““long. Trade has always traveled and the world has always traded. Ours, though, is the era of extreme interdependence. Hardly any nation is now self-sufficient. In 2011, the United Kingdom shipped in half of its gas. The United States relies on ships to bring in two-thirds of its oil supplies. Every day, thirty-eight million tons of crude oil sets off by sea somewhere, although you may not notice it. As in Los Angeles, New York, and other port cities, London has moved its working docks out of the city, away from residents. Ships are bigger now and need deeper harbors, so they call at Newark or Tilbury or Felixstowe, not Liverpool or South Street.””
