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The International Dark-Sky Association (IDA)
The IDA explains how glare and excessive illumination prevent us from seeing the night sky, with suggestions for improving lighting at home and in communities. Includes articles on how outdoor lighting affects the environment; the reports and studies section has "The First World Atlas of the Artificial Night Sky Brightness" published in 2001, which vividly shows where lights shine brightest around the world.
http://www.darksky.org/
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