The blades used for wind turbines are gigantic pieces of plastic filled with (reinforced with) glass or carbon fibers. They may be as long as a hundred meters and weigh tons. There are many reports of their having to be removed after a life of many years. I have not seen a reason why their lifetimes are decreed over, though UV or oxygen attack seems to render them corrupted. In any case, what to do with them at the end of life is a major problem since they are so cumbersome. For the most part, all of the plastic and valuable components are ignored as they are cut into shorter pieces and buried in dumps.

Here is one article which describes a new resin that can be dissolved in methanol at the end of life to free up the fiber fillings. What happens to the resin-methanol mixture is not specifically spelled out, though it is probably discarded while the filling may be saved. As usual, there is no thought to redesigning the blades so that they can be reassembled or refurbished to be used qua blades, only how to dismantle them molecularly into byproducts of doubtful value. This destructive process is of course called “recycling” and elevated into the sole possible fate of the blades in one article after another. Along those lines see this article in Science.