Bronte Wells
Light pollution, the excessive or inappropriate use of outdoor artificial light, is a global issue that affects human health, wildlife behaviour, and our ability to observe celestial objects. While artificial light can be beneficial, providing safety and comfort, its excessive use has negative consequences. Light pollution disrupts natural rhythms in humans and wildlife, impacts the environment, and can lead to energy waste. With increasing awareness, individuals, institutions, and governments are taking actions to reduce light pollution, such as adopting more efficient lighting technologies and creating dark-sky areas. So, is light pollution good or bad? The answer lies in balancing the benefits of artificial light with the need to minimise its adverse effects on our health, environment, and natural darkness.
| Characteristics | Values |
|---|---|
| Definition | Excessive or inappropriate use of outdoor artificial light |
| Sources | Street lamps, parking lot/shopping mall lights, exterior lights, neon signs, illuminated signboards, LED lights |
| Effects | Disrupts nocturnal ecosystems, affects human health, interferes with natural rhythms of plants and animals, mars wilderness experience and landscape beauty, wastes energy, affects wildlife behaviour, reduces number of visible stars |
| Solutions | Use fully shielded, light-efficient fixtures, adopt measures governing development around biodiversity and protected areas, create and promote dark-sky areas, use reflective paint or self-luminous markers, smarter streetlights that concentrate light downward |
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What You'll Learn
- Light pollution impacts human health, causing sleep deprivation, stress, and anxiety
- It affects wildlife behaviour, migration, reproduction, and hunting
- It wastes energy and increases light trespass
- Light pollution disrupts our view of the night sky
- It can be reduced by turning off lights and using shielded fixtures
Light pollution impacts human health, causing sleep deprivation, stress, and anxiety
Light pollution, defined as the excessive or inappropriate use of outdoor artificial light, is a global issue that negatively impacts human health, wildlife behaviour, and our ability to observe celestial objects. One of the most pervasive forms of light pollution is sky glow, which affects over 80% of the world's population and 99% of Americans and Europeans.
Light pollution can have detrimental effects on human health, including sleep deprivation, stress, and anxiety. Nocturnal light exposure can interrupt the natural circadian rhythm, the internal 24-hour clock that regulates day and night activities and physiological processes. This disruption can lead to reduced melatonin production, a hormone released in the dark that is essential for sleep. As a result, individuals may experience sleep deprivation, fatigue, headaches, stress, and anxiety.
Research has also linked light pollution to an increased risk of obesity, depression, sleep disorders, and even certain types of cancer. Shift workers, for example, who sleep during the daytime, are at high risk of developing shift work disorder, a circadian rhythm disorder characterized by insufficient sleep, excessive sleepiness, and mood problems.
Additionally, light pollution can cause visual discomfort, known as glare, and excessive or confusing groupings of light sources, referred to as clutter. The intrusion of unwanted light into spaces is called light trespass and can impact the quality of sleep, leading to repeated awakenings and interruptions to the sleep cycle.
The negative impacts of light pollution on human health have sparked a global movement to reduce it. Organizations like the International Dark Sky Association (IDA) aim to preserve the natural night sky and educate the public about reducing light emissions.
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It affects wildlife behaviour, migration, reproduction, and hunting
Light pollution has a significant impact on wildlife behaviour, migration, reproduction, and hunting. It disrupts the natural rhythm of day and night, which is encoded in the DNA of all plants and animals. This disruption can have far-reaching consequences for wildlife, altering their behaviour and ecological functions.
Nocturnal animals, which are active at night, are particularly affected by light pollution. The introduction of artificial light turns night into day in their environment, disrupting their natural behaviours. Predators that rely on light to hunt can find it easier to spot prey, while prey species that use darkness as cover become more vulnerable. This disruption can have a ripple effect on the entire food chain, impacting the survival of various species.
Migratory birds that navigate by moonlight and starlight can be led off course by artificial light, causing them to veer towards illuminated buildings and towers. This disorientation leads to the deaths of millions of birds annually. Additionally, artificial light can disrupt the migration timing of these birds, causing them to migrate too early or too late, missing ideal climate conditions for nesting, foraging, and other vital behaviours.
Light pollution also affects the reproduction of certain species. For example, amphibians like frogs and toads have breeding rituals that involve nighttime croaking. Artificial lights can interfere with these rituals, reducing their populations.
Overall, light pollution has far-reaching consequences for wildlife, altering their natural behaviours and disrupting ecological functions. It underscores the importance of initiatives to reduce light pollution and restore the natural balance of light and darkness in the environment.
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It wastes energy and increases light trespass
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It has been estimated that 83% of the world's population lives under light-polluted skies, and artificial light at night can have adverse effects on human health and the environment.
Wastes energy
Light pollution wastes energy and money and damages the climate. In an average year in the US alone, outdoor lighting uses about 120 terawatt-hours of energy, mostly to illuminate streets and parking lots. That’s enough energy to meet New York City’s total electricity needs for two years. DarkSky estimates that at least 30% of all outdoor lighting in the US alone is wasted, mostly by lights that aren’t shielded. That adds up to $3.3 billion and the release of 21 million tons of carbon dioxide per year.
To offset all that carbon dioxide, we’d have to plant 875 million trees annually. Environmental responsibility requires energy efficiency and conservation. Installing quality outdoor lighting could cut energy use by 60 to 70%, save billions of dollars, and cut carbon emissions.
Light trespass
Light trespass is when light extends into an area where it is not wanted or needed, such as when a strong light enters the window of a home from outside, causing problems such as sleep deprivation. A number of cities in the US have developed standards for outdoor lighting to protect the rights of their citizens against light trespass.
Light trespass can also impact observations when artificial light directly enters the tube of the telescope and is reflected from non-optical surfaces until it eventually reaches the eyepiece. This direct form of light pollution causes a glow across the field of view, reducing contrast. Light trespass also makes it hard for a visual observer to become sufficiently adapted to the dark.
Solutions
Possible solutions to reduce light trespass and wasted energy include:
- Utilizing light sources of minimum intensity necessary to accomplish the light's purpose.
- Turning lights off using a timer or occupancy sensor or manually when not needed.
- Using shielding so that light does not spill beyond where it is needed.
- Reducing glare by restricting beams to downward cones.
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Light pollution disrupts 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 excessive or inappropriate use of outdoor artificial light, which has a negative impact on human health, wildlife behaviour, and our ability to observe the night sky.
One of the most pervasive forms of light pollution is sky glow, caused by anthropogenic activities. Artificial light from street lamps, parking lots, shopping malls, exterior lights, and illuminated signs shines outward and upward into the sky, where it is not wanted or needed. This light pollution can be reduced by using fully shielded, light-efficient fixtures that prevent light from escaping directly from fixtures and travelling above the horizontal.
The effects of light pollution on our view of the night sky are significant. Citizen scientists and researchers have found that we are losing our view of the sky at a rapid rate of almost 10% each year. According to a 2023 study published in Science magazine, the number of stars visible in the night sky decreased by 7-10% per year from 2011 to 2022. This means that a location with 250 visible stars in 2011 would have only 100 visible stars a decade later.
The type of lighting used has also contributed to the problem. The recent shift from older light bulbs that emitted redder light to LEDs that shine more brightly in blue has increased the amount of light pollution. Blue light scatters more easily in the atmosphere, and the detectors in many Earth-observing satellites are less sensitive to it. As a result, satellites mostly detect light that shines straight upward from cities and poorly constructed streetlights, contributing to the glow in the sky.
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It can be reduced by turning off lights and using shielded fixtures
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It has been proven to have harmful effects on human health, wildlife behaviour, and our ability to observe stars and other celestial objects.
Light pollution can be reduced by turning off unnecessary indoor lighting, especially in empty office buildings at night. This will help prevent the leakage of interior light into the night sky. Research shows that 75% of artificial sky brightness comes from light escaping directly from fixtures, so turning off unnecessary lights can significantly reduce sky brightness.
Another way to reduce light pollution is by using shielded fixtures. Light shields are accessories that can be attached to the top and/or sides of light fixtures. They focus light downward or inward, preventing it from spreading in unwanted directions. This reduces glare and improves night vision, making it safer for motorists and pedestrians. Shielded fixtures also prevent light trespass, which is when light falls into areas where it is not intended, wanted, or needed, such as a streetlight illuminating a nearby bedroom window.
DarkSky International offers a searchable database of DarkSky Approved light fixtures that are fully shielded and have a low CCT. Their database also includes other devices such as timers and controllers that can help reduce light pollution.
By turning off unnecessary lights and using shielded fixtures, we can reduce light pollution and its negative impacts on human health, wildlife, and our ability to observe 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 the presence of unwanted, inappropriate, or excessive artificial lighting.
Light pollution can negatively impact human health. Nocturnal light can interrupt sleep and confuse the circadian rhythm, which is the internal 24-hour clock that guides day and night activities and affects physiological processes. This can lead to health issues such as sleep deprivation, fatigue, headaches, stress, anxiety, and potentially, an increased risk of cancer.
Light pollution can have severe impacts on nocturnal ecosystems, disrupting the natural rhythms of plants and animals. It can interfere with migration, reproduction, hunting, and feeding behaviours. For example, newly hatched sea turtles are drawn towards artificial light sources instead of the ocean, leading to dehydration and predation. It also mars the wilderness experience and landscape beauty.
Individuals, institutions, and governments all have a role in reducing light pollution. Simple actions like turning off unnecessary lights and using fully shielded, light-efficient fixtures can prevent light trespass and reduce sky glow. Governments can implement policies and pass legislation to limit light pollution, such as the laws enacted in France, Slovenia, and Croatia. Organisations like the International Dark-Sky Association (IDA) advocate for smarter lighting solutions that concentrate light downward, improving efficiency and reducing light pollution.
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