One of the more interesting retro-futuristic ideas is to use wind power and large, high-altitude kites to help propel big oceangoing cargo ships: http://newatla

One of the more interesting retro-futuristic ideas is to use wind power and large, high-altitude kites to help propel big oceangoing cargo ships: http://newatlas.com/cargill-ship-will-be-largest-ever-to-utilize-kite-power/18005/ http://newatlas.com/cargill-ship-will-be-largest-ever-to-uti...