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“The researchers took data on reconstructed historical weather – a so-called hindcast – in the Atlantic Ocean over one year and used a computer model to work out optimal routes and speeds.
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On average, the energy consumption of ships taking the optimal routes would be 75% lower than those taking direct routes, the team found. Schwedt presented the results at a recent meeting of the European Geosciences Union in Vienna.”

https://www.newscientist.com/article/2526648-wind-assisted-cargo-ships-could-more-than-halve-shipping-emissions/