Brian Barton
Light pollution is one of the fastest-growing and most pervasive forms of environmental pollution, impacting human health, wildlife, and the environment. Caused by inefficient, annoying, and unnecessary artificial lighting, light pollution disrupts the natural rhythm of day and night, affecting human and animal health, ecosystems, and the environment at large. With artificial light increasing by around 2% per year globally, light pollution has become a pressing issue that requires immediate attention and action.
| Characteristics | Values |
|---|---|
| Impact on wildlife | Disrupts the activities of insects, birds, and other animals |
| Affects insect movement, foraging, reproduction, and predation | |
| Disrupts the natural habits of nocturnal animals | |
| Affects migration patterns and habitat formation | |
| Increases bird mortality due to collisions with artificial structures | |
| Alters marine ecosystems | |
| Impact on humans | Disrupts the body's biological clock |
| Hampers sleeping cycles | |
| Lowers melatonin production, resulting in sleep deprivation, fatigue, headaches, stress, anxiety, and other health problems | |
| Increases the risk of cancer | |
| Impact on the environment | Makes it difficult to view celestial objects |
| Disrupts photosynthesis |
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What You'll Learn
Light pollution disrupts the natural body rhythms of humans and animals
Light pollution is a growing issue that is impacting the environment and human and animal health. It is caused by inefficient, annoying, and unnecessary artificial lighting, which disrupts the natural rhythm of day and night that all living things are encoded with.
The brightening of the night sky, or "sky glow", is one of the most pervasive forms of light pollution. Caused by electric lights from cars, streetlamps, offices, factories, advertising, and buildings, sky glow turns night into day for people who work or play long after sunset. This has a significant impact on humans and animals, disrupting their natural body rhythms and their internal twenty-four-hour clock, or circadian rhythm.
For humans, increased light at night lowers melatonin production, leading to sleep deprivation, fatigue, headaches, stress, anxiety, and other health problems. Studies have also shown a link between reduced melatonin levels and cancer. Blue light, emitted by cell phones, computers, and LED bulbs, has been found to particularly reduce melatonin levels in humans.
Light pollution also impacts the natural behaviours of animals, including migration patterns, sleep habits, and habitat formation. Nocturnal animals that use the cover of night to hunt or hide are affected, disrupting food webs. For example, bats avoid lit-up areas to stay hidden from predators such as owls. Fish also adapt their behaviour in response to light, moving to deeper waters. Insects are drawn to artificial lights, which can be fatal and contribute to declining insect populations. This negatively impacts all species that rely on insects for food or pollination.
Light pollution is a pressing issue that requires immediate measures to limit artificial light at night in cities and homes. It is essential to address this form of pollution to protect the health and natural rhythms of humans and animals alike.
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It impacts marine life and ecosystems
Light pollution has a significant impact on marine life and ecosystems. It disrupts the natural rhythm of day and night, which is crucial for marine organisms' survival and encoded in their DNA. For instance, artificial light can deter female sea turtles from coming ashore to lay their eggs, and it can cause hatchlings to head towards inland lights instead of the moonlight on the water, leading to dehydration or starvation. Moonlight and starlight are essential cues for marine life, and their glow can be overwhelmed by artificial light, leading to shifts in hormonal cycles, interspecies behaviour, and reproduction.
Research has shown that light pollution can alter marine ecosystems by reducing the number of filter-feeding animals, such as sea squirts and sea bristles, near lighted panels. Coastal areas are particularly affected by light pollution, with an ever-increasing flood of light from human development. This can negatively impact a wide range of organisms, from whales and fish to coral and plankton. The widespread use of LED lighting exacerbates the problem, as LEDs produce light with shorter wavelengths that penetrate deeper into the water.
Light pollution also affects the daily vertical migration of zooplankton. In the presence of light pollution, the illumination of the environment remains important at night, reducing the number of zooplankton individuals that migrate and the amplitude of vertical migration. This can lead to a proliferation of microalgae on the water surface and potential changes in prey-predator relationships, impacting food chains and water quality.
The photosensitivity of aquatic organisms is a function of habitat depth. Surface fish are sensitive to red lights, while deep-water fish are sensitive to blue lights. Light pollution alters the intensities, colours, and frequencies to which these organisms are usually exposed, as it changes the light intensities and patterns that sea creatures have evolved to adapt to.
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It affects insect movement, foraging, reproduction and predation
Light pollution is a significant but often overlooked driver of the rapid decline of insect populations. Artificial light at night can affect every aspect of insects' lives, from luring moths to their deaths around bulbs to disrupting mating signals.
Insect Movement
Artificial light at night can alter the distribution of insects in a landscape. Insects that are repelled by light, such as weta, spend less time foraging in light-polluted areas. On the other hand, many species, including moths, beetles, and other pollinators, are drawn to artificial light sources, often to their detriment. This phenomenon, known as phototaxis, causes insects to waste energy, become easy prey, or die from exhaustion. Moths, for example, orient themselves by fixating on distant sources of light, such as the moon. When artificial light sources are introduced, moths fixate on these closer lights and are forced to reorient constantly, resulting in erratic flight patterns.
Insect Foraging
Light pollution can affect the search for food in insects. Insects that avoid light spend less time foraging in illuminated areas. Additionally, insects that shift their foraging activity to the night-time to avoid competition may experience cold stress, while nocturnal insects that continue to forage alongside may experience reduced growth rates due to increased competition.
Insect Reproduction
Artificial light at night can interfere with the efficient acquisition of food, which is vital to the reproductive success of insects. It can also delay or eliminate the window of time during which night-active insects engage in courtship and mating. Fireflies, for example, use bioluminescence to communicate and attract mates. In light-polluted environments, female fireflies struggle to differentiate between male fireflies and artificial lights.
Insect Predation
Light pollution can increase the risk of predation for insects. Insects are important prey for many species, and artificial lights can trap them, making them easier targets for predators such as spiders, bats, rats, shorebirds, geckos, and cane toads. This increase in predation risk is likely to contribute to the rapid extinction of affected insect species.
The effects of light pollution on insect movement, foraging, reproduction, and predation have far-reaching consequences, threatening biodiversity and ecological balance.
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Light pollution is linked to increased cancer risk in humans
Light pollution is a growing concern for environmentalists, naturalists, and medical researchers, who consider it to be one of the fastest-growing and most pervasive forms of environmental pollution. The artificial light that causes light pollution has been linked to a range of health issues, including insomnia, fatigue, headaches, stress, anxiety, and even cancer.
Light pollution disrupts the natural circadian rhythm, the internal 24-hour clock that guides day and night activities and affects physiological processes in almost all living beings. This disruption has been linked to an increased risk of cancer, particularly hormone-sensitive cancers such as breast, colon, and prostate cancers. Studies have shown that women who work night shifts have higher rates of breast cancer, while blind women, who are less likely to be exposed to artificial light at night, have lower risks.
Artificial light at night (ALAN) has been identified as a potential risk factor, with its disruptive effects on endocrine function leading to a focus on the association between ALAN exposure and breast and prostate cancers. ALAN exposure has also been linked to increased cancer incidence in shift workers, with studies indicating a presence of increased risk with increased duration of shift work.
Blue light, in particular, has been shown to reduce melatonin levels in humans. Melatonin is a hormone produced in nighttime darkness that promotes sleep and has anti-inflammatory and tumor-inhibiting properties. A reduction in melatonin levels can, therefore, increase the risk of cancer.
While the full scope of the problem and the most susceptible individuals are not yet clear, light pollution's link to increased cancer risk underscores the importance of addressing this growing environmental concern.
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It disrupts bird migration and causes higher bird mortality
Light pollution is a pressing issue that has a significant impact on the environment and ecosystems. It disrupts the natural rhythm of day and night, affecting both wildlife and humans. One of the most vulnerable groups affected by light pollution is migratory birds, which experience detrimental consequences, including higher mortality rates and disrupted migration patterns.
Migratory birds are highly susceptible to the adverse effects of light pollution, particularly those that migrate at night. The presence of artificial light can disrupt the biological clocks of these birds, causing them to misinterpret the light as a longer period of daylight. As a result, they may initiate their migration earlier or later than they should, leading to mistiming issues. This mistiming can have severe consequences if the necessary environmental conditions and resources are unavailable during their journey or upon their arrival at their destination.
Artificial light sources, such as those in urban areas, can attract and disorient migrating birds, causing them to deviate from their intended migration paths. Bright city lights can lure birds toward urban centres, putting them at risk of colliding with buildings, towers, electric wires, and other man-made infrastructure. These collisions often result in fatal injuries or leave the birds vulnerable to predators, dehydration, starvation, or poaching.
Additionally, the energy expended by birds during these unintended detours can be significant, leading to exhaustion and a depletion of their energy reserves. This exhaustion puts them at further risk of predation and collision. Certain species of birds, such as nocturnal migrants and seabirds, are more susceptible to these dangers, with some being identified as 'super colliders'.
To address these issues, global initiatives, such as World Migratory Bird Day, aim to raise awareness and encourage governments and communities to take action against light pollution. Efforts include turning off unnecessary lights during peak bird migration periods, using shielded lights, and implementing species-specific measures to reduce the impact of artificial light on migratory birds.
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Frequently asked questions
Light pollution is the light generated by human activity that makes it difficult to see things in the sky at night. It is caused by artificial light sources such as streetlamps, offices, factories, outdoor advertising, and buildings.
Light pollution has a significant impact on the environment, affecting both wildlife and ecosystems. It disrupts the natural rhythm of day and night, which is encoded in the DNA of all plants and animals. This disruption can alter migration patterns, wake-sleep habits, habitat formation, and food webs. It also impacts marine life, with sea turtles, for example, becoming disoriented by lights and struggling to find the ocean.
Light pollution can have various negative effects on human health. It can lower melatonin production, leading to sleep deprivation, fatigue, headaches, stress, anxiety, and potentially increasing the risk of cancer. It also disrupts the body's circadian rhythm, the internal 24-hour clock that guides day and night activities, affecting physiological processes.
