The world as we have known it for the past century would have been very different without petroleum. Petroleum, particularly in the form of crude oil and its refined products, has been central to all aspects of modern industrial society and has been a major strategic geopolitical objective for nations. The 20th century was the age of oil, and at least part of the 21st century will be as well. Petroleum is used as an energy source and as a raw material for the production of an immense variety of chemicals and synthetic materials. Almost all the world's food relies on petroleum for fertilizer,...