Capture CO2, store it underground and let long-haul air traffic continue on 'black' jet fuel. This is how the controversial recipe sounds, which according to several experts could be a temporary way to CO2-neutral air transport, writes The Engineer.
- It may make sense that the planes that cannot fly on carbon-free fuels continue to fly on fossil fuels, says Tobias Johan Sørensen, who is a senior analyst at the think tank Concito.
However, the prerequisite is that the fuels are made more climate-friendly by adding hydrogen. And then a tax must cover the costs of capturing atmospheric CO2 – so-called direct air capture (DAC) – as well as subsequent storage.
- The full price is paid to remove the emitted amounts of CO2 from the atmosphere using DAC, says the senior analyst.
The background for Concito's proposal is, among other things, that biomass may become a scarce resource in the future.
Same notes from the Climate Movement
So far, the arrow has pointed to the fact that the largest aircraft after 2050 must fly on, for example, fuels based on hydrogen produced on green electricity in combination with CO2 captured from the burning of biomass in particular.
Here, Concito's analyzes show that it can benefit the climate more to use hydrogen as a fuel alone or for the production of, for example, ammonia, while the green CO2 must be stored underground.
The climate council's deputy chairman Niels Buus Kristensen also proposes an extended playing time for fossil fuels against payment to store CO2.
In a written comment to the Engineer, he explains that aviation will fly on carbon-containing fuels for the next two to three decades, after which some aircraft may be able to fly on hydrogen.
- A controversial alternative until then is to continue using fossil fuels, writes Niels Buus Kristensen.
His proposal differs from Concito's in that the compensation must be found by storing chimney CO2, which would otherwise be used for the production of sustainable aviation fuels.
- It would have the same climate effect (as flying on green fuels, ed.) if done correctly, says the climate council's deputy chairman.
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