I did a google Search on the Topic of Carbon Capture and Storing of it.
I assume the Sawdust is not on the airframes themselves, rather the airline would fund sites that use the Sawdust technology as a medium to store the CO2 as it is the most cost effective solution at present.
However, this field of Co2 Capture is way outside my area of expertise 🙂
In my air force career I did work on a few airframes that used something like a Catalytic converter
to filter air outside the airframe before it was used for breathing and pressurization within the air frame.
And of course those crews also had O2 available.
Work or handling of the filters within these converters was considered Hazardous and required a Full HazMat suit.
Of course I have yet to have seen any publicity as to if North America was to manage zero CO2 emissions within the next ten years
and Asia continues to unless it’s unlimited amounts of CO2
will the Earth be in any better shape in 25 years ?
Of course that last comment leads us to a much broader discussion,
which is a whole lot of Doom and Gloom.