Ideas worth spreading

Why we need darkness

44,705 views | Diane Knutson • TEDxRapidCity

A century ago, the starry night sky was clearly visible -- now, songbirds mistake city skylines for the rising sun. Why is the such big problem? Former park ranger Diane Knutson explains the resounding impact light pollution has on our safety, health and environment.

A century ago, the starry night sky was clearly visible -- now, songbirds mistake city skylines for the rising sun. Why is the such big problem? Former park ranger Diane Knutson explains the resounding impact light pollution has on our safety, health and environment.

This talk was presented to a local audience at TEDxRapidCity, an independent event.

Read more about TEDx.

About the speaker

Diane Knutson

Former National Park Ranger

Diane Knutson is a former National Park Ranger and the creator of the Lights Out Movement in Rapid City.

About TEDx

TEDx was created in the spirit of TED's mission, "ideas worth spreading." It supports independent organizers who want to create a TED-like event in their own community.

Find a TEDx event near you

This talk was presented to a local audience at TEDxRapidCity, an independent event.

Read more about TEDx.