Nothing beats a beautifully clear, starry night. But in many places around the world, light pollution is hiding the twinkling stars from our view. Light pollution comes from artificial outdoor lights like street lamps, stadium lights, and porch lights. Nearly three-quarters of city dwellers have never seen a pristine dark sky and many don’t know what they’re missing. But light pollution doesn’t only affect humans — it can also do widespread ecological damage. Too much light can disrupt nocturnal animals, confuse migratory animals, and have harmful physio-logical effects on the rhythm of life.