That's a trash article, and Antarctica is the last place anyone should worry about cruises going unless they are chopping up penguins for bird-brunch or something.
The problem is not only the cruise itself, but also all the energy spent getting the people and supplies to run the cruise. Plus the ecosystem is especially fragile, and the Antarctic glaciers are melting too fast as it is, calving icebergs which further damage the environment.
It's no more energy than going on a Pacific cruise
Ships are actually very energy efficient, those people probably would use more gasoline during their daily commute since each of them would drive a car or take a cab. If they went on a plane somewhere for vacation, it would use a lot more fuel
As a matter of fact, yes. I was talking to a vet at a friend's wedding, and he casually mentioned that working with simians is a dangerous field for many reasons that you wouldn't think of, like their herpesvirus strains killing us.