Light Pollution

Many ecologically important insects spend most of their lives in streams, but new research shines a light on how humans put them at risk.

In Idaho, a breathtaking new reserve promises to preserve the darkness — and shows how other communities can follow.

The Blue Marble is turning into a glowing globe – and in many places that’s becoming a problem for human health.

We mapped light pollution from oil and gas fields and found they outshine American cities — and that's bad news for birds.