The use of Arctic shipping routes is doubling this year as global warming makes it more convenient to traverse the Arctic Ocean when servicing Russia, Europe and Eastern China.   Escorted by Russian ice-breakers, the Arctic routes are being used from now until October. The first vessel to use the route this year is a Singaporean tanker, carrying gas condensate from the Russian Novatekc Purovsky gas processing plant to the city of Ningbo on China’s eastern seaboard. The arctic route ...