Meghan Hodges
Pollution is the environmental issue caused by the addition of harmful substances to the environment at a rate faster than they can be dispersed or diluted. The major kinds of pollution are air, water, and land pollution, but modern society is also concerned about noise, light, and plastic pollution. Pollution has been a problem since the establishment of permanent human settlements, but it has become a universal issue with industrialization and unprecedented population growth. Pollution poses serious health risks, causing debilitating and fatal illnesses, and it undermines sustainable economic growth, exacerbates poverty and inequality, and significantly contributes to climate change.
| Characteristics | Values |
|---|---|
| Environmental cause of disease and premature death | It is estimated to cause several times more deaths than AIDS, tuberculosis, and malaria combined. Outdoor air pollution alone kills roughly 5.7 million people globally each year. |
| Economic burden | The economic burden of pollution associated with premature mortality and morbidity is equivalent to 5 to 14 percent of countries' GDPs. |
| Affects low- and middle-income countries the most | More than 90% of deaths caused by air pollution occur in low- and middle-income countries. |
| Root causes | The dominant "take, make, waste" linear economy, fueled by large amounts of cheap, accessible energy and other resources, and producing goods that are designed to be disposable. |
| Plastic pollution | The problem of plastic pollution on land and in the oceans has grown as the use of single-use plastics has increased worldwide. |
| Greenhouse gas emissions | Greenhouse gas emissions, such as methane and carbon dioxide, drive global warming and pose a threat to biodiversity and public health. |
| Affects children's health | Children are more likely to develop asthma and bronchitis symptoms in adulthood when exposed to air pollution. It also affects their brain development, increasing the risk of cognitive and emotional problems. |
| Affects wildlife | Pollution can hurt trees and wildlife, and destroy ecosystems. |
| Affects water bodies | Water pollution affects marine life and drinking water sources. |
| Affects climate change | Pollution significantly contributes to climate change. |
| Affects the economy | Pollution undermines sustainable economic growth and exacerbates poverty and inequality. |
| Affects mental health | Air pollution can increase the risk of anxiety and depression. |
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What You'll Learn
Air pollution and health
Air pollution is the leading environmental risk to health, causing around 4.2 million premature deaths each year. The health impact of air pollution exposure depends on the duration and concentrations of exposure and the health status of the affected populations.
Air pollution is a complex mixture of solid and liquid particles and gases in the air we breathe. These particles are often too small to be visible, but when pollution levels are high, they can make the air appear thick and hazy. Sources of particle pollution include motor vehicles, factories, power plants, equipment, wood burning, and wildfires.
When inhaled, these particles can penetrate deep into the lungs and even enter the bloodstream, travelling to other organs in the body. This can cause a range of acute and chronic health issues, including asthma, strokes, heart attacks, lung cancer, and dementia. Particle pollution is particularly dangerous for children, the elderly, and people with pre-existing health conditions, especially heart and lung disease. Low-income communities and minority populations are also disproportionately exposed to air pollution and are more vulnerable to its adverse health effects.
Ozone, a powerful lung irritant, is another common air pollutant. When inhaled, it damages the delicate lining of the small airways, causing inflammation and impacting multiple body systems. High ozone levels can cause breathing problems such as chest tightness, coughing, and shortness of breath, even in otherwise healthy young adults.
Addressing air pollution is crucial not only for public health but also for the economy. The World Bank estimates that the health damage caused by air pollution costs $8.1 trillion a year, equivalent to 6.1% of global GDP. By improving air quality, we can reduce the burden of disease, enhance productivity, and promote sustainable economic growth.
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Water pollution
The use of water in various industries also contributes to pollution. For example, rainwater can wash oil, grease, road salt, debris, and chemicals into waterways, and the shipping industry is a significant source of oil pollution. Additionally, wastewater from toilets, sinks, and showers, as well as commercial, agricultural, and industrial processes, can contain harmful substances that contaminate water sources. Plastic pollution is another pressing issue, with microplastics found in marine wildlife and the potential for biomagnification in humans who consume seafood.
The impact of water pollution on human health is significant. Contaminated water sources can lead to infections, cancer, and cardiovascular conditions, among other health issues. According to the United Nations, 2.2 billion people lacked access to safe drinking water services in 2022, and over 2 billion people live in countries with high levels of water stress. Unsafe water kills more people each year than war and all other forms of violence combined.
Addressing water pollution requires governmental policies and regulations, as well as changes in consumer behavior. The circular economy approach, which promotes restorative and regenerative practices in industrial and natural resource-based production systems, is one solution that aims to tackle the root causes of pollution. Additionally, analytical work and environmental priorities identified through studies can inform investments, policy reforms, and capacity-building interventions to address water pollution and protect this vital resource.
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Land pollution
Causes of Land Pollution
The primary cause of land pollution is human activity, particularly industrialisation and agricultural practices. The growth of industry increases the demand for natural resources and intensifies food production, which leads to unsustainable agricultural practices. For example, the heavy use of fertilisers and farmed animal waste degrades the soil, impacting its ability to retain moisture and increasing the likelihood of fires. Furthermore, pollutants from growing crops and raising livestock—such as chemicals, pesticides, bacteria, and waste—contaminate both water and soil.
Urbanisation and construction are also major contributors to land pollution. Large amounts of waste are produced in urban areas, and without proper disposal, materials such as metal, wood, plastic, and bricks can have harmful environmental effects. Mining is another common cause, as the extraction of minerals depletes natural resources and often causes pollution and damage to the earth.
Effects of Land Pollution
Additionally, land pollution results in biodiversity loss, the destruction of natural habitats, and the disruption of entire ecosystems. It also affects soil permeability, or the ability of the soil to absorb materials. Highly permeable soil is more vulnerable to absorbing pollutants such as toxic chemicals, hazardous waste, plastic, trash, oil, sewage, and pesticides.
Solutions
To address land pollution, it is essential to tackle the root causes, which lie in the dominant "take, make, waste" linear economy. A circular economy, where industrial and natural resource-based production systems are restorative and regenerative, offers a more sustainable alternative. Implementing sustainable practices, such as reducing intensive material consumption and promoting recycling, can help alleviate the problem of land pollution and protect the health and well-being of all living beings.
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Plastic pollution
The problem of plastic pollution on land and in the oceans has grown as the use of single-use plastics has increased worldwide. Single-use plastics account for 40% of the plastic produced every year, with a lifespan of minutes to hours, yet they may persist in the environment for hundreds of years. Many of these products are not deposited in containers for subsequent removal to landfills, recycling centres, or incinerators. Instead, they are improperly disposed of and immediately begin to pollute the environment.
The first synthetic plastic, Bakelite, was produced in 1907, marking the beginning of the global plastics industry. However, rapid growth in global plastic production did not occur until the 1950s. In the last two decades, global plastic production has doubled, with half of all plastics ever manufactured being made in the last 20 years. This has led to landscapes littered by plastic packaging, which has become a common sight in many parts of the world.
The impact of plastic pollution is felt most acutely in developing Asian and African nations, where garbage collection systems are often inefficient or non-existent. However, the developed world, especially countries with low recycling rates, also struggles to properly collect discarded plastics. Plastic waste is an environmental pollutant, and when it is mismanaged, it becomes a significant issue. Mismanaged waste tends to be much higher in low-to-middle-income countries due to poorer waste management infrastructure.
To reduce plastic pollution, many scientists and conservationists advocate for improved waste management systems, better recycling practices, product design changes, and a reduction in the manufacturing of single-use plastics. Consumers can also play a role by cutting back on single-use plastics, opting for reusable alternatives, and ensuring effective recycling practices.
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Pollution control
Pollution is the largest environmental cause of disease and premature death. It is estimated to cause several times more deaths than AIDS, tuberculosis, and malaria combined. It poses serious health risks, particularly in low- and middle-income countries, where more than 90% of pollution-related deaths occur.
The major kinds of pollution are air, water, and land pollution, with modern society also concerned about noise, light, and plastic pollution. Pollution control aims to limit the release of harmful substances into the environment and involves air pollution control, wastewater treatment, solid-waste management, hazardous-waste management, and recycling.
To prevent pollution, it is crucial to address its root causes, which lie in the linear economy of "take, make, waste." A circular economy promotes regenerative and restorative production systems, sustainable chemistry, resource efficiency, and sustainable markets. Pollution prevention (P2) is any practice that reduces, eliminates, or prevents pollution at its source, such as source reduction, which is more cost-effective and environmentally beneficial than recycling, treatment, or disposal.
At the individual level, people can contribute to pollution control by reducing air pollution from vehicles, avoiding idling engines, limiting backyard fires, and using energy-efficient appliances. Additionally, communities can work together to advocate for clean air, educate locals, and promote sustainable practices.
On a broader scale, pollution control requires social decisions and international cooperation. Political and social pressures, as well as economic concerns, play a role in the implementation of pollution control measures. Developing countries, for instance, may prioritise economic development over pollution control, highlighting the need for global agreements on standards and practices.
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Frequently asked questions
Pollution is the addition of any substance (solid, liquid, or gas) or any form of energy (such as heat, sound, or radioactivity) to the environment at a rate faster than it can be dispersed, diluted, decomposed, recycled, or stored in some harmless form.
The major kinds of pollution are air, water, and land pollution. Modern society is also concerned about specific types of pollutants, such as noise pollution, light pollution, and plastic pollution.
Pollution is the largest environmental cause of disease and premature death. It causes debilitating and fatal illnesses, creates harmful living conditions, and destroys ecosystems. Air pollution can irritate the lungs and respiratory system, trigger asthma attacks, and cause the onset of asthma. It has also been linked to strokes, heart attacks, and dementia.
Solutions to pollution include clean-up efforts, air pollution control, wastewater treatment, solid-waste management, hazardous-waste management, and recycling. The Bank is promoting a circular economy, sustainable chemistry, resource efficiency, and sustainable markets in various sectors. Policies that support sustainable land use, cleaner household energy, and better municipal waste management can also help reduce ambient air pollution.
