of our worst problems in the past - why Hitler won an election, why the sub-prime bubble happened, why Africa lingered in poverty when Asia did not, why the euro is a disaster - and will be the scourge of this century too. And although we neglect, defy and ignore them, bottom-up trends still shape the world. The growth of technology, the sanitation-driven health revolution, the quadrupling of farm yields so that more land could be released for nature - these were largely emergent phenomena. So was the internet, the mobile phone revolution and the rise of Asia. In this wide-ranging, highly opinionated non-fiction narrative, Ridley draws on anecdotes from science, economics, history, politics and philosophy and examples drawn from the scientific literature, from historical narratives and from personal anecdotes.