Porto is nearly synonymous to port wine, and also its rich history. The city's historic center and the Alto Douro Wine Region have been listed as UNESCO World Heritage Sites.
Whatever the underlying cause, last year’s extreme warmth in the West meant that Alaska, Arizona, California and Nevada all set temperature records. Some parts of California essentially had no winter last year, with temperatures sometimes running 10 to 15 degrees above normal for the season. The temperature in Anchorage, Alaska’s largest city, never fell below zero in 2014, the first time that has happened in 101 years of record-keeping for the city.
Mr Na said that although South Korea had signed a trade agreement with China, there were plenty of other ways in which Beijing could punish Seoul.