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2 years agohttps://www.theguardian.com/travel/2006/dec/20/cruises.green
Not at all. This article is 17 years old and planes have only gotten more efficient whilst the same old cruise ships continue to so the seas.
Plus a more recent article
https://www.treehugger.com/what-is-greener-boat-vs-plane-emissions-5185547
Move fast, break things, leave the front door unlocked, salute the führer