Im not sure I even agree that visual pollution should be a real thing. People like to pretend that there is a divide between man-made structures and "nature" but humans are animals and we construct our environment out of natural materials. Humans ARE natural and the things we make are not separate from nature. Obviously that doesn't remove our responsibility to avoid causing overall harm with toxic chemicals that pollute or structures that destabilize equilibriums, but that being said I dont think we should have this mentality about our structures being an inherent detriment to the area we make them in, and wind farms seem like a good example of good structures in a good environment to me. End rant.