Chloe Zhang
Plastic is a cheap, durable, and versatile material that has become integral to human life. However, plastic pollution is one of the most pressing environmental issues today, with plastic waste accumulating in ecosystems worldwide and threatening wildlife and human health. Plastic pollution is caused by the improper disposal of plastic products, which can take thousands of years to degrade. This pollution has contaminated oceans, soils, and waterways, with microplastics found in the guts of marine life and even in human food sources. The toxic chemicals released by plastics can cause physical, chemical, and biological harm to organisms, and the ingestion of plastic has led to intestinal blockages and deaths in animals. With plastic production continuing to increase, addressing plastic pollution is crucial to mitigate its adverse effects on the planet and human health.
| Characteristics | Values |
|---|---|
| Plastic pollution | Affects land, waterways, and oceans |
| Plastic waste | Found in oceans, street drains, campgrounds, national parks, and Mount Everest |
| Plastic debris | Found in the guts of more than 90% of the world's seabirds, in the stomachs of more than half of the world's sea turtles, and chokes whales |
| Plastic production | 8.3 billion metric tons of plastic have been produced since the 1950s |
| Plastic disposal | 79% of plastic produced in the last 70 years has been thrown away, 9% has been recycled, and the rest has been incinerated |
| Plastic waste in oceans | It is estimated that 1.1 to 8.8 million tons of plastic waste enters the ocean each year, and by 2050, the mass of plastic in the oceans will exceed the mass of fish |
| Microplastics | Found in more than 100 aquatic species, including fish, shrimp, and mussels |
| Plastic toxins | BPA has been detected in 95% of adults in the US and has been linked to disruptions in fertility, reproduction, and sexual maturation |
| Plastic waste and climate change | In 2019, the production and incineration of plastic contributed greenhouse gas emissions equivalent to 850 million tons of CO2, and by 2050, plastic could emit 56 billion tons of greenhouse gas emissions |
| Microplastics in soil | Alter plant growth, decrease seedling germination, affect the number of leaves, stem diameter, and chlorophyll content |
| Plastic waste and biodiversity | Plastic waste affects biodiversity in marine environments and introduces invasive species |
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What You'll Learn
Plastic waste in oceans
The plastic waste in oceans ranges from large items such as bottles and bags to microplastics, which are tiny particles formed from the breakdown of plastic materials. These microplastics are spread throughout the water column and have been found in even the most remote regions, including the Mariana Trench, the deepest point on Earth. They are nearly impossible to filter out without causing harm to marine life, becoming a permanent part of the ecosystem.
The ingestion of plastic by marine organisms is a significant concern. It leads to intestinal blockage and can cause death. Nearly every species of seabird consumes plastic, and it is found in the guts of over 90% of the world's seabirds and in the stomachs of more than half of the world's sea turtles. Plastic waste also entangles marine animals, causing strangulation, injury, and suffocation. It disrupts the natural movement of marine creatures, leading to starvation and affecting their ability to reproduce and survive.
The impact of plastic waste in oceans extends beyond the immediate harm to marine life. It also affects human health, as microplastics can enter the food chain. Toxins accumulate on the surface of microplastics, which are then ingested by small marine organisms and gradually move up the food chain, eventually reaching humans.
Addressing the issue of plastic waste in oceans requires a multifaceted approach. It involves reducing plastic production and consumption, improving recycling practices, and implementing measures to trap plastic particles before they enter the ocean, such as at river mouths. While there are challenges, addressing ocean plastic pollution can bring numerous benefits, including reducing greenhouse gas emissions and preserving the health of the marine environment, which is essential for the survival and well-being of countless people and future generations.
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Plastic in food chains
Plastic pollution has infiltrated every part of the planet, from the deepest ocean trenches to the Antarctic sea ice. It is spread widely in soils on land and in drinking water, and can even end up in the food we eat.
Microplastics, which are small plastic pieces less than 5mm long, have been found in the guts of marine animals, in seafood, and in plant and animal origin foods, drinks, and food additives. They are created by the unintentional degradation of large plastic objects, such as plastic bags, boxes, ropes, and nets. Over time, these large pieces of plastic break down into smaller and smaller particles due to ultraviolet radiation from the sun and mechanical influences, such as waves.
The release of microplastics into the environment happens through natural disintegration by weathering and microbial activity, the decomposition of macroplastics into microplastics by the direct activity of organisms, and the resuspension of past microplastic contamination in soil or sediment. Microplastics can enter the human body through ingestion (by food and water), inhalation (indoor and outdoor air), and skin contact (by personal care products, dust, and textiles).
Fish ingest small pieces of plastic due to their continuous uptake of water. Microplastics then move up the food chain when other animals, including humans, eat fish contaminated with microplastics. A study found that 1 in 3 fish caught for human consumption contain plastics. Another study showed that 100% of baby sea turtles have plastic in their stomachs.
The impact of ingesting plastics on human health is not yet fully understood, but there is research that suggests it could be harmful. Studies have shown that chemicals added during the production of plastics can disrupt the endocrine system and the hormones that regulate growth and development. Chemicals found in plastic have been linked to cancer, heart disease, and poor foetal development.
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Plastic's effects on human health
Plastic is one of the most pervasive materials on the planet, and its impact on human health is significant and complex. At every stage of its lifecycle, from production to disposal, plastic poses risks to human health.
The production of plastic involves the extraction of fossil fuels, such as crude oil and natural gas, and the use of energy-intensive processes to transform these raw materials into plastic resins. This extraction and refining release toxic substances, including carcinogens and neurotoxic chemicals, into the air and water, contributing to air and water pollution. Communities living near refining facilities are particularly at risk of exposure to these toxic chemicals, which have been linked to various health issues, including cancer, neurological problems, reproductive issues, and developmental toxicity.
During its use, plastic can degrade and shed microplastics, especially when exposed to factors like sunlight, heat, and physical stress. These microplastics can then contaminate food and beverages, leading to their ingestion by humans. Microplastics have been detected in various foods, including meat and milk, and have even been found in human blood and placenta. Studies indicate that microplastics can enter the human bloodstream and lodge in airways, potentially causing inflammation and respiratory complications.
Additionally, microplastics may act as carriers for toxic chemicals, such as endocrine disruptors, which can interfere with hormones and lead to health issues like thyroid, breast, and prostate cancer, as well as reproductive problems and impaired fertility. The presence of microplastics in the human body has also been linked to inflammatory bowel disease, colon cancer, and gut health issues.
The improper disposal of plastic further exacerbates the problem. Burning plastic, a common disposal method, releases harmful chemicals like polychlorinated biphenyls (PCBs) into the air, contributing to air pollution and respiratory issues. With only 9% of plastic waste being recycled, the majority of plastic ends up in landfills, oceans, and the environment, where it continues to degrade and release toxic chemicals, posing risks to both human health and the environment.
As plastic production increases, human exposure to plastic and its associated health risks will only grow. Addressing this global health crisis requires a full lifecycle approach to understand and mitigate the toxic impacts of plastic on human health, as well as a transition towards more sustainable practices to reduce plastic production, use, and disposal.
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Plastic's impact on wildlife
Plastic pollution is one of the most pressing environmental issues, threatening wildlife and ecosystems across the globe. It is estimated that marine plastics contribute to the death of more than 100,000 marine mammals annually, with millions of animals affected by plastics every year, including birds, fish, and other marine organisms. The impact of plastic pollution on wildlife is widespread and devastating, affecting both marine and terrestrial ecosystems.
One of the most significant ways plastics impact wildlife is through ingestion. Animals often mistake plastic debris for food, leading to blockages in their digestive systems, starvation, malnutrition, and even death. Marine creatures such as sea turtles, whales, and seabirds are particularly vulnerable to ingesting plastic bags, bottle caps, and other plastic fragments. Additionally, microplastics, which are invisible to the naked eye, are easily consumed by wildlife and can adsorb toxins, transferring them to the fatty tissues of the organisms that ingest them. These toxins can accumulate over time, posing additional health risks.
Another way plastics harm wildlife is through entanglement. Large items of plastic, such as discarded fishing nets, ropes, and packaging materials, can trap and entangle marine mammals and fish, leading to injuries, amputations, and death. This physical entanglement disrupts the ability of animals to move, hunt, and feed, impacting their survival and reproductive success. Plastic pollution also contributes to habitat degradation, smothering coral reefs and preventing their healthy growth.
The impact of plastic pollution extends beyond the oceans. Microplastics can enter soil and water systems, releasing additives like phthalates and Bisphenol A (BPA), which can disrupt the hormone systems of vertebrates and invertebrates. A 2020 study found that terrestrial microplastic pollution led to a decrease in species living below the surface, such as mites, larvae, and other tiny creatures, resulting in less fertile soil and land. Chlorinated plastic, such as food packaging and medical devices, can also release harmful chemicals into the surrounding soil and groundwater.
Plastic pollution has become ubiquitous, with inefficient garbage collection systems and low recycling rates struggling to manage the increasing production of disposable plastic products. As a result, plastic waste accumulates in ecosystems, disrupting the natural balance and functioning of habitats. The impact of plastic on wildlife is devastating, and efforts to reduce, reuse, and recycle plastic are essential to mitigate its harmful effects on the environment and the diverse range of species that depend on it.
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Microplastics in soil
Plastic pollution is one of the most pressing environmental issues, with plastic waste harming wildlife, the environment, and human health. Plastic waste is found everywhere, from the Arctic to Antarctica, in street drains, oceans, and even on Mount Everest.
Agricultural activities such as plastic mulching and the application of municipal wastes are major contributors to microplastic pollution in soils. The use of plastic in agriculture has led to the accumulation of plastic pollution in agricultural systems, negatively impacting soil biodiversity, food safety, and human health. Microplastics in soil alter plant growth, decrease seedling germination, and affect the number of leaves, stem diameter, and chlorophyll content in plants.
Furthermore, microplastics can interact with soil fauna, affecting their health and burrowing behaviour. Earthworms, for example, make different burrows when microplastics are present in the soil, impacting their fitness and soil conditions. Microplastics have also been found to decrease the number of species that live below the surface, such as mites, larvae, and other tiny creatures essential for maintaining soil fertility.
The presence of microplastics in soil can have long-term negative effects on ecosystems. They can release toxic chemicals, such as plasticisers, polycyclic aromatic hydrocarbons (PAHs), antibiotics, and potentially toxic elements (PTEs), which can seep into groundwater and other water sources. These toxic chemicals can then be ingested by animals and humans, leading to potential health risks.
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Frequently asked questions
Plastic enters the ocean through litter being blown into the sea, picked up by tides on beaches, or intentional dumping. Plastic waste also flows into the ocean from land through major rivers, which act as conveyor belts.
Plastic waste in the ocean harms marine life through entanglement, ingestion, suffocation, starvation, dispersal, and rafting of organisms. It also introduces invasive species and affects biodiversity and trophic relationships. Plastic waste has been found in the guts of more than 90% of the world's seabirds and in the stomachs of more than half of the world's sea turtles.
Plastic pollution exposes humans to toxic chemicals such as BPA, which has been linked to disruptions in fertility, reproduction, and sexual maturation. Microplastics in the soil can also alter plant growth, affecting food safety and human health. Additionally, the ingestion of plastic-contaminated seafood can have negative health consequences.
The production and incineration of plastic contribute to greenhouse gas emissions. In 2019, these activities released the equivalent of 850 million tonnes of carbon dioxide (CO2) into the atmosphere. By 2050, plastic could emit up to 56 billion tonnes of greenhouse gas emissions.
