Darkness

Light Pollution

According to the International Dark-Sky Association (IDA), the term light pollution refers to “any adverse effect of artificial light, including sky glow, glare, light trespass, light clutter, decreased visibility at night, and energy waste.” The IDA further states that light pollution “wastes energy, affects astronomers and scientists, disrupts global wildlife and ecological balance, and has been linked to negative consequences in human health.” - https://kids.niehs.nih.gov/topics/natural-world/wildlife/ecology/lighting/index.htm 

It is estimated that billions of dollars are wasted each year throughout the world on light that illuminates nothing on the ground, but instead points straight up.

Bright lights near someone’s front door create an illusion of safety, but not true safety, according to Bogard. That’s because the glare shining into our eyes makes it difficult to impossible to see what is hiding in the deep shadows cast by the light. Proper lighting directs illumination toward the ground, away from the sky and out of the eyes of those nearby.

Keeping communities safe can be made much easier and cheaper by replacing constant lighting with motion lights. This simple change improves safety because it makes it simple for patrols to see if a person or animal is present or not simply by the light sensors activating lights in the area. - https://earthsky.org/astronomy-essentials/paul-bogard-on-why-we-need-darkness/ 

The Importance of Darkness

This 55:39 minute documentary explains the effects of light pollution on humans

Darkness promotes human and ecosystem health. Our own circadian rhythms rely on periods of light and dark to help us sleep and produce important chemicals like vitamin D which promotes healthy bones and immune systems. Melatonin production, which is dark dependent, is suppressed when the dark is interrupted at night. “Melatonin is involved in circadian rhythm regulation, sleep, hormonal expression of darkness, seasonal reproduction, retinal physiology, antioxidant free-radical scavenging, cardiovascular regulation, immune activity, cancer control, and lipid and glucose metabolism. It is also a new member of an expanding group of regulatory factors that control cell proliferation and loss and is the only known chronobiotic hormonal regulator of neoplastic cell growth”. [Source]. Artificial light is linked to diabetes, depression, failure at school, and difficulties in concentrating. Some studies indicate a link between artificial light and obesity as well.

More than 60% of invertebrates and 30% of vertebrates are nocturnal, having evolved to find food and mates in uninterrupted darkness.

Just to name a few of the species who need darkness to survive:

All species of bats

Bats eat insects like mosquitoes

Badgers

Fireflies

Fireflies are going extinct all around the world thanks to habitat destruction, harmful gardening/farming practices, and light pollution.

Moths

Moths are important pollinators

Glowworms

Birds

450 species of birds use the moon and stars to migrate 

Turtles

80% of Marsupials

Most Rodents

Most Small Carnivores

20% of Primates

Amphibians

Amphibians also also great consumers of insects like mosquitoes

Wildlife corridors can be compromised by even a single light and so prevent animals from moving across the landscapes.

Scientific evidence shows that artificial light at night can have deadly effects on many species including turtles, amphibians, birds, mammals, insects and plants. Many insects are drawn to light, but artificial lights can create a fatal attraction. Declining insect populations negatively impact all species that rely on insects for food or pollination.

According to research scientist Christopher Kyba, for nocturnal animals, “the introduction of artificial light probably represents the most drastic change human beings have made to their environment.”

“Predators use light to hunt, and prey species use darkness as cover,” Kyba explains “Near cities, cloudy skies are now hundreds, or even thousands of times brighter than they were 200 years ago. We are only beginning to learn what a drastic effect this has had on nocturnal ecology.”

Every year millions of birds die colliding with needlessly illuminated buildings and towers. Migratory birds depend on cues from properly timed seasonal schedules. Artificial lights can cause them to migrate too early or too late and miss ideal climate conditions for nesting, foraging and other behaviors.

Solutions

Make sure that outdoor lighting used colors that interfere less with wildlife such as lights with a red or yellow tint. Light orientation/placement is important too. Shielded lights that face down, whether on billboards or meant for human safety. Other features like solar powered motion detectors can help prevent energy waste and unneeded light pollution, but may startle wild animals if they accidentally trigger the motion detector.

Contribute to Lights Out

Turn off lights not needed - Consider if late night activity is needed. Companies can save money, reduce ecological impact, and improve employee health simply by eliminating unnecessary night shifts.

Use wavelengths that do not affect wildlife or attract insects (yellow)

Keep lights away from wildlife habitat, especially endangered

Extinguish pot and flood-lights

Substitute strobe lighting wherever possible

Reduce atrium lighting wherever possible

Turn off interior lighting especially on higher stories

Curtains and blinds can reduce light pollution, while increasing privacy and insulation against hot and cold conditions. These solutions all have the added benefit of reducing deadly bird/window collisions.

Frosted windows can reduce cooling costs inside while helping to reduce light pollution outside. Frosting and decals can reduce deadly bird/window collisions.

Down-shield exterior lighting to eliminate horizontal glare and all light directed upward

Install automatic motion sensors and controls wherever possible

Reduce, turn off, eliminate, or use alternatives to decorative/festive lighting - Decorative lighting can be put on timers so that they only function when people are expected to be around to enjoy them. They could also be linked with motion sensors. Timers can reduce their impact, by having the lights only active during times of high traffic, then turning off automatically between 11pm and 6 am when few if any people may be around to enjoy them. Electric festival decorations such as Christmas lights are a very new invention with high environmental cost, and poor recycling infrastructure, (if any in most places) exists to help deal with the waste they produce. Non-electric decorations such as garlands, bunting, or other similar, reusable decorations could replace lights entirely.

Plant Bushes near light sources - these as well as carefully placed trees and vines can help reduce light pollution, noise pollution, increase habitat space, and encourage privacy. Some species can even provide food, medicine, and species with thorns or prickly leaves can provide extra security.

Turn lights away from aquatic habitats - lights from docks and communities can trick baby turtles and other endangered species into dangerous areas.

Go to sleep when it's dark - by doing this, we not only protect our own health, but reduce our own needed for light use, both saving resources, and making us better neighbors.

Reduce brightness of vehicle lights/don't buy vehicles with blindingly bright headlights - not only do these endanger other road users who become temporarily blinded by these lights while driving. Bright headlights increase the chance of animal collisions since nocturnal animals become suddenly blinded and disoriented, hence the phrase "dear in headlights".


Re-lamping communities to change roadway and walkway lamps to lower energy LEDs and to redirect the light beams only where needed can have a number of benefits:

• Reduce CO2 emissions

• Reduce waste: Communities will throw away less bulbs since LEDs last longer

• Eliminate mercury: Use of LEDs will eliminate any mercury entering the environment from streetlights

When converting to new lighting assess quality and quantity of light needed, avoiding over-lighting with newer, brighter technology. Remember that "More does not always mean better!"

Stadiums and other buildings/organizations that use flood lights, or shoot lasers into the sky can disorient migratory birds, causing them to have serious accidents or get lost. They also cause enough pollution so that surrounding communities are unable to enjoy basic natural resources like darkness (which helps us get enough sleep). Light pollution also costs us the ability to see stars, an important part of our heritage.

Since other people's lighting isn't generally something we can control, consider joining the Lights Out initiatives that are becoming more popular as awareness about this problem grows. If there are none in your area, please consider starting one. Every voice can help make a difference! - https://www.audubon.org/lights-out-program

Remember that if you reach out to neighbors, local businesses, schools, and politicians that a polite tone and sticking with facts can go a long way in creating healthy, respectful relationships that will further help promote collaboration. It can be helpful to brush up on our communication techniques. One such technique can be to point out the improved energy/money savings, improved security provided by the addition of technology such as non-blinding lights and motion sensors. People are also more likely to feel invested in eco-friendly changes when they understand that it is part of a group effort.

Avoid fireworks

Fireworks not only stress out wildlife and disrupt their natural behaviors. Fireworks terrify pets, causing more run-away/lost pet situations around yearly firework seasons/events. People with PTSD and sensory processing disorders such as people with autism can also suffer severe distress from the loud noises and sudden, bright lights. Alternatives can save resources including money, and reduce pollution caused by exploded firework each year that then wash into waterways. Some examples include:

• Light shows projected onto buildings

• Shadow performances

• Cultural dances, costumes, and decorations

• Choreographed drone displays.

Examples of Success!

"April 12, 2021 -- Mayor Sylvester Turner has proclaimed April 19 - May 7, 2021 “Lights Out Nights” in Houston, encouraging all businesses, residents, and building managers to turn off non-essential exterior lighting from 11 p.m. to 6 a.m. during the period of peak migration for birds through Texas."

"An estimated two billion birds migrate through the state of Texas each year, around one quarter to one-third of all birds migrating throughout the United States. Most North American migratory birds travel at night, and lights on buildings can attract and disorient these birds, resulting in fatal collisions with buildings."

"Houston and the Upper Texas Coast play a key role on the Central Flyway, an important migratory path for birds. Birds that move along and across the Gulf of Mexico depend on safe passage through the Houston-Galveston area. In a 2019 study, though, Houston was found to be the second most dangerous city in the country for migrating birds in terms of exposure to light pollution due to the intersection of its high light output and the vast numbers of migratory birds that pass over the city."

The Mayor's Office Press Release also made sure to mention the organizations including people like you who helped bring this program into action:

"The Lights Out Texas initiative is possible thanks to a partnership led by the Cornell Lab of Ornithology, Houston Audubon, Texas Conservation Alliance, Dallas Zoo, the Perot Museum of Nature and Science, Texan by Nature, and many others."

The Dallas Zoo has two wildlife programs. One in which they "partner with conservation organizations around the world, to directly support efforts to save animals and ecosystems from extinction." The other, they offer conservation expeditions ranging from saving sea turtles and restoring sea turtle habitat on South Padre Island in South Padre, to saving bats in Bracken Cave.

Thanks to the Earth Hour campaign's 13th edition had "The Sydney Opera House and the Harbour Bridge... plunged into darkness for an hour Saturday to raise awareness about climate change and its impact on the planet's vanishing biodiversity." The same article notes that "Paris's Eiffel Tower, New York's Empire State Building, Dubai's Burj Khalifa and the Acropolis in Athens are among the 24 global landmarks that will take part in Earth Hour."

Resources

Europe

If there are none near you, why not start one yourself? Sometimes all it takes is a friendly e-mail or call to the right person!

Practical Outreach

Dark Sky Reserves & Parks

International

Africa

Namibia

Europe

France

Germany

Ireland

Italy

UK

England

Wales

North America

Canada

Québec

USA

Idaho

New Mexico

Oceana

Australia

New Zealand

Niue

The entire island nation is a dark sky nation.

Organizations

Click the Dark Sky Initiatives button to learn about organizations around the world who are working towards healthier skies and dark spaces.

Maps

North America

USA

Texas