Bronte Wells
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, such as building exterior and interior lighting, advertising, commercial properties, offices, factories, streetlights, and illuminated sporting venues. 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 is a global issue, with 83% of the world's people living under light-polluted skies.
| Characteristics | Values |
|---|---|
| Definition | The presence of any unwanted, inappropriate, or excessive artificial lighting |
| Sources | Building exterior and interior lighting, advertising, commercial properties, offices, factories, streetlights, illuminated sporting venues |
| Effects | Adversely affects astronomers, casual observers of the night sky, birds, other animals, human health, and ecosystems |
| Specific categories | Light trespass, over-illumination, glare, light clutter, and skyglow |
| Solutions | Adjusting light fixtures, using more appropriate light bulbs, and educating the public to push for legislative change |
| Global prevalence | 83% of the world's population lives under light-polluted skies, including 99% of Europeans and Americans |
| Magnification | Effects are magnified during the night due to the contrast of the sky's darkness |
| Connection to other types of pollution | Light pollution is connected to air pollution as it is generated by electricity, which is produced by the combustion of fossil fuels |
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What You'll Learn
- Light pollution is a human-made alteration of outdoor light levels
- It is caused by inefficient or unnecessary use of artificial light
- Light pollution competes with starlight and obscures our view of the night sky
- It has adverse health effects on humans and wildlife
- Light trespass occurs when unwanted light enters one's property
Light pollution is a human-made alteration of outdoor light levels
The presence of excessive or inappropriate artificial lighting can negatively impact the natural environment. For example, it can interfere with the health of humans and wildlife, as well as our ability to observe stars and other celestial objects. Light pollution competes with starlight in the night sky, reducing visibility and obscuring our view of the natural night sky. This phenomenon is known as "skyglow," and it is caused by the scattering of artificial light in the atmosphere.
The effects of light pollution are not limited to the night sky. It can also have ecological consequences, such as disrupting ecosystems and altering the day/night patterns of both humans and wildlife. Studies have shown that it can impact human and animal circadian rhythms, melatonin regulation, sleep patterns, and overall health. Light pollution has been linked to various health issues, including sleep deprivation, fatigue, headaches, stress, anxiety, and potentially more severe problems such as cancer.
Addressing light pollution is crucial, and there are steps that can be taken to mitigate its impact. These include adjusting light fixtures, using more appropriate light bulbs, and educating the public to push for legislative change. Additionally, individuals can take responsibility by turning off lights at night, using shielded light fixtures, and limiting light leakage from their homes.
Light pollution is a global issue that has increased significantly over the years, affecting highly industrialized and densely populated areas. It is important to recognize its negative consequences and take collective action to reduce its impact on the environment and living beings.
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It is caused by inefficient or unnecessary use of artificial light
Light pollution is a pressing issue that has affected 83% of the world's population and 99% of Americans and Europeans. It is caused by the inefficient or unnecessary use of artificial light, which has altered outdoor light levels from those occurring naturally. This phenomenon is a side effect of industrial civilization, with sources ranging from building exterior and interior lighting to advertising, commercial properties, offices, factories, streetlights, and illuminated sporting venues.
The excessive use of artificial light has led to a brightened night sky, often referred to as "sky glow." This effect is caused by electric lights from cars, streetlamps, and buildings, which turn night into day for those living and working in urban areas. The glow from cities has been observed at distances over 200 miles from national parks, impacting the natural darkness and visibility of stars.
Light pollution has significant adverse effects on both human health and wildlife. In humans, it can interfere with the production of melatonin, a hormone released in darkness that aids in sleep regulation. Reduced melatonin levels have been linked to sleep deprivation, fatigue, headaches, stress, anxiety, and even potential cancer risks. Additionally, the excessive light can disrupt human circadian rhythms, affecting the internal 24-hour clock that guides day and night activities.
Wildlife is also greatly impacted by light pollution, which can confuse their natural day and night patterns. Certain organisms may be repelled from their natural habitats or attracted to unsafe areas, leading to a higher risk of predation or other dangers. Furthermore, light pollution can alter the behavior of wildlife, impacting their reproductive cycles and natural rhythms.
Addressing light pollution involves both individual actions and legislative changes. Individuals can contribute by turning off unnecessary lights at night, using shielded and light-efficient fixtures, and limiting light leakage from their homes. At the same time, public education and advocacy for legislative change can help establish codes and statutes to reduce light pollution and protect the health of humans, wildlife, and the environment.
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Light pollution competes with starlight and obscures our view of the night sky
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, such as building exterior and interior lighting, advertising, commercial properties, offices, factories, streetlights, and illuminated sporting venues. This type of pollution is not limited to urban environments, but it tends to be most acute in these areas.
The excessive use of artificial light at night can negatively impact human health, wildlife behaviour, and our ability to observe stars and other celestial objects. Studies have shown that light pollution can disrupt human and animal sleep patterns, reproductive cycles, and natural body rhythms, such as the production of melatonin, which is inhibited when there is light present. This can lead to various health issues, including sleep deprivation, fatigue, headaches, stress, anxiety, and potentially even cancer.
Light pollution also has ecological effects, such as disrupting ecosystems and increasing the impacts of climate change. It can alter the day/night patterns of both humans and wildlife, leading to habitat loss and a higher risk of predation for some organisms. Additionally, it wastes energy and can create potential safety issues, such as wildlife/visitor conflict in natural protected areas like national parks.
To combat light pollution, individuals can take steps such as turning off lights at night, using shielded and light-efficient fixtures, and limiting light leakage from inside their homes. Public education and legislative change are also important in addressing the impacts of light pollution on humans, wildlife, and the environment.
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It has adverse health effects on humans and wildlife
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, such as over-lighting, failing to use timers and sensors, or using the wrong colour of light. This can result in unwanted, inappropriate, or excessive artificial lighting, which can have adverse health effects on both humans and wildlife.
Adverse Health Effects on Humans
Research suggests that exposure to artificial light at night can negatively impact human health. A 2016 report from the American Medical Association Council on Science and Public Health found that intense, blue-rich LED lighting can decrease visual acuity and create road hazards. Furthermore, a 2023 paper published in GeroScience journal highlighted the growing number of studies indicating a correlation between light pollution and Alzheimer's disease.
Additionally, studies have found a link between exposure to artificial light at night and an increased risk of certain cancers, such as breast cancer and colorectal cancer. For example, a study in Israel showed a statistically significant correlation between outdoor artificial light at night and breast cancer cases, even when controlling for other factors. Another study found that nurses who worked night shifts regularly for 15 years or more had a 35% increased risk of colorectal cancer. While the research is ongoing, these studies suggest a potential connection between light pollution and adverse health outcomes in humans.
Adverse Health Effects on Wildlife
Light pollution can also have harmful effects on wildlife and ecosystems. Scientific evidence suggests that artificial light at night can negatively impact various creatures, including amphibians, birds, mammals, insects, and plants. Nocturnal animals, which are active at night, are particularly affected as light pollution alters their nighttime environment. Predators may use the light to hunt, while prey species rely on darkness for cover, disrupting natural behaviours and ecological balances.
Additionally, light pollution can impact wetland habitats that are home to amphibians like frogs and toads, whose nighttime croaking is part of their breeding ritual. Light pollution can also benefit invasive species, such as cats, foxes, and cane toads, which take advantage of artificial lights for feeding. Overall, light pollution disrupts the natural day and night cycle that all life has relied on for billions of years, affecting the behaviour and life processes of both wildlife and plants.
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Light trespass occurs when unwanted light enters one's property
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 competes with starlight in the night sky, interferes with astronomical observatories, disrupts ecosystems, and has adverse health effects.
Light trespass is a specific category of light pollution. It occurs when unwanted artificial light enters one's property, shining over a neighbour's fence or entering a window from outside. This can cause problems such as sleep deprivation and a reduced quality of life.
Light trespass can originate from both residential and commercial properties and create conflict between neighbours. Common sources of light trespass include floodlights, security lights, and decorative lighting. It is important to consider the effects of light trespass on your project and any surrounding properties, as many locations have strict regulations against it.
To minimise light trespass, consider using lighting fixtures that are designed to limit light spillage, with adjustable features that allow you to direct light where it is needed. Shielded fixtures can also help prevent light from escaping into unwanted areas. Incorporating motion-sensor lights can ensure that outdoor lighting is only activated when necessary, reducing the amount of time lights are on and conserving energy.
By understanding light trespass and implementing thoughtful lighting solutions, you can enjoy a well-lit outdoor space while being a considerate neighbour.
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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 adverse effects on human health, wildlife behaviour, and our ability to observe stars and other celestial objects. It competes with starlight in the night sky, interferes with astronomical observatories, disrupts ecosystems, wastes energy, and increases the impacts of climate change.
Light pollution is a side effect of industrial civilization. Its sources include building exterior and interior lighting, advertising, commercial properties, offices, factories, streetlights, illuminated sporting venues, and fireworks.
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