Comment Re:We have multiple solutions (Score 1) 69
In the real world gas turbines can burn vegetable oil which is significantly more efficient than fermenting grain to ethanol. This is called SAF - sustainable aviation fuel.
An alternative real world solution is biomass pyrolysis to methanol and then reforming methanol to any chosen hydrocarbon using the Fischer-Tropsch process (invented in my former home town in 1925 by the way).
In the real world synthetic fuel can also literally be created out of air, water and electricity. This is called eSAF or Power-to-Liquid. The way it works is splitting water to hydrogen and oxygen (water electrolysis) and splitting the carbon dioxide from the air into carbon monoxide and oxygen (thermal decomposition) and then combining hydrogen and carbon monoxide to any desired hydrocarbon using the aforementioned Fischer-Tropsch process.
None of this is science fiction or needs star trek replicators. All the required engineering has been done during WW2 since Germany had no oil.