The Rainbow Warrior III is specifically designed to support the campaigning activities of Greenpeace International. The ship sails primarily under wind power. Its 55m-high A-Frame mast system can carry far more sail than a conventional mast of the same size. This is the first time this design has been installed on a vessel of the Rainbow Warrior's size.
The Warrior does have electric drive engines to help out when the weather isn't suitable, but these are also built with sustainability in mind.