Of course there are far more freight vessels than cruise vessels, but I can imagine several valid reasons for targeting cruise vessels: - cruise ships are mark

Of course there are far more freight vessels than cruise vessels, but I can imagine several valid reasons for targeting cruise vessels: - cruise ships are marketed as luxury, and also have much higher profit margins than the shipping industry, so the argument that they can afford to switch to cleaner technologies is easier to make. - cruise ships also typically dock much closer to cities than other ships. You probably won't see a large oil tanker sailing up a Norwegian fjord or through Venice's Giudecca Canal.