The trade in oil, gas, gems, metals and rare earth minerals wreaks havoc in Africa. During the years when Brazil, India, China and the other "emerging markets" have transformed their economies, Africa's resource states remained tethered to the bottom of the industrial supply chain. While Africa accounts for about 30 per cent of the world's reserves of hydrocarbons and minerals and 14 per cent of the world's population, its share of global manufacturing...