# Why we need darkness

- Institution: TED
- Department: TEDxRapidCity
- Speaker: Diane Knutson
- Year: 2016
- Level: For everyone
- Language: English
- Subjects: Medicine and health, Earth and environment
- Source: [TED](https://www.ted.com/talks/diane_knutson_why_we_need_darkness)
- Licence: [CC BY-NC-ND 4.0](https://creativecommons.org/licenses/by-nc-nd/4.0/) (Non-commercial use only, and no changed versions.)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

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.

## Lectures

1. [Why we need darkness](https://invisiblenetwork.ai/learn/ted/diane_knutson_why_we_need_darkness/08f26cb78ee8), 12 min (TED's player)