The huge blades are made of carbon fiber, fiberglass, and balsa wood and require a lot of raw materials and energy to produce and transport to the field.
Once in use they eventually wear out due to exposure and the forces they are subjected to.
So they must be replaced at regular intervals before they fail and cause even more damage to the generators and structures.
And finally, they old blades are not recyclable and are costly and difficult to remove and dispose of.
Gasoline and diesel fueled helicopters, trucks, trains and tools are used to remove, replace and discard the worn out blades.
Then the old blades are cut into pieces and transported to huge burial grounds in places like West Texas and Wyoming.
They are not bio-degradable so once buried they will remain intact for millennia.
One additional thing to consider - Imagine the much greater difficulty, expense and use of "fossil fuels" to replace blades on the towers located in the seas and oceans.
Thousands of Old Wind Turbine Blades Pile Up in West Texas
https://www.texasmonthly.com/news-politics/sweetwater-wind-turbine-blades-dump/
"By 2050, Used Wind Turbine Blades Will Exceed 43 Million Tons Of Waste"
