Brian Barton
Soil pollution is a significant threat to human health, with pollutants accumulating in the soil above critical thresholds. People can be exposed to soil pollutants through contaminated drinking water, food grown in polluted soil, or products from animals fed contaminated feedstuffs. While there are no specific figures for deaths caused by land or soil pollution, the World Health Organization (WHO) estimates that unhealthy environments, including soil pollution, contribute to approximately 12.6 million deaths annually. This includes 1.7 million children under five and 4.9 million adults aged 50 to 75, whose deaths could be prevented through better environmental management.
| Characteristics | Values |
|---|---|
| Percentage of global deaths caused by environmental factors | 23% (28% for children under 4) |
| Countries with more than 30% of deaths attributable to an unhealthy environment | India, People's Republic of China, Lao People's Democratic Republic, Democratic People's Republic of Korea |
| Number of premature deaths caused by human exposure to soil pollution | 500,000+ per year |
| Percentage of the global population affected by soil-transmitted helminths | 24% |
| Percentage of the world's population that gets ill from eating contaminated food | 10% |
| Number of people who die annually from diseases caused by contaminated food | 420,000 |
| Percentage of deaths worldwide caused by water, air, and soil pollution | 40% |
| Number of people killed by air pollution from smoke and chemicals annually | 3 million |
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What You'll Learn
Soil pollution causes 40% of deaths worldwide
Soil pollution is a significant threat to human health and well-being, and it is estimated to contribute to a substantial number of deaths worldwide each year. According to a Cornell research survey, water, air, and soil pollution are responsible for approximately 40% of global deaths. This highlights the severe impact of environmental degradation on human health.
Soil contamination by chemicals and pathogens can have detrimental effects on human health through direct contact, inhalation, or indirect exposure via the food chain. Pollutants in the soil can increase the risk of various diseases, including cardiovascular issues and other non-communicable diseases. Contaminants such as lead, arsenic, cadmium, mercury, and pesticides have been found in soil and water sources, posing risks to those who consume contaminated food or water.
The World Health Organization (WHO) estimates that about one-tenth of the global population falls ill each year due to the consumption of contaminated food. Additionally, soil-transmitted helminths (parasitic worms) affect around 24% of the world's population, primarily in impoverished communities lacking proper sanitary measures. The impact of soil pollution on human health may be underestimated, especially in developing countries, due to limited data and investments in pollution identification and quantification.
Hotspots for human exposure to soil pollution include contaminated sites, certain agricultural and urban soils, and previously flooded lands. These areas pose significant risks to human health, and the interconnectivity of environmental components makes it challenging to pinpoint the exact source of pollution. However, it is clear that the consequences of soil pollution disproportionately affect vulnerable populations, including children and the elderly, as well as poorer households residing near industrial sites.
The burden of disease attributable to the environment is significant, with an estimated 13 million deaths annually, according to the SDG Target 3.9 on mortality from environmental pollution. Soil pollution, along with air and water pollution, contributes to this alarming number of deaths and illnesses. Addressing environmental pollution and promoting healthier environments are crucial steps in reducing the global burden of disease and improving the well-being of populations worldwide.
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Soil pollutants cause cardiovascular disease
Soil pollution is a significant threat to human health and well-being, particularly in low- and middle-income countries. While the specific number of deaths caused by soil pollution is challenging to determine due to various factors, it is clear that soil pollutants contribute to cardiovascular disease, which is the leading cause of mortality globally, accounting for approximately 17.9 million deaths annually.
Soil pollution refers to the contamination of soil with various substances, including heavy metals, pesticides, and plastics. These pollutants can have detrimental effects on human health, especially when they enter the human body through different routes of exposure. The most common pathways include accidental ingestion of contaminated food, dust, and soil particles, inhalation of polluted soil or vapours, and dermal contact.
Additionally, soil pollutants have been found to disrupt the body's circadian rhythm or internal body clock. This disruption can have far-reaching consequences for cardiovascular health, as the body's natural rhythms play a crucial role in regulating blood pressure, heart rate, and other cardiovascular functions. When the body's internal clock is disturbed, it can lead to irregularities in these functions, increasing the risk of cardiovascular events.
The impact of soil pollution on cardiovascular health is particularly pronounced in vulnerable populations, including those in low- and middle-income countries. In these regions, populations may be disproportionately exposed to environmental pollutants, including heavy metals and pesticides, due to the globalization of food supply chains. Additionally, desert dust contaminated with soil pollutants can travel long distances, affecting populations far from the source of pollution. For example, particles from soil in China and Mongolia have been associated with an increased risk of heart attacks in Japan.
While the exact number of deaths attributable to soil pollution may be difficult to ascertain, it is evident that soil pollutants play a significant role in causing and exacerbating cardiovascular disease. Addressing soil pollution and implementing preventive measures are crucial steps towards reducing the global burden of cardiovascular disease and improving overall public health.
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Soil-transmitted parasitic worms affect 24% of the global population
Soil pollution is a growing threat to global health, and while it is difficult to establish an exact number of deaths caused by soil pollution, it is estimated that environmental factors, including soil pollution, contribute to a large number of deaths worldwide. According to the World Health Organization (WHO), soil-transmitted parasitic worms affect 24% of the global population, which equates to approximately 1.5 billion people. These infections are caused by different species of parasitic worms, transmitted through eggs present in human feces that contaminate soil in areas with poor sanitation.
The impact of these infections varies depending on the intensity of the infection. People with light infections may not experience any noticeable symptoms, while heavier infections can lead to intestinal issues such as diarrhea and abdominal pain, malnutrition, weakness, and impaired growth. Infections of very high intensity can even cause intestinal obstruction requiring surgical intervention. Additionally, soil-transmitted helminths impair the nutritional status of those infected by feeding on host tissues, including blood, resulting in iron and protein deficiencies. Certain types of worms, such as hookworms, can cause chronic intestinal blood loss, leading to anemia.
The prevalence of these infections is particularly high in tropical and subtropical regions, with the greatest numbers occurring in sub-Saharan Africa, the Americas, China, and East Asia. Over 267 million preschool-age children and 568 million school-age children reside in areas where these parasites are intensely transmitted, necessitating treatment and preventive measures. The WHO recommends periodic medicinal treatment, or deworming, for individuals living in endemic areas to reduce the worm burden and protect at-risk populations.
The negative health consequences of soil-transmitted parasitic worms are exacerbated in communities lacking proper sanitary measures. The transfer of contaminants into the food chain, through the ingestion of contaminated food, dust, or soil particles, is a significant route of exposure. The interconnectivity of environmental components, including water, air, land, and organisms, further complicates the identification of the origin of pollution and the quantification of its health impacts.
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Soil pollution is caused by toxic chemicals and pathogens
Soil pollution is a significant threat to human health and well-being, causing various diseases and contributing to premature deaths worldwide. While the specific number of deaths directly attributed to soil pollution is challenging to ascertain due to its interplay with other environmental factors, it is evident that soil contamination by toxic chemicals and pathogens plays a crucial role in exacerbating health issues and increasing mortality rates.
Toxic chemicals are a primary concern in soil pollution. These chemicals, often introduced through industrial activities, agricultural practices, and improper waste disposal, include petroleum hydrocarbons, solvents, pesticides, lead, and other heavy metals. The presence of these contaminants in the soil can lead to oxidative stress and inflammation in the human body, triggering cardiovascular, neurodegenerative, and metabolic diseases. For example, lead (Pb) contamination in soil, commonly stemming from vehicle exhaust, can result in elevated levels of this toxic metal in the body, causing adverse health effects, particularly in children, including behavioural issues, impaired cognitive function, and reduced IQ.
Pathogens, another significant cause of soil pollution, are disease-causing microorganisms that can be transmitted through various means, including airborne dust and direct contact with contaminated soil. These pathogens include harmful bacteria, viruses, and fungi that can infect humans and trigger infectious diseases. For instance, the disposal of munitions and the testing of biological weapons have contaminated soils with harmful pathogens, posing risks to nearby populations. Furthermore, the presence of pathogens in the soil can contribute to the spread of infectious diseases, such as waterborne illnesses, by contaminating underlying water supplies.
The impact of soil pollution by toxic chemicals and pathogens is far-reaching and insidious. While the exact data on mortality rates specifically due to soil pollution may be elusive, it is clear that pollution, including soil contamination, takes a significant toll on human lives. In 2015, diseases caused by pollution were responsible for approximately 9 million premature deaths worldwide, accounting for 16% of all deaths and surpassing mortality rates from other significant health concerns such as AIDS, tuberculosis, and malaria. Soil pollution contributes to this alarming statistic, underscoring the urgent need to address this issue.
The adverse effects of soil pollution extend beyond mortality rates, impacting human health in numerous ways. Pollutants in the soil can cause various diseases, including ischaemic heart disease, cancer, obstructive pulmonary disease, strokes, mental and neurological conditions, and diabetes. Moreover, soil pollution can lead to reduced crop yields, threatening food security and ecosystem stability. The complex nature of soil pollution, influenced by various factors such as soil type and the specific chemicals involved, makes risk assessment and remediation challenging, necessitating interdisciplinary expertise in geology, hydrology, and chemistry for effective management.
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Soil pollution is an existential threat to human health
Soil contamination by chemicals and pathogens occurs through various human activities, including the use of nitrogen fertilizers, combustion of fossil fuels, and industrial emissions. These pollutants can have detrimental effects on human health through direct contact, inhalation, or ingestion of contaminated food, dust, or water. The health impacts of soil pollution are wide-ranging and can affect multiple organs and systems in the body, including the lungs, skin, gut, liver, kidneys, immune system, reproductive system, and cardiovascular system.
The World Health Organization (WHO) estimates that around 24% of the global population is affected by soil-transmitted helminths (parasitic worms), primarily in communities lacking proper sanitary measures. Contaminated food intake is the main pathway for soil contaminants to enter the human body, and WHO estimates that about one-tenth of the world's population falls ill each year from consuming contaminated food. The impact of soil pollution on human health may be underestimated, especially in developing countries, due to limited data and investment in pollution identification and quantification.
Hotspots for human exposure to soil pollution include contaminated sites, certain agricultural and urban soils, and previously flooded land. Studies have found high levels of toxic pollutants, such as arsenic, chromium, lead, and cadmium, in floodplain soils along rivers like the Elbe in Europe. These pollutants can accumulate in the food chain, leading to the contamination of cereals, seafood, chocolate, and vegetables, which poses a significant threat to global food safety.
The negative consequences of soil pollution extend beyond human health, impacting biodiversity and ecosystem functioning. Soil degradation due to pollution, deforestation, excessive fertilization, and pesticide use diminishes the rich biodiversity that soil supports. Soil pollution also contributes to climate change and species extinction, further threatening the sustainability of human societies. Addressing soil pollution requires comprehensive population policies, conservation efforts, and sustainable practices that respect natural systems and prioritize the well-being of current and future generations.
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Frequently asked questions
It is difficult to pinpoint an exact number of deaths caused by soil pollution due to the challenge of establishing cause-and-effect relationships and the varying degrees of exposure. However, it is estimated that soil pollution contributes to hundreds of thousands of premature deaths annually worldwide. According to a 2007 Cornell research survey, about 40% of deaths worldwide are attributed to water, air, and soil pollution.
Soil pollution is associated with an increased risk of various diseases, including cardiovascular disease and other non-communicable diseases. It can also lead to cancer, birth defects, immune system defects, and other severe health issues. Soil contaminants can affect multiple organs, including the lungs, skin, gut, liver, and kidneys, as well as the immune, reproductive, nervous, and cardiovascular systems.
Yes, vulnerable groups such as children, the elderly, and people living in poverty are more susceptible to the adverse health impacts of soil pollution. This is often due to their proximity to contaminated sites, lack of access to sanitary measures, and limited resources for prevention and treatment.
Soil pollution disproportionately affects individuals in low-income communities and developing countries, exacerbating global health inequities. The lack of access to clean water, sanitation, and adequate healthcare in these regions further compounds the health risks associated with soil pollution.
