>just 15 of the biggest ships emit more oxides of nitrogen and sulphur—gases much worse for global warming than carbon dioxide... Oxides of sulphur are not gre

>just 15 of the biggest ships emit more oxides of nitrogen and sulphur—gases much worse for global warming than carbon dioxide... Oxides of sulphur are not greenhouse gasses. Nitrous oxide is a greenhouse gas but it doesn't come from burning fuel. These links go into the actual reasons these sorts of pollutants are bad: * https://en.wikipedia.org/wiki/NOx#Environmental_effects https://en.wikipedia.org/wiki/NOx#Environmental_effects * https://en.wikipedia.org/wiki/Sulfur_dioxide#As_an_air_pollutant https://en.wikipedia.org/wiki/Sulfur_dioxide#As_an_air_pollu... Interestingly enough, there is some thought that nitrogen oxide emissions from ships actually cause global cooling.