This Symposium, Light at Night: A Glowing Hazard, brings together leading experts for an illuminating discussion on how light pollution works and how we can reduce it.

Artificial light at night dilutes our view of the night sky, swallowing stars and planets alike. 80% of the world lives under light-polluted skies, and the Milky Way is hidden from more than one third of humanity. The damaging effects of light pollution go far beyond our loss of beauty; artificial light at night negatively affects living beings across the spectrum of biodiversity, humans included. The circadian rhythms of living beings evolved over millions of years of consistent day and night cycles. When our circadian rhythms are disrupted, it can lead to severe health consequences, such as hormone disruption and increased risk of cancer. Artificial light increases the risk of bird strikes, and the sky glow from cities can lead migratory birds astray. Cumulatively, artificial light at night can devastate ecosystems.

Fortunately, there are straightforward solutions (known as Dark Sky Policies) to mitigate light pollution, both at an individual and societal level! We can avoid unnecessary pollution by taking actions such as using bulbs with warmer (redder) color temperatures and using shielded light fixtures to prevent light from shining upwards. The use of shades, motion-sensors, and setbacks from sensitive habitat areas can also have a real positive impact! And as individuals we should never underestimate our collective power to influence our government to implement Dark Sky policies!

After watching the webinar, you should have a solid understanding of the light pollution and what you can do about it! Most of all, we hope you come away with the conviction that all living beings deserve to live under a clear, starry night sky!

San Jose at night, from Mt. Hamilton; Image: Keith Wandry

Individual Segment Videos | Speaker Bios

Questions? Please contact Rani Fischer at ranif@scvas.org

Thank you to our supporters!

​