Good for Key West residents for voting to restrict cruise ships. https://www.ecowatch.com/key-west-bans-large-ships-2648990816.html?rebelltitem=3#rebelltitem3
Probably it is no surprise that cruise ships cause environmental harm. Many get poor grades in the Friends of the Earth report card. https://1bps6437gg8c169i0y1drtgz-wpengine.netdna-ssl.com/wp-content/uploads/2020/09/Cruise-Report-Card-2020_Final.pdf
Cruise ships get bad press when there’s an illness on board, but we may not be as aware of their environmental impact. It’s not just volume (e.g., waste) but materials used. For example, “bunker fuel” is much dirtier than what we put in our cars and anti-fouling paints have large amounts of metals. https://daily.jstor.org/the-high-environmental-costs-of-cruise-ships/
You can search for and read articles on this subject like this one: https://www.forbes.com/sites/jamesellsmoor/2019/04/26/cruise-ship-pollution-is-causing-serious-health-and-environmental-problems/?sh=1e0acf5737db
It’s the start of the season for cruising so perhaps this year when the virus is giving people pause about cruising perhaps we could take a deeper pause on their impact on the environment.