Sofia Martinez
Plastic pollution is an increasingly pressing environmental issue, with single-use plastics accounting for 40% of all plastic produced each year. The majority of plastic waste ends up in landfills, where it can take up to 1000 years to degrade, leaching toxic substances into the soil. These toxins can then enter the food chain, with potentially harmful effects on both animal and human health. Microplastics, which are plastic particles smaller than 5mm in diameter, have been shown to affect the behaviour of soil fauna, and can also carry disease-causing organisms. With the volume of plastic waste continuing to grow, reducing plastic pollution in the soil will be key to protecting global food security and ensuring a sustainable future for our planet.
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What You'll Learn
- Plastic waste in landfills can take up to 1,000 years to degrade, leaching toxins into the soil
- Plastic particles can carry disease-causing organisms, acting as a vector for diseases
- Sewage sludge used as fertiliser on fields contains thousands of tons of microplastics
- Intensive agriculture is a major source of plastic pollution in soils
- Plastic pollution in soils can hinder the UN's Sustainable Development Goals
Plastic waste in landfills can take up to 1,000 years to degrade, leaching toxins into the soil
Plastic pollution is one of the most pressing environmental issues, with the world drowning in discarded plastic. The majority of plastic waste ends up in landfills, where it can take up to 1,000 years to degrade. During this slow degradation process, toxic substances are leached into the soil and water.
The impact of microplastics in soils, sediments, and freshwater could have a long-term negative effect on ecosystems. Terrestrial microplastic pollution is estimated to be four to 23 times higher than marine microplastic pollution. The surfaces of plastic fragments can carry disease-causing organisms and act as a vector for diseases in the environment.
Microplastics can interact with soil fauna, affecting their health and soil functions. For example, earthworms make their burrows differently when microplastics are present, which affects their fitness and the soil condition. Chlorinated plastic can release harmful chemicals into the surrounding soil, which can then seep into groundwater or other water sources and the ecosystem.
The additives in plastics, such as phthalates and Bisphenol A (BPA), can leach out during the degradation process. These additives are known for their hormonal effects and can disrupt the hormone systems of vertebrates and invertebrates. Nano-sized particles may also cause inflammation, traverse cellular barriers, and cross highly selective membranes such as the blood-brain barrier or the placenta. The long-term effects of these changes have not been fully explored, but they can already impact behaviour, as seen in fish.
The extensive use of plastics in agriculture, such as plastic mulch films, fertilizers, and greenhouse films, is a significant source of plastic contamination in soils. As plastic breaks down, it can be transported deep into the soil, polluting underground water sources. The increasing quantity of microplastics in soils is a burden on the soil environment, particularly in agroecosystems, and presents a new stressor for soil-dwelling organisms.
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Plastic particles can carry disease-causing organisms, acting as a vector for diseases
Plastic pollution is a pressing environmental issue, with single-use plastics accounting for 40% of the plastic produced annually. Plastic waste is present everywhere, from Asia to North America to Africa, and is particularly visible in developing nations, where garbage collection systems are often inefficient or non-existent.
The presence of microplastics in the environment can also impact soil fauna. Earthworms, for example, make their burrows differently when microplastics are present in the soil, affecting their fitness and the soil condition. Chlorinated plastic can release harmful chemicals into the surrounding soil, which can then seep into groundwater or other water sources.
While the impact of microplastics on human health is still being studied, microplastics have been detected throughout the human body, including in the blood, saliva, liver, kidneys, and placenta. Studies in cell cultures, marine wildlife, and animal models indicate that microplastics can cause oxidative damage, DNA damage, and changes in gene activity, which are known risk factors for cancer development.
The medical community is becoming more knowledgeable about plastic particle pollution and the potential diseases and syndromes linked to it. As the World Health Organization underscored in a 2022 report, current technologies don't enable researchers to fully understand the impact of microplastics on human health. However, the ubiquity of microplastics in the environment has led to urgent calls for more research and regulation.
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Sewage sludge used as fertiliser on fields contains thousands of tons of microplastics
Plastic pollution is a pressing environmental issue, with the planet swimming in discarded plastic. Plastic pollution is particularly visible in developing Asian and African nations, but it is a global problem that is present everywhere from Asia to North America to Africa.
One of the ways in which plastic enters the environment is through the application of treated sewage sludge onto agricultural fields. Sewage sludge is a byproduct of wastewater treatment plants and is widely used in the agricultural sector. However, it may contain emerging contaminants, including microplastics, that can pose a significant risk to the environment and human health.
Studies have shown that sewage sludge applied to agricultural fields as fertiliser can lead to the contamination of surrounding areas with microplastics. This is due to the high volumes of microplastics that can be systematically added to agricultural soils through the application of sewage sludge. The reported microplastic concentrations in sewage sludge vary considerably, but can be as high as 1.69 x 10^5 microplastics/g.
The use of sewage sludge as fertiliser on fields is a major contributor to the presence of microplastics in agricultural soils. Microplastics can have detrimental effects on soil health, interacting with soil fauna and affecting their health and soil functions. For example, earthworms make their burrows differently when microplastics are present in the soil, affecting the earthworm's fitness and the soil condition. Chlorinated plastic can also release harmful chemicals into the surrounding soil, which can then seep into groundwater or other water sources.
The problem of microplastics in sewage sludge used as fertiliser on fields highlights the importance of developing sustainable sludge disposal methods and implementing technologies to remove microplastics from wastewater. By addressing these challenges, we can mitigate the environmental impacts of plastic and promote sustainable waste management practices.
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Intensive agriculture is a major source of plastic pollution in soils
Plastic mulch films, for example, are considered an essential tool for weed management, temperature and moisture modulation, and cost-effective crop production. Covering over 25 million acres of farmland globally, these films constitute the largest single source of field soil plastic pollution. Other plastic products used in agriculture include greenhouse films, silage, shade and protection nets, and drip irrigation. Many of these products are single-use plastics, which are used for mere minutes to hours but may persist in the environment for hundreds of years.
The problem of plastic pollution in soils is not limited to the direct application of plastics to fields. Sewage sludge, which is applied to agricultural soils for fertilization, is generated from wastewater treatment plants (WWTPs) that are not 100% efficient in removing plastics and other materials. As a result, microplastics are often detected in effluents, with studies finding that a significant percentage of suspected microplastic materials from WWTPs enter the soil ecosystem.
The impact of plastic pollution in soils is a growing concern for environmental and human health. Plastic particles can release potentially toxic substances and additives, such as phthalates and Bisphenol A (BPA), which can leach into the soil and groundwater systems. These additives are known for their hormonal effects and can disrupt the hormone systems of both vertebrates and invertebrates. Chlorinated plastic, for instance, can release harmful chemicals that seep into groundwater and the ecosystem.
Furthermore, microplastics can interact with soil fauna, affecting their health and soil functions. Research has shown that the presence of microplastics leads to a decrease in species that live below the surface, such as mites, larvae, and other tiny creatures that maintain soil fertility. The long-term effects of plastic pollution in soils are still not fully understood, and experts warn that the impact of microplastics in soils could have negative consequences for ecosystems and food security. Addressing plastic pollution in soils will be crucial to achieving global sustainability goals related to poverty elimination, zero hunger, and access to safe drinking water.
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Plastic pollution in soils can hinder the UN's Sustainable Development Goals
Plastic pollution in soils is often associated with intensive agriculture, and plastic products such as mulch films, greenhouse films, and fertilizers contribute to this issue. These plastics can break down into microplastics and nanoparticles, which can then find their way into the soil and groundwater systems. Microplastics in soils can interact with soil fauna, affecting their health and soil functions. For example, earthworms build their burrows differently when microplastics are present, impacting their fitness and soil conditions. Additionally, chlorinated plastic can release harmful chemicals into the soil, which can then seep into water sources and the ecosystem.
The presence of microplastics in soils can also have broader ecological consequences. Research suggests that terrestrial microplastic pollution is much higher than marine microplastic pollution, and it has led to a decrease in species that live below the surface, such as mites, larvae, and other tiny creatures that maintain land fertility. This loss of biodiversity can further impact ecosystems and agricultural productivity, hindering efforts towards sustainable development.
Furthermore, plastics often contain additives that enhance their strength, flexibility, and durability. However, these additives can have negative environmental and health impacts. For instance, phthalates and Bisphenol A (BPA) are known to disrupt the hormone systems of vertebrates and invertebrates. Nano-sized particles may cause inflammation, cross cellular barriers, and impact gene expression. These health risks associated with plastic pollution in soils can hinder progress towards ensuring healthy lives and promoting well-being for all ages (SDG 3).
To address these challenges, efforts are being made to reduce, recycle, and properly manage plastic waste. The Food and Agriculture Organization (FAO) and the United Nations Environment Programme (UNEP) have collaborated on initiatives like the Global Symposium on Soil Pollution and the Global Assessment of Soil Pollution to raise awareness and develop solutions. Additionally, organizations like United Youth for Peace and Reconciliation (UYFPAR) in Liberia focus on education and sports to promote environmental protection and prevent plastic pollution. These collective actions are essential for mitigating the negative impacts of plastic pollution in soils and ensuring progress towards the UN's Sustainable Development Goals.
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Frequently asked questions
Plastic waste breaks down into microplastics, which are then transported into the soil through various means, including wind and water. These microplastics can alter the characteristics of soil flora and fauna, affecting soil functions and reducing soil quality.
Microplastics are plastic fragments smaller than 5mm in diameter. They are formed when plastic waste gradually degrades, and they can further disintegrate into nanoparticles, which are less than 0.1 micrometres in size.
Microplastics in the soil can act as a vector for environmental pollutants and disease-causing organisms, potentially impacting groundwater and other water sources. They can also disrupt soil nutrient cycling and food production, posing risks to the ecosystem and global food security.
The primary sources of plastic contamination in agricultural soils include sewage sludge, coated fertilizers, irrigation water, agrochemicals, and the breakdown of larger plastic materials such as mulching and greenhouse films. Single-use plastics, such as plastic mulch films and plastic fertilizers, are also significant contributors to soil pollution.
Addressing plastic pollution in soils requires a combination of legislative actions, improved waste management practices, and the development of biodegradable alternatives. Implementing laws that limit or ban the use of certain plastics, such as single-use plastic bags, is essential. Additionally, investing in research to standardize detection methods for microplastics in soil and improve our understanding of their long-term impacts is crucial.
