wired.com reports a new Korean idea to use huge kites (or parafoils) to tow a vessel and in-turn generate electricity to power the the production of Hydrogen fuel from seawater.
As wacky as it might sound there are numerous groups already developing “sky sails” who reckon fuel consumption of ocean shipping can be reduced by 35%.
Since windspeed increases drastically with altitude a 6.5 million sq-ft sail 1 mile in the sky would capture a lot of energy!