[MadnessASAP]

There are some enormous issues regarding hydrogen storage that will need to be resolved before it will be usable on aircraft.

Pressure vessels are heavy, hydrogen is explosive, both of those are incompatible with aircraft.

[mschuster91]

That's why I said: "synthfuels made from hydrogen and sequestered CO2 as base chemicals."

You need to combine the hydrogen and CO2 into methane and from that into longer-chain liquid hydrocarbons, and that process is complex and energy-intensive even if you use microbes for the job.

[MadnessASAP]

Ohhhh.... That is what you said, apologies. Yes I'm all aboard the synthetic fuels train so long as it remains carbon neutral and can run at some reasonable degree of efficiency. Or we figure out how to make enormous amounts of power in a renewable and cheap manner.