The document discusses potential materials for wind turbine blades including PVC, wood, fiberglass, and polyurethane reinforced with carbon nanotubes. PVC and wood blades are lighter but more brittle with shorter lifespans. Fiberglass provides strength but can break and crack easily. Polyurethane reinforced with carbon nanotubes is a stronger and lighter material that outperforms current resins, though it is heavier and more expensive than alternatives like PVC or wood.