To the editor:
Audible wind turbine noise may or may not be a problem, depending on your proximity to the installation. What I've never heard discussed is "infrasound."
Infrasound is an important component of noise that most city planners never heard of or turbine manufacturers might be reluctant to discuss. It is a low level noise below the sounds that are audible. It undoubtedly affects the ear.
Infrasound can be compared to sunlight. We see a little bit of sunlight and assume we're OK because we are not standing in it, however, it's exposure to ultraviolet rays that are harmful, as will be infrasound.
Long term infrasound exposure disturbs sleep. Ultralow pitch of an earthquake can be felt by animals and sensitive humans. Whales use infrasound as weaponry. Certain whales use blasts of the inaudible sound to stun their prey.
The common belief is "If you can't hear it, it can't affect you." False! I would suggest that city, county, township planners do some homework before approving lease rights to wind turbine farms and include a bit of escrow money to handle the coming litigation.
I must reluctantly agree that wind turbine electric generation has a place, however inefficient, on vast unpopulated areas, a small farm or even a very small community. There are many other negative considerations that will keep it from ever being the flavor of the year.
Charles E. Deibert