lol, i thought of using the earths magnetism to try and get a craft to levetate. if you hold two magnets at the same pole we all know ther reppel each other. if you control the direction in which they reppel you could use them to levetate and fly so to speak. the earth has its own magnetic field so we could try and manipulate a stronger variable magnet to repel off it in the desired direction, by variable magnet i mean one in which you could change the strength of pull. this would mean no fuel, better climate