Light Pollution 101 | National Geographic

Ever since the light bulb’s invention 150 years ago, artificial light has illuminated homes, streets, and skies -- but with some unintended consequences. Learn about the major types of light pollution, their impact on human health, and how the worldwide glow from artificial light may continue to grow. ➡ Subscribe: #NationalGeographic #LightPollution #Educational About National Geographic: National Geographic is the world’s premium destination for science, exploration, and adv