In such high-energy situations, the green alternative is most likely air-to-diesel, fuels derived from captured CO2 recombined with H into hydrocarbons. Compre

In such high-energy situations, the green alternative is most likely air-to-diesel, fuels derived from captured CO2 recombined with H into hydrocarbons. Compressed/liquified H2 can theoretically power an airliner, but for all that effort they could just use "green" manufactured hydrocarbons running though normal turbofan engines.