Helena Joyce
Soil pollution is a significant and growing threat to human health, with an estimated 9 million deaths attributed to air, water, and soil pollution each year. Soil is foundational to human health, providing food, supporting ecosystems, and offering critical ecological services such as water filtration and carbon sequestration. However, soil pollution reduces soil fertility and crop yields, contaminates food and water sources, and directly exposes humans to harmful substances. Pollutants in the soil, such as heavy metals, pesticides, and plastic particles, can lead to the emergence of new pests and diseases, impacting food security and contributing to antimicrobial resistance. The accumulation of contaminants in the soil poses a risk to human health that needs to be addressed through sustainable practices and regulations to ensure a toxic-free environment for future generations.
| Characteristics | Values |
|---|---|
| Soil pollution sources | Chemicals, industrial activity byproducts, domestic/livestock/municipal waste, agrochemicals, petroleum products, pesticides, heavy metals, plastic waste, biological pathogens, pharmaceutical waste, air pollution |
| Human exposure routes | Contaminated drinking/bathing water, food grown in polluted soil, products from animals fed contaminated feedstuffs, airborne dust |
| Health effects | Cardiovascular disease, renal toxicity, osteoporosis, colorectal cancer, bladder cancer, breast cancer, thyroid disease, methemoglobinaemia, neural tube defects, pulmonary diseases, irritation of the respiratory tract, lung cancer |
| Impact on food security | Reduced crop yields, unsafe crops for human/animal consumption, reduced soil fertility |
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What You'll Learn
Food and water contamination
Soil pollution is a critical threat to human health and food security. It refers to the contamination of soil with abnormally high concentrations of toxic substances, which can have adverse effects on plant life and, subsequently, the food chain.
Soil is essential for growing crops, providing food, and sustaining populations. It is the medium in which nearly all food-producing crops grow, with about 95% of the food we eat coming from the soil. Soil pollution reduces the ability of the soil to yield food, leading to reduced crop production and unsafe food for human and animal consumption.
Soil may be polluted by heavy metals, organic chemicals such as pesticides, biological pathogens, and micro/nanoplastic particles. These pollutants can be carried by the wind, seep into underground water reserves, or be transported by precipitation, leading to air and water pollution. Soil pollutants can also wash into rivers, causing water pollution. This contaminated water is then used for irrigation, leading to the growth of crops in polluted soil, which are then consumed by humans and animals. For example, in China, over 12 million tons of grain were found to be unfit for human consumption due to heavy metal contamination.
The consumption of contaminated food and drinking water is a significant route of exposure to soil pollutants for humans. Food crops grown in polluted soil can accumulate high concentrations of soil pollutants through bioaccumulation. When these crops are consumed, the accumulated pollutants are passed up the food chain, leading to diseases in humans. For example, the ingestion of food contaminated with cadmium from polluted soils has been associated with an increased risk of postmenopausal breast cancer.
Soil pollution also affects soil fertility and biodiversity, which further jeopardizes food security. It reduces the number and variety of beneficial microorganisms in the soil, impacting the nutrient cycle and the ability of the soil to support plant growth. This, in turn, affects the availability of nutritious food for humans.
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Soil fertility and food security
Soil pollution reduces the number and variety of beneficial microorganisms in the soil through chemical toxicity. This toxicity is caused by pollutants such as pesticides, fertilisers, wastewaters, sewage sludge, heavy metals, and other natural and man-made chemical substances. These pollutants are released into the environment accidentally or intentionally. Accidental releases occur from oil spills or leaching from landfills, whereas intentional releases occur through the use of fertilisers and pesticides, irrigation with untreated wastewater, or land application of sewage sludge.
The use of fertilisers and pesticides is common in agricultural fields. While fertilisers are used extensively to increase plant production, unused nitrogen, usually in the form of nitrate, can leach out of the soil, enter streams and rivers, and ultimately make its way into drinking water. Pesticides, on the other hand, lower soil biodiversity and resilience and could lead to the contamination of food and feed.
Soil pollution affects soil fertility and food security in two main ways. Firstly, it can reduce crop yields due to toxic levels of contaminants. Secondly, crops grown in polluted soils are unsafe for consumption by animals and humans. Soil degradation, which is caused by soil pollution, poses a threat to food security as it reduces yield, forces farmers to use more inputs, and may eventually lead to soil abandonment.
To address the issue of soil pollution and its impact on soil fertility and food security, the European Environment Agency has set targets to reduce the use of chemical pesticides and hazardous pesticides by 50% by 2030. Additionally, the FAO's Revised World Soil Charter recommends that national governments implement regulations on soil pollution and limit the accumulation of contaminants to guarantee human health, wellbeing, a healthy environment, and safe food.
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Cardiovascular disease
Soil pollution is a critical threat to cardiovascular health, with pollutants such as heavy metals, pesticides, and plastics contaminating the soil and leading to adverse health outcomes. Soil degradation and contamination impact the health of approximately 3.2 billion people worldwide, and its effects on cardiovascular health are significant. Here are some key ways in which soil pollution contributes to cardiovascular disease:
Oxidative Stress and Inflammation:
Soil pollutants, including heavy metals, pesticides, and micro/nanoplastics, induce oxidative stress and inflammation in the body. Oxidative stress occurs when there is an imbalance between "bad" free radicals and "good" antioxidants in the blood vessels, leading to cellular damage and cardiovascular dysfunction. This process is further exacerbated by environmental stressors such as mental stress, noise exposure, and nocturnal light pollution. Inflammation, caused by the upregulation of pro-inflammatory cytokines and infiltration of immune cells, further contributes to the pathogenesis of cardiovascular disease.
Endothelial Dysfunction:
Exposure to chemical pollutants in the soil, such as heavy metals, solvents, dioxins, and pesticides, can lead to endothelial dysfunction. Endothelial cells line the inner surface of blood vessels, and their dysfunction is a key early event in the development of atherosclerosis and cardiovascular disease. Endothelial dysfunction impairs the endothelium's ability to regulate blood flow, maintain vascular tone, and prevent thrombosis, contributing to the development of cardiovascular disease.
Hormonal Imbalances and Circadian Rhythm Disturbances:
Soil pollution has been linked to hormonal imbalances and disturbances in circadian rhythms. Increased stress hormone release, including cortisol, adrenaline, and noradrenaline, can contribute to cardiovascular risk factors such as hypertension and metabolic disorders. Disturbances in circadian rhythms, or the body's internal clock, can also have adverse effects on cardiovascular health, including impaired cardiovascular function and increased risk of cardiovascular events.
Food Contamination and Malnutrition:
Soil pollution diminishes the soil's capacity to produce healthy food. Contaminants in the soil can lead to crop impurities, malnutrition, and the consumption of toxic substances. Pesticides, heavy metals, and other pollutants can accumulate in fruits, vegetables, and meat, leading to increased exposure to these harmful substances. Additionally, soil pollutants can seep into rivers and other water sources, further contaminating the food chain and exacerbating water pollution.
Globalisation of Food Supply Chains:
Soil pollution with heavy metals and other contaminants is particularly problematic in low- and middle-income countries, where populations may be disproportionately exposed to these pollutants. However, with the increasing globalisation of food supply chains, the consumption of contaminated food products can affect any country. The uptake of heavy metals and other pollutants through fruits, vegetables, and meat produced in polluted regions can contribute to cardiovascular disease globally.
Overall, soil pollution is a significant contributor to cardiovascular disease, and its impact on human health cannot be overlooked. Addressing soil pollution through sustainable land-use practices, stricter pollution controls, and public health initiatives is crucial to reducing the burden of cardiovascular disease worldwide.
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Heavy metal and chemical toxins
Soil pollution by heavy metals and chemical toxins is a critical environmental concern that poses a serious threat to human health and agricultural production. Heavy metals are considered a natural part of the soil; however, they become toxicants when present in high concentrations. These high concentrations of heavy metals in agricultural soils pose a significant risk to plant life, human health, and the global food supply.
Heavy metals, such as cadmium, lead, arsenic, mercury, chromium, copper, nickel, and zinc, can accumulate in the soil due to both natural and anthropogenic sources. Natural sources include sedimentary rocks, volcanic eruptions, soil formation, and rock weathering, while anthropogenic sources include industrial activities, agriculture, mining, and domestic effluents. The use of chemical fertilizers, pesticides, livestock manures, and sewage sludge-based biosolids in agriculture can also contribute to heavy metal contamination in soils.
The presence of heavy metals in the soil can damage plants and alter soil characteristics, leading to reduced crop yield. These metals can interfere with the normal structure and function of cellular components, disrupting various metabolic and developmental processes in plants. When plants are affected by heavy metals, the consumption of these contaminated plant products can expose humans to numerous serious diseases. Certain metals, such as cadmium and lead, can cause damage to various organs, including the kidneys, brain, intestines, lungs, and liver. Additionally, heavy metals can enter the food chain, further impacting human health.
The contamination of soil and groundwater by toxic metals is a growing concern due to urbanization and industrialization, which have increased solid waste generation. The leakage of leachate from landfills can contaminate the soil, leading to severe consequences for human health and the environment. To address this issue, government agencies should implement new technologies to remove these metals from landfills and prevent their discharge into the soil and water.
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Land degradation
Soil pollution is defined as the contamination of soil by waste materials of human origin, which have adverse effects on human and ecosystem health. Land degradation occurs naturally, but human activities have exacerbated it. Urban expansion, deforestation, industrial agriculture, overgrazing, and unsustainable farming practices have accelerated land degradation over the past few decades.
Poor farming practices, such as monocropping, inefficient irrigation, and the excessive use of chemical fertilizers and pesticides, can degrade soil health and lead to environmental pollution. Overgrazing depletes vegetation cover and increases ground compaction, contributing to soil erosion. Aggressive cultivation practices like deep plowing and heavy tillage weaken the soil structure. The misuse of fertilizers can affect beneficial organisms and pollute the land through nutrient imbalances and acidification.
Industrial and mining activities introduce toxic pollutants and heavy metals into the soil, rendering it unfit for agriculture or ecological purposes. Soil contamination poses a significant risk to human health, as pollutants can enter the food chain and accumulate in the body, leading to adverse health effects. Contaminated sites, agricultural and urban soils, and previously flooded lands are hotspots for human exposure to soil pollution.
Soil degradation has far-reaching consequences, including landslides, flooding, desertification, and a drop in global food production. It also affects water quality, as polluted soil can contaminate water sources, impacting both ecological and human health. The loss of topsoil due to degradation removes a natural filter for sediment and pollutants, allowing fertilizers, pesticides, and heavy metals to enter water bodies.
Climate change, air pollution, and species extinction, along with soil pollution, pose an existential threat to the sustainability of human societies. Soil degradation impacts agricultural productivity and human well-being, and it is essential to address these issues through sustainable land management approaches before they become irreversible.
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Frequently asked questions
Soil pollution is the contamination of soil by waste materials of human origin, including heavy metals, toxic organic chemicals, pesticides, biological pathogens, and plastic waste.
Soil pollution can affect human health in both direct and indirect ways. Directly, people can be exposed to contaminated soil through airborne dust, which can cause irritation of the respiratory tract and increase the risk of pulmonary diseases. Indirectly, people may be exposed to soil pollutants through contaminated drinking water, bathing water, or food grown in polluted soils. This can lead to adverse health effects, including renal toxicity and osteoporosis, and an increased risk of cardiovascular disease and cancer.
To reduce the health risks associated with soil pollution, it is important to implement regulations and improve soil management practices to limit agricultural and industrial pollution. The zero pollution action plan aims to reduce the use of chemical pesticides and hazardous pesticides, which are significant contributors to soil pollution. Additionally, national governments should follow recommendations such as the FAO's Revised World Soil Charter, which calls for regulations on soil pollution and the accumulation of contaminants to protect human health and wellbeing.
