"Geography determined that when the world warmed up at the end of the Ice Age a band of lucky latitudes stretching across Eurasia from the Mediterranean to China developed agriculture earlier than other parts of the world and then went on to be the first to invent cities, states and empires. But as social development increased, it changed what geography meant and the centres of power and wealth shifted around within these lucky latitudes. ... Extrapolating from these historical patterns, we can make some predictions. If the processes of change continue across the 21st century at the same rate as in the 20th century, the economies of the East will overtake those of the West by 2100."