Emerald Valley Almanac

Light pollution

Light pollution is excessive, inappropriate, intrusive artificial light. Different types of light pollution have been identified, including: Glare (think car headlights); skyglow – the result all the light that escapes upward, causing the night sky to appear light; light trespass – light falling where it is not wanted; and light clutter  (Las Vegas is the perfect example). The amount of artificial light covering the earth is increasing by 2% a year. Although the newer LED lighting is more energy-efficient, it also emits more light than older technology, increasing the amount of unwanted light.