Pete Alcorn talks on TED about the world in 2200. His main message is that a pessimistic outlook can result in some hasty decisions and suboptimal management of the complex social and technological transition the world will undergo. A positive mindset, on the other hand, results in creative solutions to even the most intractable problems. Yes, indeed, this is precisely what the Romans lacked in 410 AD; and the French knights in 1415; and British Light Brigade in 1854; and the Polish cavalry in 1939; and the bankers, plus all sorts of other "investors," in 2007...