Serious studies about the possible health risks of wind turbines are starting to crop up, like the one announced in the Globe and Mail this morning as well as the work done by Dr. Nina Pierpont. All of the health concerns that I've read about so far are centered around the turbines emitting extremely high levels of infrasound (sound below the threshold of human hearing: about 15hz).
The New Zealand Wind Energy Association claims that modern wind turbines don't emit nearly the same levels of infrasound as older turbines do. And though I am somewhat suspicious that this site may have a slightly biased agenda, it does seem clear that engineers are aware of the infrasound problem and are aggressively moving to address the issue in future turbine design. A recent conference in Denmark was held to discuss this problem and the proceedings from this conference can be purchased from the conference site.
In any case, wind energy developers would do well to pay mind to the technological advancements aimed at reducing infrasound. I predict infrasound levels from wind farms will soon be regulated.
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