On: Some scientists are serious about resurrecting zep...

[dr_dshiv]

Also, they could harvest sea water or condensation to generate hydrogen.

To produce one kilogram of hydrogen, 12 cubic meters, it takes 9 kg of water and 50 kWh of electricity. The solar Zeppelin described above could generate 2,589 cubic meters of hydrogen a day. At this rate, it would take 77 days to fill the Graf Zeppelin's 200,000 cubic meter capacity

[dr_dshiv → dr_dshiv]

So, perhaps we could float giant plastic solar balloons in a lake -- and semi-organically "grow" enormous hydrogen cells for aerostatic lift.