If you have a moment please take a look at the reporting from pcwindfarm.com regarding sound
It mentions a great article : Ambient Noise Is “The New Secondhand Smoke”
It is interesting that the Wind Farm companies hire experts that point only the 1000hz wavelength is a concern and attribute the noises from the wind turbines to singing birds and babbling brooks. All while maintaining 40 dbA is safe and not a cause of creating a nuisance. My toilet was running loud, so I grabbed my decibel meter and measured how loud the fill tank was, I can tell you at 35 dbA – it is a nuisance.