OSLO—The world’s first fully electric and self-steering container ship, owned by fertilizer maker Yara, is preparing to navigate Norway’s southern coast. The Yara Birkeland, an 80-meter-long (87 yards) so-called feeder, is set to replace truck haulage between Yara’s plant in Porsgrunn in southern Norway and its export port in Brevik, about 14 kilometers (8.7 miles) away by road, starting next year. It will cut 1,000 tons of carbon emissions per year, equivalent to 40,000 diesel-powered journeys by road, and is expected to be fully autonomous in two years. For Yara it means reducing CO2 emissions at its plant in Porsgrunn, one of Norway’s single largest sources of CO2, Chief Executive Svein Tore Holsether said. “Now we have taken this technological leap to show it is possible, and I’m thinking there are so many routes in the world where it is possible to implement the same type of ship,” he told …