The most significant part of the carbon footprint is and remains the steelmaking. Decommissioning of the turbine itself should be easier than construction, and it was practised when the generators of all turbines in the Horns Rev offshore wind farm in Denmark had to be replaced in 2003-4, a year after commissioning (they were corroded due to faulty saltwater insulation design) - maybe Jérôme knows the costs involved and what became of the parts of the removed generators.

_{*Lunatic*, n.
One whose delusions are out of fashion.}