4 septiembre 2015
Nearly 90 percent of visitors to a major national park highly valued the night sky and wanted the National Park Service to take steps to reduce light pollution. The study also established a threshold below which visitors found light pollution of the night skies unacceptable, a standard park staff can manage toward using a variety of strategies in and out of the park.
http://www.sciencedaily.com/releases/2015/09/150904105317.htm
