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Light pollution is the presence of any unwanted, inappropriate, or excessive artificial lighting. It is a global issue, with 83% of the world's people living under light-polluted skies. This has a range of consequences, including adverse effects on human health, wildlife, biodiversity, the environment, and energy consumption. In terms of energy, light pollution wastes energy and money, with higher lighting levels than necessary resulting in significant economic and environmental consequences. It also contributes to air pollution as electricity is usually generated by the combustion of fossil fuels. Therefore, reducing light pollution can help conserve fuel, reduce air pollution, and mitigate climate change.
| Characteristics | Values |
|---|---|
| Energy wasted | In the US, outdoor lighting uses about 120 terawatt-hours of energy in a year |
| Energy wasted | One-third of light in developed countries is wasted by poorly directed or unshielded lamps |
| Energy savings | Using a flat-lens cobra luminaire, which is a full-cutoff fixture, can reduce light pollution and wasted energy |
| Energy savings | Using semi-cutoff fixtures can reduce energy consumption compared to full cutoff designs |
| Energy savings | Using quality lighting design can reduce energy use and energy dependence |
| Energy savings | Using high-efficiency light sources can save energy and reduce light pollution |
| Energy savings | Using the right light sources can reduce energy use and pollutive effects while improving efficiency and visibility |
| Energy savings | Using shielding can reduce glare and light trespass onto neighbouring properties |
| Energy savings | Using outdoor lighting only when and where it is needed can reduce energy use |
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What You'll Learn
- Light pollution wastes energy, money and damages the climate
- It negatively affects human health, increasing risks for sleep disorders, and certain cancers
- It disrupts wildlife patterns and harms biodiversity
- It can be mitigated by using energy-efficient light sources and reducing sky glow
- It is caused by poorly chosen light sources and excessive artificial lighting
Light pollution wastes energy, money and damages the climate
Light pollution is the presence of any unwanted, inappropriate, or excessive artificial lighting. It is a global issue, with 83% of the world's people living under light-polluted skies. This number has increased by at least 49% over 25 years, and the artificially lit areas of the world are expanding at an estimated rate of 2.2% per year.
Light pollution wastes energy, money, and damages the climate. In the US alone, outdoor lighting uses about 120 terawatt-hours of energy in an average year, most of which is used to illuminate streets, offices, and homes. This energy is largely generated by the combustion of fossil fuels, so light pollution contributes to air pollution and climate change.
The consequences of light pollution are wide-ranging and pose serious risks to many aspects of life on Earth. It has been linked to adverse effects on human health, including sleep disorders, obesity, depression, and an increased risk of cancer. Light pollution also threatens wildlife, with studies showing that it impacts animal behaviours such as migration patterns, wake-sleep habits, and habitat formation. It has been estimated that more than four million migratory birds perish each year in the US by colliding with brightly illuminated structures, and light pollution is considered a contributing factor in the decline of certain migratory songbird populations. Light pollution also affects sea turtles, with hatchlings becoming disoriented by artificial lighting and heading inland, where they often die.
However, light pollution is one of the easiest pollutants to remove. Individuals, institutions, and governments can take action to limit light pollution, including changing light bulbs and fixtures, adopting measures to govern development around biodiversity and protected areas, and creating and promoting dark-sky areas. Quality lighting design can reduce energy use and dependence, cut costs, and reduce carbon emissions.
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It negatively affects human health, increasing risks for sleep disorders, and certain cancers
Light pollution is the presence of any unwanted, inappropriate, or excessive artificial lighting. It is a global issue, with a 2016 map published by the World Atlas of Night Sky Brightness showing that vast areas of North America, Europe, the Middle East, and Asia are glowing with light at night.
The consequences of light pollution are wide-ranging and pose serious risks to many aspects of life on Earth. One of the key impacts of light pollution is its negative effect on human health. Research shows that artificial light at night can disrupt the body's biological clock, hampering sleeping cycles and increasing the risk of sleep disorders.
The blue light emitted by cell phones, computers, and LED bulbs has been found to reduce melatonin levels in humans. This disruption to the body's natural rhythms can have significant health consequences, including an increased risk of obesity and depression.
Furthermore, studies have found a correlation between artificial light at night and an increased risk of various forms of cancer, including lung, breast, colorectal, and prostate cancers. The authors of one study recommended that immediate measures should be taken to limit artificial light at night in cities and inside homes.
Light pollution also wastes energy and money, and contributes to climate change. In an average year in the U.S., outdoor lighting uses about 120 terawatt-hours of energy. Conserving energy by reducing light pollution can help to mitigate climate change and reduce air pollution.
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It disrupts wildlife patterns and harms biodiversity
Light pollution has a range of adverse effects on wildlife, disrupting natural patterns and causing harm to biodiversity. The phenomenon is caused by the human-made alteration of outdoor light levels, resulting in unwanted, excessive, or inappropriate artificial lighting. This has consequences for many different species, including birds, sea turtles, insects, and plants.
Firstly, light pollution can disorient migratory birds, causing them to collide with buildings and veer off course during long-distance journeys. The glare of artificial light confuses birds that rely on starlight and moonlight for navigation, contributing to the decline of certain migratory bird populations.
Secondly, light pollution poses a significant threat to sea turtles. Female sea turtles, such as loggerheads, are deterred from returning to their natal beaches for nesting due to bright lights. Additionally, hatchling sea turtles become disoriented by artificial lighting, leading them inland instead of towards the ocean, where they often perish from exhaustion, dehydration, predation, or vehicle collisions.
The impact of light pollution extends to insects as well. Insects, which serve as a primary food source for birds and other animals, are drawn to artificial lights and are instantly killed upon contact. The decline in firefly populations has been linked to light pollution, as it likely interferes with their bioluminescent mating signals.
Lastly, light pollution also affects plants and their natural rhythms. It disrupts predator-prey relationships and plant phenology, further contributing to the disruption of ecosystems.
The consequences of light pollution on wildlife and biodiversity highlight the importance of implementing measures to reduce its impact. This includes adopting nature-friendly lighting practices, such as using light only when and where it is needed, shielding lights to direct them downwards, and creating dark-sky areas to preserve the natural night sky.
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It can be mitigated by using energy-efficient light sources and reducing sky glow
Light pollution is a pressing global issue, with numerous adverse consequences for humans, wildlife, and the environment. It is caused by unwanted, excessive, or inappropriate artificial lighting, which wastes energy and money, and negatively impacts health, ecosystems, and biodiversity.
The good news is that light pollution is one of the easiest pollutants to remove. It can be mitigated by using energy-efficient light sources and reducing sky glow. Energy-efficient light sources, such as LED bulbs, reduce energy consumption and associated emissions, while also saving money. However, it is important to note that simply having energy-efficient lights is not enough—the lights must also be properly directed downwards to reduce sky glow.
Sky glow refers to the brightening of the night sky, primarily over urban areas, due to electric lights from various sources. It interferes with the natural light cycles of humans, wildlife, and plants, causing disruptions to sleep patterns, migration patterns, and habitat formation. Reducing sky glow can be achieved through proper lighting design and installation. This includes ensuring that outdoor lights are shielded and directed downwards, reducing the amount of light escaping upwards into the sky.
Individuals can play a role in reducing sky glow by only using outdoor lighting when and where it is needed, keeping indoor lights from shining outwards through windows, and supporting initiatives to bring back the natural night sky. Institutions and governments can also implement policies and regulations to control outdoor lighting and promote dark-sky areas.
By using energy-efficient light sources and implementing measures to reduce sky glow, we can mitigate the negative impacts of light pollution on our health, the environment, and our wallets.
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It is caused by poorly chosen light sources and excessive artificial lighting
Light pollution is caused by excessive artificial lighting and poorly chosen light sources. It is a global issue, with 83% of the world's population living under light-polluted skies. The problem has been exacerbated by technological advancements and urbanisation, with artificial lighting disrupting natural light cycles and causing a range of problems for humans, wildlife, and the environment.
The energy consequences of light pollution are significant. Poorly chosen light sources and excessive artificial lighting lead to energy waste, as light that shines when and where it is not needed consumes unnecessary energy. This has economic and environmental implications, as the energy used to power excessive lighting could be saved, reducing energy costs and the environmental impact of energy production.
In addition, the choice of lighting technology can impact energy consumption. LED lighting, for example, is highly energy-efficient, but the assumption that "more light is better" has led to an increase in the quantity of light emitted outdoors, contributing to light pollution. Shielding and directing light downwards can help reduce light trespass and glare, improving energy efficiency and reducing light pollution.
The type of light bulb can also make a difference, as seen in studies comparing streetlights with LED lights to those with yellow sodium-vapour lamps. The former was linked to a more significant decline in moth caterpillar abundance and slower development, indicating that the choice of lighting technology can have ecological consequences beyond energy waste.
Furthermore, light pollution disrupts natural ecosystems and human health, with artificial light at night negatively affecting sleep cycles and increasing the risk of various cancers. Addressing light pollution through appropriate lighting design and usage can, therefore, conserve energy, reduce environmental impacts, and mitigate health risks associated with artificial light exposure.
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Frequently asked questions
Light pollution is the presence of any unwanted, inappropriate, or excessive artificial lighting. It is a waste of energy that can cause adverse effects and degrade environmental quality.
Light pollution wastes energy, which has huge economic and environmental consequences. It also increases energy dependence, which leads to higher carbon emissions.
Light pollution severely disrupts nocturnal ecosystems, interferes with the natural rhythms of plants and animals, and mars the wilderness experience and landscape beauty. It also poses risks to human health and safety.
Individuals, institutions, and governments should take actions to limit light pollution, including changing light bulbs and fixtures, adopting measures governing development around biodiversity and protected areas, and creating and promoting dark-sky areas.
