Health Benefits of Dark Sky Cities
http://shamvswham.blogspot.com/2009/02/artificial-nighttime-lighting-and.html

"Some people have an intense desire to live in an area with a very dark 
sky at night. Many of my friends and neighbors feel this way, so they've 
chosen places like Sedona, Flagstaff or Tucson, Arizona in which to 
live. Now, it seems as if this need to live in a "dark sky city" may 
have a basis in health.

In Israel and Connecticut, a new study has been published which 
originated at the University of Haifa. This study discovered that 
worldwide, countries with the highest levels of artificial light at 
night also have the highest rates of prostate cancer. The new study 
concludes that countries in which nighttime artificial lighting is used 
more intensively tend to have a higher risk of prostate cancer in men. 
This joins a previous finding that was published in Chronobiology 
International in 2008, in which exposure to artificial lighting at night 
increases the incidence of breast cancer in women."

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Steve