Such a pure nonsense of an article. For a start, cars are used in urban environments. For the most part, these ships are out at sea where pollution does not cause the same issues. These ships are running 24/7, cars tend to do about two hours work per day at most and finally, container ships carry thousands of tonnes of goods. Cars are mainly carrying a driver and nobody else!
Greenies really annoy me when they do not compare like with like.