Helena Joyce
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. Awareness of the harmful effects of light pollution began in the second half of the 19th century, but efforts to address its effects did not begin until the 1950s. The problem of light pollution was first raised in the 1930s by the international astronomical community, which considered light pollution to be the negative effect on astronomical observations caused by the brightening of the sky due to outdoor lighting in cities. Today, light pollution is increasing worldwide, with the highest increases in North America, and it is estimated that 83% of people, including 99% of Europeans and Americans, live under light-polluted skies.
| Characteristics | Values |
|---|---|
| Date of discovery | The 1930s |
| Discovered by | The international astronomical community |
| First named | "Interference light" in the UK and US, and "light pollution" in Japan |
| Awareness of harmful effects | Second half of the 19th century |
| Efforts to address effects | 1950s |
| Current level of light pollution | 83% of the world's people live under light-polluted skies |
| 23% of the world's land area is affected by skyglow | |
| 80% of North Americans cannot see the Milky Way | |
| 30% of people worldwide cannot see the Milky Way | |
| Solutions | Adjusting light fixtures |
| Using more appropriate light bulbs | |
| Educating the public | |
| Legislative change |
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What You'll Learn
Light pollution's impact on human health
Light pollution, a major side effect of urbanisation, is the presence of any unwanted, inappropriate, or excessive artificial lighting. It is caused by the inefficient or unnecessary use of artificial light, and it affects 83% of the world's population, including 99% of Europeans and Americans.
Light pollution has been found to have adverse effects on human health, with research suggesting that exposure to artificial light at night can negatively impact human health in several ways. Firstly, it can interfere with the production of melatonin, a hormone that is released in the dark and inhibited in the presence of light. Reduced melatonin levels have been linked to an increased risk of cancer, sleep deprivation, fatigue, headaches, stress, and anxiety.
Secondly, light pollution can disrupt the circadian rhythm, the internal 24-hour clock that guides daily activities and physiological processes. This disruption can lead to reduced sleep times, dissatisfaction with sleep quality, excessive sleepiness, and impaired daytime functioning, and an increased risk of obesity.
Additionally, light pollution has been associated with an increased risk of depression, diabetes, and breast cancer. It is also believed to have complex correlations with Alzheimer's disease, although further studies are needed to fully understand this relationship.
The awareness of the harmful effects of light pollution began in the second half of the 19th century, but efforts to address these issues did not gain momentum until the 1950s. Today, organisations like the International Dark Sky Association and DarkSky International are working to reduce light pollution and protect communities and wildlife.
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Light pollution's effect on wildlife
Light pollution, caused by the inefficient or unnecessary use of artificial light, has been known about since the second half of the 19th century. However, efforts to address the issue did not begin until the 1950s. Today, light pollution affects 83% of the world's population and 23% of the world's land area.
The impact of light pollution on wildlife is significant and wide-ranging. It affects the behaviour of many creatures, including amphibians, birds, mammals, insects, and plants. Nocturnal animals, which are active at night, are particularly vulnerable as their natural environment is drastically altered. Predators use light to hunt, and prey species use darkness as cover. Light pollution can also disrupt the breeding, feeding, and predator avoidance behaviours of many species. For example, artificial light has been found to alter nest-hiding behaviour and calling in frogs, affecting their breeding success.
Light pollution can also attract or repel certain organisms, leading to habitat loss and changes in food sources. Moths, for instance, are famously drawn to artificial lights, and this can result in their exhaustion and death. Similarly, migratory birds can be attracted to lights, causing them to lose their way and die from exhaustion or collision with the light source. Sea turtles and bats are also affected by light pollution, which can alter their migration and feeding habits.
Light pollution can extend the day for diurnal species, making them more susceptible to predators and causing early breeding. It can also impact the circadian rhythm of some mammals, extending the day for diurnal species and shortening the night for nocturnal species. This disruption to the natural rhythm of day and night can have far-reaching consequences for the health and survival of many species.
Some solutions to reduce the impact of light pollution on wildlife include carefully evaluating the need for outdoor lighting, reducing light spillage into wildlife habitats, and using dimmer or shielded lights. Turning off unnecessary lights can also immediately reduce the presence of this pollutant in the environment.
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Light pollution's influence on the environment
Light pollution, a phenomenon that has been observed since the second half of the 19th century, refers to the presence of any unwanted, excessive, or inappropriate artificial lighting. It is a side effect of industrial civilization, with sources including building exterior and interior lighting, advertising, outdoor area lighting, offices, factories, streetlights, and illuminated sporting venues.
Light pollution has a significant influence on the environment, disrupting the natural rhythms and behaviours of both humans and wildlife. The excessive use of artificial light at night competes with the natural darkness, disrupting the circadian rhythm of humans and animals. This internal, twenty-four-hour clock guides day and night activities and affects physiological processes, including the production of the hormone melatonin, which is inhibited in the presence of light. As a result, individuals may experience sleep deprivation, fatigue, headaches, stress, anxiety, and other health problems.
For nocturnal animals, light pollution radically alters their environment, turning night into day. Predators that hunt using light are affected, as are prey species that rely on the cover of darkness. Research scientist Christopher Kyba notes that near cities, cloudy skies are now hundreds or even thousands of times brighter than they were 200 years ago, significantly impacting nocturnal ecology. Additionally, artificial lights can disrupt the breeding rituals of amphibians in wetland habitats, reducing their populations.
Light pollution also affects bird migration, with lights on tall structures disorienting migrating birds. The U.S. Fish and Wildlife Service estimates that lights on tall towers contribute to the deaths of millions of birds each year. Furthermore, a 2009 study found that artificial light, particularly polarized light, can trigger maladaptive behaviours in polarization-sensitive taxa, negatively impacting animals and ecosystems.
Light pollution also disrupts ecosystems and spoils aesthetic environments. It interferes with the observation of stars and celestial objects, impacting astronomers and enthusiasts alike. More than 80% of the world's population, and 99% of Americans and Europeans, live under light-polluted skies, with only the most remote regions like Siberia, the Sahara, and the Amazon remaining in total darkness.
Addressing light pollution requires political, social, and economic considerations due to its man-made nature. However, simple solutions like adjusting light fixtures or using appropriate light bulbs can help reduce its adverse effects. Organizations like DarkSky International and the International Dark Sky Association are actively working to protect communities, conserve starry skies, and educate the public about the impacts of light pollution.
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The history of light pollution
Light pollution is a human-made alteration of outdoor light levels from those occurring naturally. It is caused by the inefficient or unnecessary use of artificial light. The term is most commonly used in relation to outdoor environments and surroundings, but is also used to refer to artificial light indoors. Light pollution competes with starlight in the night sky, interferes with astronomical observatories, disrupts ecosystems, and has adverse health effects on humans and wildlife.
In the second half of the 19th century, awareness of the harmful effects of light pollution began to emerge, but efforts to address these issues did not begin until the 1950s. During this time, the excessive use of artificial lighting became more prevalent, and the night skies in cities started to become noticeably brighter. The stars began to be drowned out, and people living in cities started to lose their connection to the dark sky and the Milky Way.
As technology advanced, the sources of light pollution diversified and intensified. The introduction of gas lighting in the late 18th and early 19th centuries, followed by the development of electric light bulbs in the late 19th century, contributed to the increasing levels of light pollution. The industrialization and urbanization of societies led to more lighting in buildings, factories, streetlights, and illuminated sporting venues.
Today, light pollution continues to be a significant issue, with 83% of the world's people living under light-polluted skies. The adverse effects of light pollution on human health, wildlife, and the environment are becoming more widely recognized. Organizations such as DarkSky International and the International Dark-Sky Association are dedicated to fighting light pollution, advocating for proper lighting practices, and educating the public about the harmful effects of excessive artificial lighting.
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Solutions to light pollution
Light pollution, which has been increasing by about 10% per year, is a human-made alteration of outdoor light levels from those occurring naturally. It has harmful effects on human health, wildlife, and ecosystems.
Legislation and Policy Changes
Citizens can band together to enact local legislation and advocate for light pollution reduction. This can include passing lighting ordinances that limit brightness and colour intensity, requiring cutoff lights to reduce glare, and implementing directed lighting that shines downward to minimise skyglow and light trespass.
Energy-Efficient Lighting
Switching to energy-efficient lighting sources, such as warm-coloured LED lights, can significantly reduce energy consumption and costs. LED lights have a longer lifespan and use less energy, making them a more sustainable option for public lighting in parks, streets, and buildings.
Proper Placement and Design of Lighting Fixtures
The placement and design of lighting fixtures play a crucial role in reducing light pollution. Communities should prioritise the design and placement of lighting fixtures to minimise glare, over-illumination, and light trespass. This can be achieved by using fixtures that direct light downward and implementing lighting standards that prioritise sustainability and responsible lighting practices.
Education and Awareness Campaigns
Education and awareness campaigns can promote responsible and sustainable lighting practices among the general public. By raising awareness about the negative impacts of light pollution and providing information on sustainable lighting practices, individuals can be encouraged to take action and adopt energy-efficient lighting technologies.
Reducing Light Usage
Individuals can contribute by reducing their light usage, such as turning off lights when not in use, using window shades to prevent light from escaping outdoors, and minimising the use of devices with bright screens after dark.
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Frequently asked questions
The problem of light pollution was first raised in the 1930s by the international astronomical community, which considered light pollution to be the negative effect on astronomical observations caused by the brightening of the sky due to outdoor lighting in cities.
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It is caused by inefficient or unnecessary use of artificial light.
Light pollution competes with starlight in the night sky, interferes with astronomical observatories, disrupts ecosystems, and has adverse health effects on humans and wildlife.
Light pollution is increasing all around the world, with the highest increases in North America. About 83% of people, including 99% of Europeans and Americans, live under light-polluted skies.
