This one sums it all up very nicely:
http://www.mnn.com/lifestyle/responsible-living/stories/why-dark-skies-matter?utm_source=CNN&utm_medium=Desktop&utm_campaign=Oct2016
http://www.mnn.com/lifestyle/responsible-living/stories/why-dark-skies-matter?utm_source=CNN&utm_medium=Desktop&utm_campaign=Oct2016