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Check out these inflatable wind sails that might soon start appearing on ships.
https://edition.cnn.com/travel/article/cargo-ships-sails-michelin-spc-intl/index.html
Some cargo ships do actually use sails to reduce fuel consumption!
Wind propulsion is the answer to the ever-worsening carbon emission crisis in the shipping industry.
Modern windmill ships are the future of the maritime industry; they can make sea travel greener and much cheaper.