|Image from NASA's The Gateway to Astronaut Photography of Earth|
Here is a labeled version of the photo:
International Dark-Sky Association, the Royal Astronomical Society of Canada is very active about certifying Dark-Sky Sites.
Both organizations realize the importance of preserving and sharing the night sky. By creating programs that let city-dwellers experience the beauty of the night sky they can hopefully return to their home and affect positive change where they live.
Don't forget the IDA is in the Pepsi Refresh competition. You can vote each day in this month (December, 2011) to help the IDA create observing sites that will promote astronomy and dark-sky education.