Taiwanese container line Yang Ming Marine Transport said it has fulfilled its "green promise" by cutting carbon emissions by 51% last year.
The company, which also has bulkers, said the figure is a culmination of work it has put in since 2008 to cut its greenhouse gas output.
The 51% applies to emissions per teu-kilometre, which beats the IMO's target of a 40% cut by 2030 and 50% by 2050.
