Kiera Jefferson
Pollution is the introduction of harmful substances into the environment. While pollution can be caused by natural events, the word generally implies that the source is human activity. Human-made pollution can come from manufacturing, extractive industries, poor waste management, transportation, and agriculture. Air pollution, caused by vehicle emissions, fuel oils, natural gas, and by-products of manufacturing, is a major threat to global health. It is responsible for more than 6.5 million deaths each year, a number that has increased over the past two decades. In addition to air pollution, humans also contribute to water, soil, and noise pollution, as well as plastic pollution, which has a detrimental impact on wildlife, habitats, and humans. Many everyday habits, such as leaving the tap running, drinking bottled water, or using aerosol deodorants, also contribute to environmental pollution.
| Characteristics | Values |
|---|---|
| Number of deaths caused by air pollution each year | 6.5 million |
| Number of deaths caused by air pollution each year (WHO estimate) | 7 million |
| Percentage of global population breathing air that exceeds WHO guideline limits | 99% |
| Percentage of people breathing air containing high levels of pollutants | 90% |
| Sources of human-made air pollution | Vehicle emissions, fuel oils, natural gas, manufacturing by-products, power generation, chemical production |
| Sources of natural air pollution | Wildfires, volcanic eruptions, gases from decomposing organic matter |
| Common sources of air pollution | Household combustion devices, motor vehicles, industrial facilities, forest fires |
| Pollutants of major public health concern | Particulate matter, carbon monoxide, ozone, nitrogen dioxide, sulfur dioxide |
| Health issues caused by air pollution | Respiratory and other diseases |
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What You'll Learn
Manufacturing, extractive industries, and waste management
Human activity has had a profound impact on the environment, with manufacturing, extractive industries, and waste management being key contributors to pollution.
Manufacturing
The manufacturing sector is a significant source of pollution, particularly in the form of greenhouse gas emissions. When producing goods, this sector emits carbon dioxide and other greenhouse gases that contribute to global warming, both by burning fossil fuels and through certain industrial processes. The chemical and refining industries are the largest emitters within the manufacturing sector. Historically, there have been fewer policies targeting greenhouse gas emissions from manufacturing compared to other sectors like transportation and electric power. However, policies like the Clean Air Act aim to regulate pollutants such as particulate matter and ozone emitted by the manufacturing industry.
Extractive Industries
Mining and oil drilling, which fall under extractive industries, have transformed landscapes and polluted the air and water worldwide. The environmental impact of these industries has been particularly notable in the Global South, where their presence has intensified since 1950. Extractive industries have faced protests and scrutiny due to their contribution to environmental degradation and inequality in African, Asian, and Latin American localities.
Waste Management
Poor waste management practices pose serious risks to ecosystems and human health. The increasing volume and complexity of waste in the modern economy have led to air, water, and soil contamination. Open and unsanitary landfills contribute to drinking water contamination and the spread of diseases. Electronic waste, or e-waste, is a growing concern, as it contains hazardous substances that can pollute ecosystems and harm human health. Proper waste management, including waste reduction, recovery, recycling, and remanufacturing, is essential to mitigate these issues. The UNEP International Environmental Technology Centre (IETC) in Japan supports the implementation of integrated solid waste management systems, particularly for special wastes like electronics and plastics.
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Transportation and agricultural emissions
The transportation sector is a major contributor to pollution, particularly in the form of greenhouse gas emissions. In 2022, transportation accounted for 28-29% of total US greenhouse gas emissions, making it the largest or third-largest contributor depending on whether direct or indirect emissions are included. The burning of fossil fuels for cars, trucks, ships, trains, and planes is the primary source of these emissions. Over 94% of the fuel used in transportation is petroleum-based, including gasoline and diesel, which release carbon dioxide (CO2) when combusted in internal combustion engines. Passenger cars, medium- and heavy-duty trucks, and light-duty trucks, including SUVs, pickup trucks, and minivans, are the largest sources of transportation-related emissions, accounting for over half of the sector's total. Other modes of transportation, such as commercial aircraft, ships, boats, trains, and pipelines, also contribute. Additionally, small amounts of methane (CH4) and nitrous oxide (N2O) are emitted during fuel combustion, and hydrofluorocarbon (HFC) emissions result from the use of mobile air conditioners and refrigerated transport.
Agricultural activities, including crop and livestock production, are another significant source of pollution. In 2022, the agricultural sector accounted for 9.4-11% of total US greenhouse gas emissions. Management of agricultural soils accounts for just over half of the sector's emissions, with specific activities such as the application of synthetic and organic fertilizers, drainage of organic soils, and the growth of nitrogen-fixing crops leading to increased emissions of nitrous oxide (N2O). Livestock, especially ruminants like cattle, also contribute to emissions through their digestive processes, which produce methane (CH4) as a byproduct, known as enteric fermentation. This represents over a quarter of the agricultural sector's emissions. The management of livestock manure further contributes to CH4 and N2O emissions, with different treatment and storage methods affecting the amount produced. Smaller sources of agricultural emissions include CO2 from liming and urea application, CH4 from rice cultivation, and burning crop residues, which produce a mixture of CH4 and N2O.
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Everyday habits like using deodorants, bottled water, and chewing gum
Human activities have significantly contributed to environmental pollution, and everyday habits like using deodorants, bottled water, and chewing gum are no exception.
Deodorants, for instance, have a notable impact on the environment. Spray deodorants and antiperspirants release chemicals into the air, including volatile organic compounds (VOCs) that contribute to the formation of smog, a major atmospheric pollutant. Additionally, the packaging of deodorants often utilizes non-recyclable or non-degradable materials, such as plastic and tin, leading to excessive waste that pollutes the environment. Some deodorants also contain antibacterial chemicals like triclosan, which can contribute to water pollution.
Bottled water consumption has become a common part of daily life, but it has severe ecological consequences. Plastic water bottles contribute to ocean pollution, as plastic waste breaks down into microplastics, which are ingested by marine organisms, disrupting the food chain and biodiversity. The production and transport of plastic bottles also generate significant greenhouse gas emissions, and the manufacturing process requires large quantities of water and fossil fuels, mainly oil. Recycling plastic bottles is challenging and often insufficient, as it involves complex and costly processes that can involve toxic chemicals, ultimately impacting the environment and human health.
Chewing gum is another everyday habit that contributes to plastic pollution. Most chewing gum is made from oil-based synthetic rubbers, similar to the plastic material in car tires. This synthetic gum does not biodegrade and can persist in the environment for many years, breaking down into microplastics over time. The cleanup process for discarded gum is labor-intensive and expensive, and it affects various surfaces, from street pavements to school desks.
These seemingly harmless everyday habits have far-reaching environmental implications, underscoring the need for awareness and responsible consumption choices to mitigate pollution and protect our planet.
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Cigarette butts, wipes, helium balloons, and batteries
Human activities are a major cause of pollution, from agricultural practices to vehicle emissions, and industrial processes. One of the most significant contributors to pollution is the manufacturing industry, which releases hazardous substances and toxic fumes into the environment.
Cigarette Butts
Cigarette butts are the most common form of plastic pollution in the world. They consist primarily of plastic and contain hundreds of toxic chemicals. These butts can take up to 10 years to degrade, and the chemicals they release can remain in the environment for much longer. Cigarette filters are made of cellulose acetate, a man-made plastic material. Cigarette butt pollution disproportionately affects low-income communities of colour, which have higher smoking rates due to targeted marketing by the tobacco industry and inequitable waste management services. Tobacco farming also contributes to global deforestation, with 200,000 hectares of wood biomass lost per year.
Wipes
Wet wipes are among the single-use plastic items most commonly found on beaches and in waterways in the EU. They do not disintegrate completely and cause obstructions in sewer systems, increasing the risk of overflows. The microfibres from wet wipes end up in rivers and other bodies of water, leading to environmental fines and costly cleanup operations.
Helium Balloons
Helium balloons also contribute to pollution. When released, they can travel long distances and pose hazards to aircraft and the electrical grid. Mylar balloons can cause power outages and fires when entangled in power lines, while latex balloons can persist in the environment for up to four years. Legislation in some places is considering banning the intentional release of balloons.
Batteries
The manufacturing of batteries, particularly those for electric vehicles (EVs), has an environmental impact due to the toxic fumes released during the mining of materials and the water-intensive nature of the process. Lithium mining, for example, has resulted in toxic chemical leaks and water pollution. While EVs aim to reduce emissions, the environmental impact of battery production is still debated, especially when considering the energy sources used to power the batteries.
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Electromagnetic, light, noise, and plastic pollution
Human activities are the primary cause of pollution, including electromagnetic, light, noise, and plastic pollution. Electromagnetic pollution is caused by power lines and electrical appliances that emit electromagnetic fields (EMFs). While there is no direct mechanism by which EMFs can cause cancer, some studies suggest they may do so through other means, such as by reducing melatonin levels. Research has also indicated an increased risk of brain cancer among those exposed to microwave and radiofrequency radiation.
Light pollution, caused by streetlights, offices, and advertising, among other sources, has resulted in a brightened night sky, particularly in urban areas. This has disrupted the natural body rhythms of humans and animals, impacting sleep and migration patterns. It has also affected astronomers' ability to observe celestial objects.
Noise pollution, from sources like traffic, construction, and concerts, can cause hearing loss, stress, and high blood pressure in people. It also impacts wildlife, affecting the heart rates of caterpillars and the breeding patterns of bluebirds. In the ocean, noise from ships and human activities harms whales and dolphins that rely on echolocation.
Plastic pollution is a significant global issue, with approximately 19-23 million tonnes of plastic waste entering aquatic ecosystems annually. Plastic fills our oceans, alters habitats, and affects the livelihoods of millions, as well as food production and social well-being. Thus, human activities have led to various forms of pollution, impacting both the environment and human health.
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Frequently asked questions
Manufacturing activities contribute to air pollution, which imposes health and clean-up costs on society. For example, the production of iron, steel, and rubber products, as well as power generation, release polycyclic aromatic hydrocarbons (PAH), which are organic compounds containing carbon and hydrogen.
Some everyday habits that contribute to pollution include leaving the tap running, using bottled water, and littering, such as throwing chewing gum on the ground or leaving cigarette butts on the beach. These habits can have negative consequences for the environment and wildlife.
Pollution can have significant impacts on both humans and the environment. It can lead to various health issues, including respiratory and cardiovascular diseases, and can even cause premature death. Pollution also endangers the stability of the Earth's support systems, such as climate change and rising sea levels, threatening the survival of human societies.
