[0xdde]

You are cherry-picking only one of the environmental issues that cruise ships cause. Even that aside, you are also ignoring a large part of the discussion in the first article you cite, which focuses on all of the other, acute, air pollution cruise travel causes in the port cities. Focusing on CO2 is a strawman.

[tgsovlerkhgsel]

I focused on CO2 because it's often cited and one of the more comparable metrics, and I used those articles only as sources for my estimates. Between the date of the article and today, significant new regulation for maritime fuels came out.

But the kind of environmentalists I am talking about aren't suggesting to regulate cruise ship emissions, they demand banning cruise ships, because they're a visible symbol of loosely-defined luxury/"excess", and thus any impact is seen as unjustifiable.