Europe and North America, we are told, are less dependent on energy-intensive heavy industry than in the 1960s and 1970s. It seems we squeeze more GDP out of a barrel of oil than in those benighted days.
To make a love story, you need a couple of young people, but to reflect on the nature of love, you're better off with old ones. That is a fact of life and literature - and of the novel ever since it fell in love with love in the 18th century.
Suicidal violence is not the exclusive property of the Muslim world. Suicide bombings were a tactic of nationalist struggles in 19th-century Europe and Russia, the far east during the second world war and the Vietnam war, and in modern Sri Lanka.
There are signs that the age of petroleum has passed its zenith. Adjusted for inflation, a barrel of crude oil now sells for three times its long-run average. The large western oil companies, which cartellised the industry for much of the 20th century, are now selling more oil than they find, and are thus in the throes of liquidation.
Even before he came to power in 1997, Gordon Brown promised to change the accounts to parliament from simple litanies of cash in and cash out, to a more commercial system that took notice of the public property the departments were using. This system is known as resource accounting.