Greta Jimenez
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 has adverse effects on human health, wildlife behavior, and our ability to observe stars and other celestial objects. It is increasing globally, in both developed and developing countries, with 83% of the world's people living under light-polluted skies. Light pollution can be mitigated through individual actions such as turning off lights at night or using shielded, light-efficient fixtures, as well as legislative change and public education.
| 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, boats, fireworks, satellites |
| Effects | Interferes with starlight, disrupts ecosystems, has adverse health effects, wastes energy, increases impacts of climate change |
| Impact | 83% of the world's people live under light-polluted skies, 99% of Europeans and Americans, 80% of North Americans cannot see the Milky Way |
| Solutions | Adjusting light fixtures, using appropriate light bulbs, public education, legislative change, turning off lights, using shielded fixtures, closing curtains |
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What You'll Learn
- Light pollution is a human-made alteration of natural light levels
- It has adverse effects on human health, including sleep and alertness
- It negatively impacts wildlife behaviour and disrupts ecosystems
- Light trespass is a common problem, with unwanted light entering homes
- Light pollution is increasing globally, with 83% of people affected
Light pollution is a human-made alteration of natural light levels
The sources of light pollution include building exterior and interior lighting, advertising, commercial properties, offices, factories, streetlights, illuminated sporting venues, and boats. Light pollution is most acute in urban environments, where the night sky is brightened by excessive artificial lighting. This phenomenon, known as sky glow, is caused by artificial light reflecting in the sky and bouncing off different types of particles in the atmosphere. Sky glow reduces the visibility of stars and the Milky Way, and it can be harmful to astronomy and the health of many organisms.
Light pollution can also lead to light trespass, where unwanted light enters one's property, causing problems such as sleep deprivation. It can further interfere with human and wildlife behaviour, disrupting ecosystems and altering day/night patterns. For example, nocturnal light can interrupt sleep and confuse the circadian rhythm, affecting the production of the hormone melatonin. Studies have shown a link between reduced melatonin levels and various health issues, including cancer.
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. Additionally, the use of motion sensors, timers, and warmer colours of light can help reduce light pollution. Addressing light pollution at a larger scale involves legislative change and public education, as it is influenced by political, social, and economic considerations.
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It has adverse effects on human health, including sleep and alertness
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 effects on human health.
The human health effects of light pollution are primarily related to sleep and alertness. Nocturnal light interrupts sleep and confuses the circadian rhythm—the internal, twenty-four-hour clock that guides day and night activities and affects physiological processes in nearly all living organisms. One of these processes is the production of the hormone melatonin, which is released when it is dark and is inhibited when there is light present. An increased amount of light at night lowers melatonin production, which results in sleep deprivation, fatigue, headaches, stress, anxiety, and other health problems. Recent studies have also shown a connection between reduced melatonin levels and cancer.
The impact of light pollution on sleep and alertness has been widely documented. Studies on night workers have established artificial light at night (ALAN) as a lifestyle risk factor for sleep disorders, cancer, cardiovascular disease, type 2 diabetes, obesity, and depression, among other issues. Light pollution can also cause blind spots and create potential safety issues for humans and wildlife.
To mitigate the adverse effects of light pollution on human health, individuals can adopt lifestyle changes such as shielding exterior lights, using shades to minimise interior light output, employing motion sensors or timers for exterior lighting, choosing warmer colours of light, using dimmable lighting, and turning off lights when not in use.
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It negatively impacts wildlife behaviour and disrupts ecosystems
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 the use of lighting in advertising, commercial properties, offices, factories, streetlights, and illuminated sporting venues. Light pollution competes with starlight in the night sky, interferes with astronomical observatories, and disrupts ecosystems.
Light pollution negatively impacts wildlife behaviour and disrupts ecosystems. Nocturnal light from light pollution interrupts the sleep of many organisms, confusing their internal, twenty-four-hour circadian rhythm that guides day and night activities and affects physiological processes. For example, an increase in light at night lowers melatonin production, resulting in sleep deprivation, fatigue, headaches, stress, anxiety, and other health problems. Recent studies have also shown a connection between reduced melatonin levels and cancer.
Light pollution can also repel some organisms away from their natural habitat, which could be considered a form of habitat loss. It can also attract them to areas where they should not be, leading to a high concentration of animals that can be easily preyed on or killed. For example, artificial light from boats, buildings, street lights, and fireworks contribute to light pollution in Victoria Harbour, Hong Kong, which is detrimental to the health of people and animals in the area.
Light pollution also alters the day/night patterns of both humans and wildlife. Migratory birds, pollinators, sea turtles, and mammals, including humans, are affected by light pollution. Excessive artificial light can also cause potential safety issues, such as wildlife/visitor conflict in national parks.
To combat light pollution, individuals can turn off lights at night, use shielded, light-efficient fixtures that prevent light from reaching unwanted areas, and limit the amount of light from inside the house leaking out by closing window blinds and curtains at night.
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Light trespass is a common problem, with unwanted light entering homes
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, streetlights, and illuminated sporting venues. Light pollution has harmful effects on human health, ecosystems, and the aesthetic environment.
One specific type of light pollution is light trespass, which occurs when unwanted artificial light spills over from one property to another. This can be caused by poorly directed lighting fixtures, excessive brightness, or the inappropriate placement of lights. For example, a bright floodlight shining into a neighbour's yard or overly bright landscape lights illuminating a neighbour's windows at night. Light trespass can negatively impact the quality of life for those affected, including sleep deprivation, reduced privacy, and a diminished enjoyment of outdoor spaces.
Homeowners who invest in outdoor lighting to enhance their properties should consider the potential impact on their neighbours. It is recommended to consult with professionals specializing in outdoor lighting to enhance one's property while being considerate of neighbours. Maintaining open lines of communication with neighbours is also essential to addressing light trespass concerns.
To minimize light trespass, individuals can opt for lighting fixtures designed to reduce light spillage, use adjustable features to direct light where needed, and incorporate motion-sensor lights to ensure lighting is only activated when necessary. These strategies can help maintain a welcoming atmosphere without causing discomfort to nearby properties.
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Light pollution is increasing globally, with 83% of people affected
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 harmful effects on streetlights, greenhouses, and satellites, among other things. It is most severe in highly industrialized, densely populated areas of North America, Europe, and Asia, and in major cities in the Middle East and North Africa.
The problem of light pollution is poised to get worse without regulatory action. One solution is to use shielded or dimmable lights that can turn off when not in use, as well as more appropriate light bulbs. Citizens can also band together to enact local legislation and advocate for better lighting practices.
The Dark Sky Movement is one example of a successful advocacy group that has worked to restore the nighttime environment and protect communities and wildlife from light pollution. They have helped to establish codes and statutes that reduce light pollution and educate the public about its harmful effects.
Light pollution is a global issue that requires collective efforts to address. With increasing urbanization and industrialization, it is important to find a balance between human activities and the preservation of natural environments and ecosystems.
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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.
Sources of light pollution include building exterior and interior lighting, advertising, commercial properties, offices, factories, streetlights, illuminated sporting venues, boats, fireworks, and satellites.
Light pollution has adverse effects on human health, wildlife behaviour, and our ability to observe stars and other celestial objects. It can also disrupt ecosystems, waste energy, increase the impacts of climate change, and spoil aesthetic environments.
