Sadly, it’s not obvious at all. A few years ago, there was an article like this about the 16 most polluting freighters. Ever since then, I have seen the “fact” that ships emit far more CO2 than all cars put together repeated over and over again.

> "obviously all of the CO2 is coming from the cars."

Wait, how do ships eliminate their CO2 emissions?

Re:

> "A ship, burning 1 litre of bunker oil produces about as much CO2 as a car burning 1 litre of gasoline"

If burning bunker oil produces CO2, as I would expect it does, then obviously all of the CO2 is not coming from cars.

I understand making 'broadly true but strictly speaking flat wrong' generalized statements, but to do that in the same breath as criticizing somebody for making "garbage claims" seems... I don't know, worthy of note I guess.