Glowing, Glowing, Gone: What We Lose When We Turn On the Lights | Amy Oliver | TEDxUofA

Summary of YouTube Video: Light Pollution and Its Impact

Key Concepts:

• Light pollution: Human-made light that disrupts natural darkness.
• Bioluminescence: The production and emission of light by living organisms.
• Southwest synchronous fireflies (Faus Nui): Fireflies that blink in unison for mating.
• Sky glow (Light domes): Blankets of light that obstruct the view of the night sky.
• Nictinasty: The sleep-like behavior of plants, involving the closing of petals and leaves.
• Circadian rhythms: Internal biological clocks that regulate various bodily processes.
• Pollinators: Animals that transfer pollen from one plant to another, enabling fertilization.
• Outdoor lighting codes: Regulations that govern the use of outdoor lighting.
• Stars Program: Smithsonian program to provide telescopes and astronomy curriculum to rural/tribal schools.

Fireflies and the Impact of Light Pollution on Mating Rituals

The video begins by highlighting the mating rituals of Southwest synchronous fireflies (Faus Nui), where males blink in unison to attract females. Artificial light pollution is disrupting this process, reducing the chances of successful mating. The speaker emphasizes that these fireflies have specific standards for mating, requiring a sufficient number of males to participate in the synchronized blinking display. Light pollution interferes with their ability to find mates, impacting their reproduction rates. Fireflies are also significant pollinators and natural pest control agents, feeding on slugs and snails.

Example: The speaker mentions witnessing the dance of the Southwest synchronous firefly in July 2023 and discovering that blinking fireflies exist west of the Rocky Mountains, contrary to some scientific claims.

Project Gloworm: The speaker launched "Project Gloworm" to study bioluminescence in the Santa Rita Mountains, discovering two Genera of glowworms living above 8,000 feet. Evidence for blinking fireflies at these heights was also found.

Light Pollution's Effects on Observatories and Astronomical Viewing

Light pollution creates "light domes" or "sky glow," which obstructs the view of the night sky, making it difficult to see dim stars and celestial objects.

Example: Residents of rural Amado, Arizona, have breathtaking views of the night sky, but those in downtown Tucson, just 45 miles away, are deprived of this. Globally, more than 83% of the population lives under light-polluted skies, and over a third will never see the Milky Way. The speaker shares their experience working at observatories like Mount Lemon Sky Center and Whipple Observatory, emphasizing the challenges faced by astronomers due to light pollution.

Impact on Plants and Ecosystems

Light pollution also affects plants and their ecosystems.

• Cacti and Agave: These plants rely on darkness to collect carbon dioxide for photosynthesis. Light pollution disrupts this process, negatively impacting their nutrition and health.
• Nictinasty: Plants like Mimosa, Acacia, tulips, poppies, and Globe Mallow exhibit nictinasty, closing their petals and leaves at night, a behavior disrupted by light pollution. Bumblebees and other species often find refuge in these closed flowers at night. Light pollution "shuts down these bee hotels".
• Queen of the Night: This plant opens its blossoms in darkness for pollination by nocturnal bats. Light pollution can trick the plant into not opening its blossoms, impacting the animals and ecosystem that depend on it. Orioles eat her seeds and disperse them under cover of darkness.

Personal Reflection and Call to Action

The speaker reflects on the fading memory of the night skies from their childhood (39 years old) and expresses concern about future generations being unable to experience the beauty of a dark, star-filled sky and the wonder of fireflies.

Stars Program: The speaker leads the "Stars" program at the Smithsonian, which aims to provide telescopes and astronomy curriculum to every rural and tribal Nation school across America.

Solutions to Reduce Light Pollution

The speaker emphasizes that light pollution is a global challenge where individual actions can make a significant impact.

Actionable Steps:

1. Replace bright white LEDs with amber-colored ones (2700 Kelvin or below): Available at grocery and hardware stores.
2. Use fully shielded light fixtures: Direct light downward, reducing upward light pollution by up to 75%.
3. Support outdoor lighting codes: Encourage the development of codes that guide the use of outdoor light in local ecosystems.
4. Turn out the lights: Allow darkness to reclaim its rightful place.

Notable Quote: "Always, always keep looking up."

Synthesis/Conclusion

Light pollution is a pervasive issue with far-reaching consequences for fireflies, astronomical observation, plants, and ecosystems. Simple, actionable steps can be taken by individuals and communities to reduce light pollution and preserve the beauty and ecological integrity of the night sky for future generations.