You can't get away from the reality that Shipping is a business with companies always looking for an advantage. However rather than reinvent the wheel there are efforts to explore and put into practical use the harnessing of wind power as a way to reduce costs and in doing so reduce the pollution producing by using only a Diesel engine.
The following article provides both a picture of what that looks like and some feed back from a Captain who has experienced the Rotor Sails on his ship.