Mr. Barton equates the two by comparing a city the size of Ithaca, N.Y., to the continent of Europe. “Ithaca is quite complex in its own right if you think of all that goes on,” he said. “If we scale up the population to 730 million, we come to Europe as about the right size. Now take Europe and shrink it until it all fits in about the same land mass as Ithaca.”
