Helena Joyce
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally, caused by artificial light shining outward and upward into the sky. It is a side effect of industrialization, with sources including building exterior and interior lighting, advertising, commercial properties, offices, factories, streetlights, and illuminated sporting venues. Light pollution has been linked to adverse effects on human and wildlife health, including sleep deprivation, fatigue, headaches, stress, anxiety, and cancer. It also disrupts the natural patterns of darkness, compromising the view of the night sky and affecting the feeding behavior of nocturnal animals. As light pollution continues to increase globally, there is a growing movement to address this issue through legislation, improved lighting fixtures, and energy conservation.
| Characteristics | Values |
|---|---|
| Definition | The presence of any unwanted, inappropriate, or excessive artificial lighting |
| Types | Glare, Clutter, Light trespass, Skyglow |
| Causes | Industrialized nations, Industrial civilization, Bad lighting design, Inefficient lighting |
| Effects | Health issues (cancer, sleep deprivation, fatigue, headaches, stress, anxiety), Economic impact, Environmental impact, Impact on wildlife |
| Solutions | Using timers and sensors, Using minimum light intensity, Improving lighting fixtures, Using high-efficiency light sources, Shielding lights, Dimming lights |
| Organizations | International Dark-Sky Association, Institution of Lighting Engineers in the United Kingdom |
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What You'll Learn
Light pollution is a human-made alteration of outdoor light levels
Artificial light can disrupt the natural day-night cycle, affecting human health and well-being. Studies have linked exposure to artificial light at night with health issues such as sleep deprivation, fatigue, headaches, stress, and anxiety. More concerning is the potential connection between light pollution and cancer. Research suggests a correlation between night shift work and increased cancer risks, particularly breast cancer and colorectal cancer.
Light pollution also impacts wildlife and their natural behaviours. For example, the feeding behaviour of bats and the migration, reproduction, hunting, and feeding patterns of other animals are altered by artificial light. Sea turtle hatchlings, instinctively attracted to the brightest light, become disoriented by coastal city lights, leading to dehydration, predation, and a failure to reach the safety of the ocean.
The sources of light pollution are diverse and include streetlights, building exterior and interior lighting, advertising, commercial properties, offices, factories, and illuminated sporting venues. The excessive brightness of lights, known as glare, can cause visual discomfort and even interfere with driving. Light trespass, another form of light pollution, occurs when artificial light spills into areas where it is not wanted, such as neighbouring properties or natural spaces.
Addressing light pollution requires a combination of individual, community, and legislative efforts. Individuals can contribute by using outdoor lighting only when necessary, directing light downwards, and using timers or sensors to turn off lights when not in use. Communities can advocate for local lighting ordinances, and manufacturers can design and produce high-efficiency light sources that reduce light pollution while saving energy. Additionally, organizations like the International Dark-Sky Association work to preserve the natural night sky and educate the public about light pollution reduction.
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It is a side effect of industrial civilisation
Light pollution is a significant problem caused primarily by industrialised nations. It is a side effect of industrial civilisation. The human-made alteration of outdoor light levels from those occurring naturally is a defining feature of light pollution. This occurs through the overuse and misuse of artificial light, particularly at night. Artificial light has benefited society by extending the productive day and providing more time for recreational activities. However, when artificial lighting becomes inefficient, annoying, and unnecessary, it becomes a form of pollution.
The sources of light pollution include building exterior and interior lighting, advertising, commercial properties, offices, factories, streetlights, and illuminated sporting venues. Common examples of light pollution include street lamps, parking lot lights, shopping mall lights, exterior lights on homes and businesses, and neon signs. Light pollution is not limited to urban areas, as the glow from cities has been observed at distances over 200 miles from national parks.
The effects of light pollution are magnified at night due to the contrast with the sky's darkness. Skyglow, one of the three types of light pollution, refers to the brightening of the night sky caused by human-made light scattered in the atmosphere. This obscures our view of the natural night sky and can be observed from great distances.
Light pollution has harmful consequences for both humans and wildlife. Nocturnal light can disrupt sleep and confuse the circadian rhythm, leading to health issues such as sleep deprivation, fatigue, headaches, stress, and anxiety. Additionally, research has indicated a potential link between reduced melatonin levels due to light pollution and an increased risk of certain cancers.
Light pollution also impacts wildlife behaviour and populations. For example, artificial light alters the feeding behaviour of bats and contributes to the decline in populations of North American moths. Sea turtle hatchlings become disoriented by bright city lights, leading them away from the ocean and towards potential dangers.
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It has harmful effects on human health
Light pollution is the presence of any unwanted, inappropriate, or excessive artificial lighting. It is a major side effect of urbanisation, and about 83% of the world's population lives under light-polluted skies. Light pollution has been linked to several harmful effects on human health.
Firstly, light pollution can disrupt the natural circadian rhythm of humans. The internal 24-hour clock guides day and night activities and affects physiological processes, including the production of the hormone melatonin, which is released in the absence of light and inhibited when light is present. Nocturnal light exposure thus lowers melatonin production, leading to sleep deprivation, fatigue, headaches, stress, and anxiety.
Secondly, light pollution has been associated with an increased risk of certain cancers. Studies have found a correlation between outdoor artificial light at night and breast cancer, with nurses working rotating night shifts in their young adulthood having a higher risk of developing the disease. Furthermore, recent research has indicated a potential link between light pollution and Alzheimer's disease, although further studies are needed to confirm this relationship.
Thirdly, light pollution can cause visual discomfort and even impair vision. Glare, one form of light pollution, can cause discomfort when driving or engaging in other activities that require clear vision. Additionally, the excessive brightness from light pollution can diminish our ability to see potential dangers at night, especially for older individuals with aging eyes.
Lastly, light pollution may contribute to mental health issues such as depression and obesity. Brighter residential nighttime lighting has been associated with reduced sleep times, dissatisfaction with sleep quality, excessive sleepiness, and impaired daytime functioning, all of which can have negative consequences on overall health and well-being.
While light pollution has various harmful effects on human health, it is important to note that research in this area is ongoing, and more studies are needed to fully understand the complex relationships between light pollution and its health impacts.
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It has harmful effects on wildlife
Light pollution is the presence of any unwanted, inappropriate, or excessive artificial lighting. It has been estimated that 83% of the world's population lives under light-polluted skies, and this number is only expected to increase. This form of pollution has harmful effects on wildlife, including:
Disruption of Natural Body Rhythms
Artificial light can disrupt the natural body rhythms of animals, including their circadian rhythm, which guides day and night activities and affects physiological processes. For example, nocturnal animals that are active at night may have their sleep disrupted, leading to potential health issues.
Alteration of Nocturnal Ecology
The introduction of artificial light represents a drastic change to the environment of nocturnal animals. Predators may use light to hunt, while prey species use darkness as cover. Light pollution can also impact wetland habitats, disrupting the nocturnal breeding rituals of amphibians such as frogs and toads and reducing their populations.
Attraction and Repulsion of Organisms
Light pollution can attract some organisms, such as moths, frogs, and sea turtles, making them more susceptible to predation or exhaustion. It can also repel other organisms, effectively creating a form of habitat loss.
Alteration of Nesting and Reproductive Behaviour
Artificial light has been found to alter nesting behaviour and possibly calling in amphibians, affecting their breeding success. For example, some frogs gather at lights to forage, making them more vulnerable to dehydration and predators.
Barrier Creation and Habitat Fragmentation
Artificial light can act as a barrier for some species, such as cougars, which will not cross brightly lit areas. This can lead to habitat fragmentation and further disrupt ecological balance.
Overall, light pollution has far-reaching consequences for wildlife, and addressing this issue is crucial for maintaining healthy ecosystems and preserving biodiversity.
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It can be reduced by changing societal habits
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It is a significant problem, with 83% of the world's population living under light-polluted skies. It is caused by artificial light sources such as street lamps, building lights, advertising, commercial properties, offices, factories, streetlights, and illuminated sporting venues. The effects of light pollution are magnified during the night, disrupting the natural day/night cycle and causing several problems for humans, wildlife, and the environment.
Reducing Light Pollution by Changing Societal Habits
Light pollution can be reduced by changing societal habits and behaviours. Firstly, individuals can be mindful of their energy consumption and use lighting more efficiently. This includes turning off lights when they are not needed and using timers or occupancy sensors to automate this process. Properly shielding lights and directing light downwards can also reduce light pollution by minimising unwanted light spill into other areas.
In addition to individual actions, collective efforts are crucial. Communities can advocate for local legislation to regulate outdoor lighting and reduce light pollution. Manufacturers can play a role by designing and producing high-efficiency light sources that save energy and minimise light pollution. For example, the use of Aircraft Detection Lighting Systems (ADLSs) allows wind turbines to turn on lights only when aircraft are detected, reducing unnecessary illumination.
Societal habits can also be changed through education and awareness campaigns. Organisations such as the International Dark Sky Association (IDA) educate the public about light pollution and work with communities to reduce light emissions. By spreading awareness, more people can take action to reduce light pollution, such as by closing window coverings at night to keep light inside their homes.
By combining individual actions with collective efforts and adopting more efficient lighting practices, society can significantly reduce light pollution and its adverse effects on human health, wildlife, and the environment.
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Frequently asked questions
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It is the presence of any unwanted, inappropriate, or excessive artificial lighting.
Light pollution has harmful effects on humans, wildlife, and the environment. It has been linked to health issues such as sleep deprivation, fatigue, headaches, stress, and anxiety as well as an increased risk of certain cancers. Light pollution also disrupts the natural behaviours of nocturnal animals, leading to population declines.
Light pollution is a growing global issue, with 80-83% of the world's population living under light-polluted skies. It is a waste of resources and money, with the International Dark-Sky Association estimating that one-third of all lighting is wasted at an annual cost of $2.2 billion. Additionally, light pollution obscures our view of the natural night sky and disrupts our natural day/night cycle.
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