Considering our problematic issues,
- Emissions at high altitude
- ~10,000 premature deaths per year from airline emissions
This is an area of concern where it's worth asking some stupid questions.
What would happen if a hose was attached to the core/hot nozzle of a turbofan, diverted to storage on the body? Could it still be efficient 'enough' (assuming a highest possible bypass ratio) to compress and carry some of that carbon dioxide to the next airport?