Kiera Jefferson
Light and noise pollution have had a significant impact on the biosphere. Light pollution, caused by excessive artificial lighting, has disrupted the natural rhythm of day and night, affecting both humans and wildlife. It has been linked to health issues, including breast cancer, and has also impacted wildlife behaviour, with declining insect populations affecting food webs and the reproductive capacity of certain species. Noise pollution, on the other hand, is unwanted noise that has detrimental effects on human health, wildlife, and environmental quality. It can cause hearing loss, raise blood pressure, and impact sleep and communication. Research has shown that noise pollution can alter biological communities, affecting species richness and abundance, particularly for acoustically oriented organisms. Both light and noise pollution have far-reaching consequences for ecosystems and biodiversity, highlighting the need for further research and mitigation strategies.
| Characteristics | Values |
|---|---|
| Light pollution | Excessive or inappropriate use of outdoor artificial light |
| Affected by light pollution | Humans, wildlife, environment, climate |
| Impact on humans | Sleep deprivation, fatigue, headaches, stress, anxiety, other health problems |
| Impact on wildlife | Affects migration patterns, wake-sleep habits, feeding behaviour, breeding cycles, mating calls, reproductive capacity |
| Noise pollution | Unwanted or excessive sound |
| Affected by noise pollution | Humans, wildlife, environmental quality |
| Impact on humans | Hearing loss, raised blood pressure, increased pulse rate, irritability, anxiety, mental fatigue, interference with sleep, recreation, personal communication |
| Impact on wildlife | Changes in natural behaviour, relocation, reduced foraging efficiency, reduced communication |
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What You'll Learn
- Light pollution disrupts the natural day-night cycle of flora and fauna
- Nocturnal light can cause sleep disruption and negatively impact human health
- Noise pollution can cause hearing loss and raise blood pressure in humans
- Unwanted sound can negatively impact wildlife, affecting species richness and abundance
- Artificial light can confuse migrating birds and sea turtles, often leading to death
Light pollution disrupts the natural day-night cycle of flora and fauna
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It has been rapidly increasing, with the illumination level in developed countries increasing tenfold over the last 50 years. More than 80% of the world's population, and 99% of Americans and Europeans, live under sky glow.
Artificial light has been shown to affect the behaviour of animals, including migration patterns, wake-sleep habits, and habitat formation. Sea turtles, for example, are drawn to light. They hatch on beaches and find the sea by detecting the bright horizon over the ocean, but artificial lights draw them away from the ocean. In Florida alone, millions of hatchlings die this way every year. Birds that migrate or hunt at night navigate by moonlight and starlight, but artificial light can cause them to wander off course and toward dangerous areas. Many cities have adopted a "Lights Out" program to turn off building lights during bird migration.
Artificial light also attracts insects, a primary food source for birds and other animals. Insects are instantly killed upon contact with light sources, and their declining populations negatively impact all species that rely on them for food or pollination. Nocturnal animals that use rod cells in their eyes to see can be blinded by sudden changes in illumination, rendering their retinas saturated. Once they venture into dark areas, it takes 10 to 40 minutes for their night vision to fully return.
Light pollution also affects plants. Many species of plants rely on the length of the night to indicate the proper season for budding and flowering. The timing between flowering and pollinators or gatherers may not mesh, disrupting the natural cycle.
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Nocturnal light can cause sleep disruption and negatively impact human health
Artificial light at night can wreak havoc on the natural body rhythms of both humans and animals. Nocturnal light interrupts the circadian rhythm, the internal 24-hour clock that guides day and night activities and affects physiological processes in nearly all living organisms. One of these processes is melatonin production, which is released when it is dark and inhibited when there is light present. Lowered melatonin production due to artificial light at night can result in sleep deprivation, fatigue, headaches, stress, anxiety, and other health problems. Studies have also shown a connection between reduced melatonin levels and cancer, as well as an increased risk of weight gain.
In addition to disrupting melatonin production, artificial light at night can also impact other aspects of human health. Research has linked short sleep duration due to light pollution to an increased risk of depression, diabetes, and cardiovascular problems. Furthermore, the proliferation of electronics with screens and energy-efficient lighting has increased exposure to blue wavelengths, which are particularly disruptive to sleep and have been linked to cancer, diabetes, heart disease, and obesity.
To mitigate the negative impacts of nocturnal light on sleep and health, it is recommended to reduce exposure to artificial light at night. This can be achieved by minimizing screen time before bedtime, using motion-activated lights in hallways or bathrooms, installing blackout curtains, or wearing a sleep mask. By taking these steps, individuals can help restore their natural circadian rhythm and improve their overall health and well-being.
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Noise pollution can cause hearing loss and raise blood pressure in humans
Light and noise pollution have a significant impact on the biosphere. While light pollution disrupts the natural rhythm of day and night, noise pollution can cause hearing loss and raise blood pressure in humans.
Noise pollution can have a detrimental impact on human health, particularly in the form of hearing loss and increased blood pressure. Firstly, exposure to high levels of noise can lead to permanent hearing loss. This occurs when the sensitive structures in the inner ear, including hair cells, are damaged or destroyed by loud sounds. Unlike birds and amphibians, human hair cells do not regenerate, resulting in irreversible hearing impairment. The impact of noise exposure on hearing may be gradual, with individuals initially experiencing distorted or muffled sounds and difficulty understanding speech. Prolonged exposure to loud noise in the workplace or other environments can contribute to this type of hearing loss. Additionally, short-term exposure to loud noise can cause temporary hearing changes or tinnitus, which may persist with repeated exposure.
The effects of noise-induced hearing loss are significant, often leading to the need for hearing aids and impairing one's ability to hear high-frequency sounds and understand speech. This can result in serious communication difficulties and social implications. According to a CDC study, approximately 10 million adults in the U.S. under the age of 70 exhibit signs of hearing loss due to noise exposure. This issue is not limited to adults, as an estimated 17% of teens also show indications of noise-induced hearing loss.
In addition to hearing loss, noise pollution has been linked to an increased risk of hypertension or high blood pressure. Studies have found a positive association between occupational noise exposure and elevated blood pressure levels. Specifically, individuals with mild and high noise-induced hearing loss had a 34% and 281% higher risk of hypertension, respectively. Aircraft noise, particularly during nighttime, has been shown to impair endothelial function and increase blood pressure in individuals with or at risk for coronary artery disease.
The impact of noise pollution on blood pressure may be attributed to various physiological mechanisms. Environmental stressors, including traffic noise, can activate central stress responses and lead to vascular inflammation and oxidative stress, ultimately contributing to increased blood pressure. These stressors can also cause sympathovagal imbalance, endothelial dysfunction, increased circulating cytokines, and circadian disruption, which are associated with cardiovascular issues. However, further research is needed to establish noise exposure as an official risk factor for hypertension.
Overall, noise pollution poses a significant threat to human health, contributing to both hearing loss and elevated blood pressure. These issues have widespread implications for individuals' well-being, communication abilities, and cardiovascular health. Addressing noise pollution and implementing preventive measures are crucial to mitigate these adverse effects and improve public health outcomes.
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Unwanted sound can negatively impact wildlife, affecting species richness and abundance
Unwanted sound, or noise pollution, can have a detrimental impact on wildlife, affecting species richness and abundance. This is a growing area of ecological research, with increasing evidence of the negative consequences of anthropogenic noise on biodiversity.
Noise pollution has been shown to alter the behaviours of animals, including acoustic communication, foraging, and vigilance. For example, grasshoppers with and without acoustic receptors have been found to have reduced species richness and abundance in quieter areas near noise-exposed environments, suggesting that noise pollution can have indirect effects on biological communities.
Studies have also demonstrated that the occupancy, diversity, and abundance of avian species are negatively impacted by anthropogenic noise. Bird species in forest sites have been found to have lower total abundance and species richness in noise-exposed areas, with some individual species exhibiting significantly lower abundance. Nocturnal noise has also been found to limit the species richness of owls in urban environments.
Underwater noises from shipping, pile drivers, sonars, seismic testing, and wind farms can significantly impact marine life. Noise pollution can modify the behaviour and physiology of invertebrates and is suspected to increase infection risks and alter the spawning behaviour of affected species.
Overall, unwanted sound can negatively impact wildlife by reducing species richness and abundance, altering behaviours, and disrupting natural body rhythms. These effects can ultimately influence population viability and the persistence of many species.
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Artificial light can confuse migrating birds and sea turtles, often leading to death
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It has been rapidly increasing, with the illumination level in developed countries increasing tenfold over the last 50 years. All life has relied on the Earth's predictable rhythm of day and night, which is encoded in the DNA of all plants and animals. Humans have disrupted this cycle by lighting up the night.
Artificial light poses a threat to migrating birds. It can confuse them, throwing them off their migration paths, and leading them towards urban areas. This causes exhaustion, leaving them vulnerable to other threats. Birds are attracted to bright lights, which can result in fatal collisions with buildings. Research has found that the vast majority of collision deaths are caused by low- and medium-rise buildings, though skyscrapers cause a higher rate of deaths.
Light pollution also affects sea turtles. Artificial light from beachfront properties can cause hatchlings to crawl towards the lights or in circles on the beach, disorienting them. In natural conditions, the brightest horizon would be the ocean, but now, excess lighting from nearshore buildings and streets draws the turtles towards land, where they may be eaten by predators or run over.
To mitigate the impact of light pollution on sea turtles, some coastal communities have passed ordinances requiring residents to turn off beachfront lights during turtle nesting season. However, these ordinances are not always enforced, and they do not address the issue of sky glow near cities. It is recommended that people visiting the beach at night leave portable lights at home, remove purely decorative lights, and turn off exterior lights when they are not in use.
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Frequently asked questions
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It has been shown to affect both flora and fauna. For instance, prolonged exposure to artificial light prevents many trees from adjusting to seasonal variations, which, in turn, affects the wildlife that depends on them for their natural habitat. Light pollution also wreaks havoc on the natural body rhythms of both humans and animals, interrupting sleep and confusing the internal, twenty-four-hour clock that guides day and night activities and affects physiological processes.
Noise pollution has been shown to alter the natural behaviours of animals or cause them to relocate to avoid noisy areas. For example, a study published in 2010 found that noise pollution decreased the foraging efficiency of an acoustic predator, the greater mouse-eared bat. Noise pollution can also reduce the reproductive capacity of frogs, as they inhibit their mating calls when exposed to excessive light at night.
At certain levels and durations of exposure, noise pollution can cause physical damage to the eardrum and the sensitive hair cells of the inner ear, resulting in temporary or permanent hearing loss. It can also raise blood pressure and pulse rates, cause irritability, anxiety, and mental fatigue, and interfere with sleep, recreation, and personal communication.
Light pollution has been shown to have a consistent association with exposure to indoor artificial nighttime light. Studies in Israel have found a statistically significant correlation between outdoor artificial light at night and breast cancer, with women living in neighbourhoods where it was bright enough to read outside at night having a 73% higher risk of developing breast cancer.
