Bronte Wells
Light pollution is a pressing issue that has gained prominence in recent times. It refers to the human-made or artificial alteration of outdoor light levels from those occurring naturally, causing a brightening of the night sky known as sky glow. This phenomenon is primarily observed in urban areas due to the excessive use of electric lights, and it has significant adverse effects on human health, wildlife behaviour, and our ability to observe the stars. The impact of light pollution is extensive, with an estimated 83% of the world's population living under light-polluted skies, and it is recognised as a form of environmental pollution with detrimental consequences.
| Characteristics | Values |
|---|---|
| Definition | The human-made alteration of outdoor light levels from those occurring naturally |
| Sources | Building exterior and interior lighting, advertising, commercial properties, offices, factories, streetlights, illuminated sporting venues, cars, boats, fireworks |
| Effects | Sleep deprivation, fatigue, headaches, stress, anxiety, other health problems, disruption to ecosystems, adverse effects on wildlife behaviour, reduced ability to observe stars and other celestial objects |
| Prevalence | 83% of the world's population live under light-polluted skies, including 99% of Europeans and Americans |
| Solutions | Adjusting light fixtures, using more appropriate light bulbs, turning off lights when not needed, legislative change, adding shielding fixtures to lighting systems |
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What You'll Learn
Light pollution's impact on human health
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It has harmful effects on streetlights, greenhouses, and satellites, among other sources. It is one of the fastest-growing and most pervasive forms of environmental pollution, affecting human health, wildlife behaviour, and our ability to observe stars and celestial objects.
The excessive or inappropriate use of outdoor artificial light can negatively impact human health. Research suggests that artificial light at night can increase the risk of obesity, depression, sleep disorders, diabetes, breast cancer, and more. It can disrupt the natural body rhythms in humans, including the circadian rhythm—the internal 24-hour clock that guides day and night activities and affects physiological processes. The production of melatonin, a hormone released in the dark, is inhibited in the presence of light. Lowered melatonin production due to increased light at night can result in sleep deprivation, fatigue, headaches, stress, anxiety, and other health issues. Furthermore, studies have found a link between reduced melatonin levels and cancer.
The American Medical Association (AMA) has recognised the health effects of artificial light, supporting efforts to control light pollution and research its potential risks. According to the AMA, white LED lamps have five times the impact on circadian sleep rhythms compared to conventional street lamps. Surveys have associated brighter residential nighttime lighting with reduced sleep duration, poor sleep quality, excessive sleepiness, impaired daytime functioning, and obesity. Additionally, there is emerging research exploring the correlation between light pollution and Alzheimer's disease.
Light pollution can also impact human health indirectly. For example, it can disturb people indoors, leading them to turn on more lights and expose themselves to additional artificial light. Furthermore, light pollution affects wildlife, causing issues such as altered migration patterns, disrupted wake-sleep habits, and habitat formation. These impacts on wildlife can indirectly affect human health, as they can disrupt ecosystems and impact food sources.
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Light pollution's effect on wildlife
Light pollution, caused by the excessive or inappropriate use of outdoor artificial light, has a detrimental impact on wildlife behaviour and ecosystems. It is a human-made alteration of outdoor light levels from those occurring naturally, and it affects the natural body rhythms of both humans and animals. Nocturnal light can confuse the circadian rhythm, the internal 24-hour clock that guides day and night activities and affects physiological processes in nearly all living organisms.
The introduction of artificial light is a drastic change to the environment of nocturnal animals, turning night into day. This can alter the breeding, feeding, and predator avoidance behaviours of many species. For example, artificial light has been shown to affect the feeding behaviours of small mammals, with mice eating less in lit areas to avoid predators. Conversely, predators of small mammals, such as foxes, are attracted to lit areas for easy prey.
Light pollution also impacts migratory birds, disrupting their normal flight activity and attracting them to circle within the cone of light, leading to exhaustion or collision with the light source. It can further extend the day for diurnal species, making them more susceptible to predators and causing early breeding.
Additionally, artificial light can act as a trap for certain insects, attracting them and leading to their death from exhaustion, heat, or predation. This can change the diversity of insect populations, with potential consequences for the ecosystem.
Overall, light pollution has far-reaching effects on the behaviour, breeding, and survival of various wildlife species, disrupting the natural balance of ecosystems.
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Sky glow
Light pollution is a pressing issue, affecting human health, wildlife behaviour, and our ability to observe the night sky. One of the most pervasive forms of light pollution is sky glow, which is the brightening of the night sky, mostly over urban areas. This is caused by the electric lights of cars, streetlamps, offices, factories, outdoor advertising, and buildings, turning night into day for people who work or play after dark.
The brightening of the night sky due to artificial light sources has a detrimental impact on astronomy and the health of humans and wildlife. The excessive light at night disrupts the natural body rhythms of humans and animals, including the production of melatonin, which is released when it is dark and inhibited when there is light present. This can lead to sleep deprivation, fatigue, headaches, stress, anxiety, and other health issues.
Furthermore, the scattered light in the atmosphere from sky glow reduces the contrast in the night sky, making it harder to observe stars and other celestial objects. This is a significant concern for astronomers, as their ability to view and study the universe is diminished.
To address the issue of sky glow, several measures can be implemented. These include using light sources of minimum intensity necessary, turning off lights when not needed, using timers and sensors, and employing full cutoff lighting fixtures that reduce the escape of light above the horizontal plane. By implementing these strategies, we can reduce the impact of sky glow and work towards preserving the natural darkness of the night sky.
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Light trespass
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It is a side effect of industrial civilization, with sources including building exterior and interior lighting, advertising, commercial properties, offices, factories, streetlights, and illuminated sporting venues. Light pollution is a global issue, with 80% of the world's population living under sky glow, and it has been shown to have harmful effects on human health, wildlife behaviour, and our ability to observe stars and other celestial objects.
To address light trespass, it is recommended to work collaboratively with neighbours to create an atmosphere that benefits the whole community. Writing a letter to express your concerns is often more effective than threatening legal action, which can create bad feelings in the neighbourhood.
Overall, light trespass is a significant concern that can have detrimental effects on both humans and wildlife, contributing to the broader issue of light pollution.
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How to reduce light pollution
Light pollution is indeed real, and it is a growing global issue. It is caused by the excessive or inappropriate use of outdoor artificial light, which has a detrimental impact on human health, wildlife behaviour, and our ability to observe the stars and other celestial bodies.
Choose the right light bulbs
LEDs and compact fluorescents (CFLs) can help reduce energy use and protect the environment, but only warm-coloured bulbs should be used. Low-pressure sodium lights are also a good option as they have low power consumption and the monochromatic light is good for insects and human sleep.
Use dimmers, motion sensors, and timers
These can help to reduce average illumination levels and save energy. Motion sensors can be particularly effective, as they ensure that lights are only fully illuminated when triggered by approaching vehicles or pedestrians.
Shield lights to minimise glare and light trespass
Outdoor lighting fixtures that shield the light source can help to prevent light pollution by minimising glare and reducing light trespass onto neighbouring properties.
Advocate for local legislation
Individuals can band together to enact local legislation to reduce light pollution. This can include supporting organisations like DarkSky International, which works to restore the nighttime environment and protect communities and wildlife from light pollution, or pushing for local lighting ordinances that promote responsible lighting practices.
Create and promote dark-sky areas
Individuals, institutions, and governments can work to create and promote dark-sky areas, which are locations that have minimal light pollution and offer a better viewing experience of the night sky.
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Frequently asked questions
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It is caused by the inefficient or unnecessary use of artificial light.
Light pollution has been shown to have adverse effects on human health, wildlife behaviour, and our ability to observe stars and other celestial objects. It can interfere with sleep cycles, disrupting the normal circadian rhythms of both humans and animals. It also reduces the visibility of the night sky, with 80% of North Americans unable to see the Milky Way galaxy.
Light pollution is most severe in highly industrialised and densely populated areas, such as North America, Europe, and Asia, and in major cities in the Middle East and North Africa, like Tehran and Cairo. According to the World Atlas of Artificial Night Sky Brightness, 80% of the world's population lives under sky glow, with 99% of Americans and Europeans unable to experience a natural night.
Reducing light pollution can be as simple as turning off lights when they are not needed or eliminating them from certain places. Other solutions include adjusting light fixtures, using more appropriate light bulbs, and advocating for legislative change to implement better lighting standards.
