Here's why from later down:
“Light-pollution activists and governments have been very focused on street lighting, and that makes sense because it’s probably the biggest single source and the government has direct control over it,” Kyba said. “But my worry is that most of the growth in light is coming from other applications. If we want to reduce the environmental impact of outdoor lighting, it’s not good enough to change to LED streetlights and then stop. We need to think critically about all the different types of light sources there are.”
