Shipping companies are exploring an array of technologies to reduce fuel by adding wind propulsion to their vessels, including a ship chartered by commodities giant Cargill that’s using wingsails designed by a company that has its roots in the America’s Cup sailing race. How quickly can this new but old technology make a difference in maritime greenhouse gas emissions?We talk to Cargill Ocean Transportation president Jan Dieleman, BAR Technologies chief executive John Cooper and International Windship Association secretary general Gavin Allwright.

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