Nuclear and fossil fuels are the PAST.
They both create more pollution and long term hazards.
As as far as putting carbon fibers in the air, the soot from fossil fuels is a far greater hazard,
Both carbon fiber dust and soot pose respiratory hazards, but differ in nature: soot (black carbon) from incomplete combustion causes systemic inflammation, lung disease (COPD, asthma), and cancer, while carbon fiber (especially nanotubes) involves fibrous particles that physically irritate lungs, potentially leading to fibrosis