our machines. Nations have gone to war, lives have been lost, and fortunes have been made, all in the quest for oil. As its abundance shrinks and our dependence on it continues to grow, choices that are made will require sacrifice if we are to maintain an existence that will be sustainable for generations to come.