Wind turbines, or rather, their materials not the objects, can be salvaged but not entirely.
- The metals, yes, by re-melting them (needing a lot of energy).
- The blades no: Those are made at least partly from synthetic composite materials such as carbon-fibre reinforced resin.
The composites include synthetic-resin bonded paper and fabric, and the thermosetting plastics ('Bakelite' and its modern versions); and the vast tonnage of glass-fibre that has accummulated over the decades in buildings, boats, vehicles, and many luxury items. The last too, in both raw fibrous form (mainly building insulation) and resin-bonded mouldings (e.g. boat hulls, flat roofs).
About the only possible use for such material when scrapped would be granulating it to form a filler for new types of mouldings. I do not know if this can be, or is, done.
The resin itself of course, is made from.... petroleum derivatives. As are the electrical insulating materials, the hydraulic and lubricating oils, and the protective paints, all necessary in wind-turbines.
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Solar Panels? The glass and the metals are salvageable. I am not sure about the active materials; nor how recoverable are the materials in the accompanying battery-banks.
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Offshore wind-turbines' effect on animals? I think the difficulty is not that of deafening or frightening marine animals as seismic charges can by simple acoustic intensity, but of disturbing them by continual background noise interfering with or masking their calls. So not "hurting" them by injury but by affecting their normal behaviour.
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Oh, and for the record I wrote that from basic, lay-level, general engineering and science knowledge. I do not work for either the petroleum or "green-energy" industry, and vote neither Republican nor Democrat. I am not even American.
