Cargo ships are the world’s worst polluters, so how can they be made to go green?

Every day the clothes, tech and toys that fill the shelves in our shopping centres seem to arrive there by magic. In fact, about nine out of 10 items are shipped halfway around the world on board some of the biggest and dirtiest machines on the planet. It has been estimated that just one of these container ships, the length of around six football pitches, can produce the same amount of pollution as 50 million cars.
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