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A number of websites have claimed that ‘15 of the largest ships emit as much pollution as all the cars in the world.’ That is a very catchy statement which gives an indication of the pollution produced by shipping containers around the world. But is it true? We look at the different types of emissions produced by container ships and cars. Presenter: Tim Harford Producer: Charlotte McDonald and Jordan Dunbar (Photo: The ultra-large container ship MOL Triumph, from South Korea, coming in to port. Credit: M.MacMatzen/Getty Images)