> This ignores the existence of climate change. Air travel is not sustainable and air travel is least amenable to conversion to hydrogen or electric. Which mea

> This ignores the existence of climate change. Air travel is not sustainable and air travel is least amenable to conversion to hydrogen or electric. Which means you’d have to use hydrocarbon fuel. Which can be chemically produced from atmospheric CO2 and water if you have enough carbon-neutral energy. Or you could sequester an offsetting amount of CO2 if that would be more efficient.