The damage done by chemical and air pollution is no mystery: Plastic has seeped into virtually all of the worlds ecosystems no matter how difficult they are to reach. Air pollution meanwhile, is estimated to cause some 6.5 million deaths per year worldwide. But there is one form of pollution with lesser-known dangers: Light pollution. My guest today Johan Eklof published a manifesto exploring the importance of living in darkness to better preserve life. He joined us on Perspective.