Brian Barton
Light pollution is a growing problem that affects people, wildlife, and the environment. It refers to the human-made alteration of outdoor light levels from those occurring naturally, resulting in unwanted, inappropriate, or excessive artificial lighting. While light pollution is not explicitly illegal, there is increasing recognition of its negative impacts, and some countries and cities have introduced legislation to mitigate it. For example, the UK introduced its first law tackling light pollution in 2006 under the Clean Neighbourhoods and Environment Act, and cities like Shanghai and Seoul have imposed strict limits on brightness and curfews. However, enforcement remains a challenge, and light pollution continues to disrupt natural rhythms, impact human health, and diminish the beauty of the night sky.
| Characteristics | Values |
|---|---|
| Definition | Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. |
| Synonyms | Ecological light pollution, Skyglow |
| Sources | Car headlights, streetlamps, office buildings, security lighting, commercial lighting, unshielded lamps, LED lighting |
| Effects | Disrupts the nocturnal behaviours of insects, birds, reptiles, and mammals, as well as the circadian rhythms of daytime species, including humans. It also affects the migration, reproduction and feeding patterns of wildlife. |
| Impact on Humans | Sleep dysfunction, disrupted melatonin production, distress, diminished property value |
| Impact on Wildlife | Confuses migrating birds, affects mating, sleep, and feeding habits of animals, disrupts predator-prey relationships, affects plant phenology and pollination |
| Impact on Astronomy | Obscures visibility of stars, mars wilderness experience, landscape beauty |
| Impact on Energy | Wastes energy, increases impacts of climate change |
| Solutions | Dim lights, point them towards the ground, use longer-wavelength bulbs, use warmer colours, use light only where it's needed, keep lights no brighter than necessary, use shielding to reduce glare and light trespass |
| Legislation | The first UK law tackling light pollution came into force in 2006 under Section 102 of the Clean Neighbourhoods and Environment Act (2005). However, this law only tackles incidents of particularly bad lighting that cause a real nuisance. Countries like France, Slovenia, and Croatia have laws to limit light pollution. Shanghai and Seoul impose strict limits on brightness, curfews, and colour spectrums. |
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What You'll Learn
Light pollution's impact on wildlife and ecosystems
Light pollution, defined as the human-made alteration of outdoor light levels from those occurring naturally, has a significant impact on wildlife and ecosystems. This impact has been known for thousands of years, with hunters and fishers using lights to attract their prey. However, with the spread of electricity in the past century, the problem of artificial lighting has become more pervasive.
Artificial light has several effects on wildlife. Firstly, it attracts some organisms such as insects, frogs, and sea turtles, making them more susceptible to predation or exhaustion. It also repels some organisms, excluding them from their habitats. Additionally, artificial light alters day and night patterns, disrupting sleep and reproductive cycles. This can have detrimental effects on populations. For example, artificial lights near wetlands can disrupt the nocturnal croaking of frogs, which is part of their breeding ritual.
Light pollution also interferes with the migration of birds, often with fatal outcomes. For instance, U.S. Fish and Wildlife Service biologist Roger Tabor found that juvenile Chinook and sockeye salmon in Washington State's Lake Washington were drawn to patches of water lit by artificial lights, becoming easy prey for predators. Similarly, environmental biologist Travis Longcore studied the impact of light pollution on the western snowy plover, finding that these birds avoided roosting on beaches with artificial light brighter than a half-moon.
The increased use of LED lighting has exacerbated the problem, as it is now cheaper and easier to have brighter lights. However, individuals can make a difference by taking simple actions such as turning off unnecessary lights and changing light bulbs and fixtures to more nature-friendly options. Some countries, like France, Slovenia, and Croatia, have also implemented policies to limit light pollution.
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Light pollution's effects on human health
Light pollution, the human-made alteration of outdoor light levels from those occurring naturally, has been shown to have several negative effects on human health.
Firstly, light pollution can disrupt sleep patterns and cause sleep disorders. Research has found that brighter residential nighttime lighting is associated with reduced sleep times, dissatisfaction with sleep quality, excessive sleepiness, and impaired daytime functioning. This disruption to sleep is caused by the impact of artificial light on the body's production of melatonin, a hormone that plays a crucial role in regulating the body's biological clock.
Secondly, light pollution has been linked to an increased risk of obesity. The American Medical Association has estimated that white LED lamps have five times the impact on circadian sleep rhythms compared to conventional street lamps, and this disruption to sleep patterns can contribute to weight gain and obesity.
In addition, there is emerging evidence of a potential connection between light pollution and certain types of cancer. For example, studies have found a correlation between exposure to indoor artificial light at night and increased rates of breast cancer. Additionally, research on the connection between shift work and cancer has led to the classification of shift work as a probable human carcinogen. While the specific link between light pollution and cancer requires further investigation, the existing evidence suggests that artificial light exposure at night may increase the risk of cancer development.
Light pollution can also impact mental health and has been associated with an increased risk of depression. Furthermore, it can interfere with individuals' spiritual experiences and their connection to nature, which may have negative psychological effects.
While the specific laws addressing light pollution vary by location, there is a growing awareness of its negative impacts on human health, wildlife, and the environment. Some countries, such as France, Slovenia, and Croatia, have already implemented legislation to tackle this issue.
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Light pollution and energy waste
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It refers to the presence of unwanted, excessive, or inappropriate artificial lighting. This pollution is not only detrimental to human health and the environment but also results in significant energy wastage.
The adverse effects of light pollution on human health are well-documented. Artificial light at night (ALAN) has been linked to reduced melatonin production, leading to sleep deprivation, fatigue, headaches, stress, anxiety, and an increased risk of hormonal cancers. It also poses risks to wildlife, disrupting the natural rhythms of migrating birds, the feeding and reproduction patterns of animals, and the symbiosis critical to plant pollination and reproduction.
Light pollution is also a significant contributor to energy waste. In the US alone, it is estimated that at least 30% of all outdoor lighting is wasted, amounting to approximately 60 billion kilowatt-hours (kWh) and $6.3 billion in monetary losses annually. This wasted energy also results in the release of 21 million tons of carbon dioxide per year, contributing to climate change. The International Dark Sky Association attributes this waste to lighting that is used when not needed or directed upwards instead of downwards where it is required.
The growing popularity of LED lighting has exacerbated the issue, as homeowners and property managers rapidly increase outdoor light emissions under the false assumption that more light is better. However, this has led to excessive lighting that shines where it is not wanted or needed, contributing to light pollution and energy waste.
To address light pollution and energy waste, individuals, institutions, and governments should adopt nature-friendly outdoor lighting practices. This includes using lighting only when and where it is needed, ensuring lights are shielded and directed downwards, and installing quality lighting that reduces energy use and carbon emissions. By taking these actions, we can not only reduce light pollution but also conserve energy, mitigate climate change, and improve the well-being of humans and wildlife.
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Light pollution laws and regulations
While light pollution laws and regulations exist, they are often fragmented, inconsistent, and sometimes nonexistent. Civil law jurisdictions, like Shanghai and Seoul, have dedicated, metrics-based legislation that enables regulators to set clear limits on brightness, curfews, and repair schedules for outdoor fixtures. In contrast, common law jurisdictions, such as London and New York, rely on more flexible but weaker "bolt-on" regulations added to broader environmental or nuisance laws.
In the United States, most state laws focus on outdoor lighting fixtures installed on state-owned buildings, facilities, or public roadways. These laws often require the installation of shielded light fixtures that emit light downward, the use of low-glare or low-wattage lighting, and the regulation of lighting duration. Some states, like Arizona, have had light pollution laws since 1986, aiming to protect astronomy activities. Colorado's legislation considers costs, energy conservation, glare reduction, light pollution minimization, and preservation of the natural night environment.
Texas is unique in its focus on military installations, allowing counties with a certain number of military bases and population size to adopt measures governing outdoor lighting within five miles of a military base. Coastal states like Florida also consider the impact of lighting on avian and marine life, with Florida guiding local governments in developing policies to protect hatching sea turtles.
To address inconsistent regulations, organizations like DarkSky International have created templates for local, state, and territorial laws to promote responsible outdoor nighttime lighting. These templates are based on the Five Principles of Responsible Outdoor Lighting and aim to protect local character, enhance visual safety, and mitigate light pollution's harmful effects.
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Solutions to light pollution
Light pollution is a serious issue, impacting wildlife, human health, and the environment. It is caused by artificial light, which has been increasing by approximately 10% per year, and has various negative consequences. However, there are several solutions to this problem.
Firstly, individuals can make a difference by adopting simple habits such as turning off unnecessary lights, using window shades to block indoor light from escaping outdoors, and reducing the use of electronic devices at night. When using flashlights or headlights, it is advisable to point them downwards to minimise light pollution.
Secondly, communities can play a significant role in reducing light pollution by advocating for policy changes and adopting dark-sky-friendly lighting practices. This includes supporting the use of shielded fixtures, appropriate light bulbs, and energy-efficient lighting solutions like LEDs with warmer colour temperatures. Smart lighting systems with motion sensors and timers can also help minimise light pollution while optimising energy consumption.
Thirdly, education and awareness campaigns are essential. By informing the public about the harmful effects of light pollution on humans, wildlife, and the climate, individuals can be encouraged to adopt sustainable practices. This includes promoting the proper placement and design of lighting fixtures to minimise glare and over-illumination.
Additionally, legislative action is necessary to enforce maximum wattage limits and regulate the wavelengths emitted by public lighting. Lighting designers, policymakers, and stakeholders should collaborate to develop lighting standards that prioritise sustainability and responsible lighting practices.
Lastly, innovative lighting designs can be aesthetically pleasing and functional while adhering to dark-sky principles. This includes using reflective hoods over streetlights to reduce the amount of light escaping upwards.
By implementing these solutions, we can effectively address light pollution, protect our environment, and restore the beauty of our night skies.
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Frequently asked questions
Light pollution refers to artificial light that shines where it is not wanted or needed. There are three types of light pollution: Skyglow, glare, and light shining on private property. Skyglow is the pink or orange glow seen for miles around towns and cities, caused by artificial light reflecting off airborne dust and water droplets. Glare occurs when light shines directly into a person's eyes, sometimes temporarily blinding them. Light pollution also occurs when light from a neighbour's property shines onto someone else's private property.
Light pollution can have negative effects on both human health and the environment. It can interfere with the body's production of melatonin, a hormone that resets the body's biological clock. It can also disrupt sleep and cause fatigue, increased risk of cancer, and impairment of infant sleep cycles. Light pollution can also harm wildlife and ecosystems. It can confuse birds and sea turtles that depend on the night sky for navigation, causing them to veer off course and sometimes die. It can also interfere with reproductive functions and prevent trees from becoming dormant in winter, leading to their death.
Light pollution is recognised as a "'nuisance'" in most parts of the United States and some parts of the United Kingdom. However, the existence and enforcement of laws vary across different jurisdictions. While some cities like Shanghai and Seoul have strict limits on brightness and curfews, others like London and New York rely on outdated nuisance laws that place the burden of proof on those affected by the light pollution. There are ongoing campaigns and studies advocating for stronger national and local policies to address light pollution.
