> Ocean-going vessels produce just 3% of its greenhouse-gas emissions. But the industry is dirtier than that makes it sound. By burning heavy fuel oil, just 15 of the biggest ships emit more oxides of nitrogen and sulphur—gases much worse for global warming than carbon dioxide—than all the world’s cars put together.

It starts out with the pretty clear statement, that in terms of green house emissions they are small, but that doesn't make them not a problem. Isn't that a fair thing to point out? Shipping should absolutely do more towards stopping pollution.

Maersk is an example of a company that at least keeps this in mind - http://www.maerskline.com/en-bs/expert-blogs/guest-blogger/b...