What are wind turbine blades made of?

 

I had always assumed that the blades were made of low density metal like aeroplane wings. Turns out they are made of carbon fibre and are thus not recyclable. The Guardian ran an article about 5 years ago about the problems of recycling carbon fibre. See also https://www.latimes.com/business/story/2020-02-06/wind-turbine-blades