Yet this theory, expounded in 1798 in An Essay on the Principle of Population, one of the most influential books ever written, and now also routinely applied to oil and other resources, is bogus. Unlike rabbits, who are powerless to control their environment, the more we need, the more we eventually find a way of producing: the availability of food and oil are determined by technology and economics, not by some law of nature. Modern techniques (such as fertilisers, genetic selection or fracking) mean that agriculture and the extraction of commodities have become hugely more efficient.