If you’re over the age of 25, you probably remember when streetlights had a warm, yellow-orange glow. That was emitted by sodium vapor lamps—the streetlight standard for many years. Recently, as ...
How dark is the night sky where you live? If you’re in an urban area, the answer will likely be “not dark at all”. The pervasiveness of artificial light – be it in the form of streetlamps, billboards, ...
It's an almost universally accepted truth that walking in well-lit areas is safer. But Aaron Chalfin, associate professor of criminology in Penn's School of Arts & Sciences; John MacDonald, ...
City planning usually prioritizes the needs of the humans living there rather than the resident plants and animals, but some cities are trying to buck the trend. While various grand, futuristic ...
For biodiversity, it’s not just about switching off street lighting, it’s about knowing when and where to turn the lights off.
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