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Effects of light pollution

Photo by Mike Lewinski via Flickr (CC 2.0)

Light pollution negatively affects:

Wildlife and ecosystems

A mountain lion at night, with the city lights of Los Angeles in the background.

Energy and climate

Human health

Photos showing street lighting trespassing into people’s homes, a woman having trouble sleeping

Crime and safety

A man at night, nearly hidden in the glare of a park light.

Night sky heritage