On Light Pollution

Tying in with Hedgemaker's post…

Did you know? Two–thirds of Americans cannot see the Milky Way from their backyard, and 99% of the population live in an area that scientists consider light polluted. The rate at which light pollution is increasing will leave almost no dark skies in the contiguous US by 2025.

http://www2.nature.nps.gov/air/lightscapes/