Https://www.cargomaster.com.au/wp-content/uploads/2012/08/img_slider_05-564x350.jpgThe Finnish business has designed “rotor sails” — composite cylinders about 33 yards (30 meters) tall which can be fitted on ship decks and spin in the breeze. Air force variations on opposite sides with the whirring equipment assistance drive a vessel forward. WSC has also for many years been http://Conservablogs.com