I take it you believe the Guardian is wrong / misleading / imprecise here? (as are a dozen or so more recent articles)

- https://www.theguardian.com/environment/2009/apr/09/shipping...

> One giant container ship can emit almost the same amount of cancer and asthma-causing chemicals as 50m cars, study finds

> Confidential data from maritime industry insiders based on engine size and the quality of fuel typically used by ships and cars shows that just 15 of the world's biggest ships may now emit as much pollution as all the world's 760m cars.