Yara Birkeland will cut 1,000 tonnes of carbon emissions per year
The concept imagery shows a massive flying drone station based in the stratosphere
It will transport its first container from the town of Herøya to Brevik in Norway
Unmanned boats are becoming cheaper to build thanks to low-cost equipment and 3D printing
The unmanned freighter will replace 40,000 truck journeys each year
Grayling predicts autonomous shipping revolution - just weeks after Maersk CEO claimed it wouldn't happen
Self-sailing container vessels won't generate significant cost efficiencies, even if regulators allow them, claims Skou