A panel of experts who were appointed to work toward noise level guidelines for wind turbines in Michigan had their work discarded when state bureaucrats didn't like what the panel was coming up with and made up their own rules instead. As a result, there is now no specific state recommended decibel level limit for wind turbines. This means wind turbines can operate at 55 dBA (decibels adjusted to reflect the ear's response to sound), which is the standard Michigan had followed for at least two years. The panel was promoting reducing that level to 40 dBA...