Light pollution threatens to make stars invisible within two decades.

Scientists warn that increasing light pollution caused by LED lighting and other forms of lighting is rapidly worsening and may lead to a complete disappearance of the starry night sky in 20 years. The German Centre for Geosciences suggests that altering lighting can significantly improve things by concealing outside lights and directing them downward, lowering light intensity, and making sure that lights are primarily blue-white with some red and orange components. Light pollution also affects sea turtles, migratory birds, and serves as a cover for criminal activity and other human dangers.