Learn · TED

Talk12 min

Why we need darkness

Diane Knutson · TED

Watch At TED

About

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.

The talk

  1. Why we need darkness 12 min · TED's player

Credits and licence

Institution
TED
Department
TEDxRapidCity
Speaker
Diane Knutson
Year
2016
Level
For everyone
Language
English
Subjects
Medicine and health, Earth and environment
Source
TED
Licence
CC BY-NC-ND 4.0, as TED states it. Non-commercial use only, and no changed versions. TED's terms
Attribution
TED Talks are licensed by TED under Creative Commons BY-NC-ND 4.0 International and are shown here in TED's own player, as TED's usage policy asks.
Who can watch
TED gives no rating. Invisible Network shows it to Teens profiles and older, judged from what the source says about it. How courses are placed