Helena Joyce
Plastic pollution in the ocean is a pressing global issue, with plastic debris infiltrating marine life and ecosystems. Microplastics, defined as plastic particles smaller than 5mm, are a significant contributor to this pollution. They originate from various sources, including the degradation of larger plastic debris and microbeads from health and beauty products. While the exact percentage of microplastics in ocean plastic pollution is challenging to determine due to their diverse shapes and sizes, studies indicate that microplastics make up a substantial portion. In 2016, four sources of microplastics accounted for 11% of total ocean plastic pollution, and their presence is detected in marine organisms and seawater worldwide. The impact of microplastics on marine life and the environment is a growing concern, with efforts underway to address this issue through research, legislation, and cleanup initiatives.
| Characteristics | Values |
|---|---|
| Definition of microplastics | Plastic particles smaller than 5 millimeters |
| Percentage of ocean plastic pollution that is microplastics | 11% in 2016 |
| Microplastics in the Great Pacific Garbage Patch | 8% |
| Microplastics in the North Atlantic and North Pacific Oceans | Highest concentrations of plastic debris reported until now |
| Microplastics in the Tropical Eastern Pacific and Galápagos | Found in 100% of water samples and marine organisms |
| Global production of plastics | Projected to rise by 33 billion tons by 2050 |
| Plastic produced annually | 400 million metric tons |
| Plastic that ends up in the ocean | Less than 0.5% |
| Plastic that entered the ocean since 1950 | 99.8% has sunk below the first few hundred feet |
| Microplastics on the seafloor | 10,000 times more than in contaminated surface waters |
| Microplastics in the human food chain | Found in 100% of specimens of 16 different species of fish, squid, and shrimp |
| Main contributors to microplastic pollution | High-income countries, accounting for more than one-third of the global total in 2016 |
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What You'll Learn
Microplastics are \<5mm in size
Microplastics are a significant contributor to ocean plastic pollution. They are commonly defined as plastic particles smaller than 5mm in size (about the diameter of a standard pencil eraser). They come from a variety of sources, including the breakdown of larger plastic debris, microbeads in health and beauty products, plastic fibres from synthetic textiles, and plastic pellets used in manufacturing. While there is no standard definition of microplastics, their small size makes them difficult to clean up and increases their bioavailability, potentially impacting a wide range of species.
The presence of microplastics in the ocean is a growing global concern. High-income countries are major contributors, and without intervention, ocean microplastic pollution is projected to more than double by 2040. While plastic pollution in the ocean comes from thousands of sources worldwide, human activity and improper waste management are significant factors. The production and disposal of plastic materials, such as face masks during the COVID-19 pandemic, have also added to the vast plastic and microplastic waste in the environment.
Microplastics have been detected in all oceanic environments and inside marine organisms. They are found in high concentrations in the North Atlantic and North Pacific Oceans, and the Great Pacific Garbage Patch, located between Hawaii and California, is a highly polluted area. While the garbage patch is not a solid mass, it is estimated to contain around 100 million kilograms of floating plastic, with about 8% consisting of microplastics.
The impact of microplastics on marine life is a particular area of concern. Marine snowfall, a natural process where debris sinks from the surface to the deep sea, is being infiltrated by microplastics. This faux fall is altering the planet's ancient cooling process. Additionally, aquatic life and birds can mistake microplastics for food, and microplastics have been found in marine organisms intended for human consumption.
While there is still much to learn about microplastics, ongoing research and initiatives are working towards addressing this global issue. The NOAA Marine Debris Program is leading efforts to study microplastics, and organisations like The Ocean Cleanup are actively removing plastic objects from the ocean to prevent them from breaking down into microplastics. Additionally, countries participating in the UN Environment Assembly have adopted resolutions to address plastic pollution throughout its lifecycle. These collective efforts provide hope for reducing the flow of plastic pollution into our oceans.
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They come from larger plastic debris
Microplastics are plastic particles smaller than 5 millimetres in length. They are commonly found in the ocean and are known to be harmful to marine life and the environment. Microplastics come from a variety of sources, including larger plastic debris that degrades into smaller pieces. This process of fragmentation occurs through a combination of physical, biological, and photochemical degradation, including photo-oxidation caused by sunlight exposure.
Larger plastic debris can break down into microplastics through natural weathering processes and mechanical degradation. This degradation can occur both at sea and on land. Sources of secondary microplastics, which come from larger plastic products, include water and soda bottles, fishing nets, plastic bags, microwave containers, tea bags, and tire wear. For example, microplastics from tire wear have been found to contribute to the die-off of at-risk salmon in the U.S. Pacific Northwest.
The breakdown of plastic fibres from synthetic textiles, such as clothing, is also a significant source of microplastics in the ocean. When synthetic clothing is washed, it can release microplastics that contribute to ocean pollution. Approximately 35% of all ocean microplastics come from textiles and clothing, primarily due to the erosion of polyester, acrylic, or nylon-based fabrics.
In addition to the breakdown of plastic products, larger plastic debris can also fragment into microplastics through mechanical processes. For example, microplastic "scrubbers" used in air-blasting technology to remove rust and paint from machinery and boat hulls can become contaminated with heavy metals as they diminish in size. These scrubbers, often made of acrylic, melamine, or polyester, contribute to the microplastic pollution in aquatic environments.
The presence of microplastics in the ocean is a growing global concern. While there is ongoing research to understand the impacts of microplastics, it is clear that they pose a significant threat to marine life and the environment. The degradation of larger plastic debris into microplastics is a major contributor to this issue, and addressing this source of pollution is crucial for mitigating the negative consequences of microplastics in our oceans.
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Microbeads are a type of microplastic
Microplastics are small plastic pieces that are less than five millimeters long. They can be harmful to oceans and aquatic life. They come from a variety of sources, including larger plastic debris that degrades into smaller pieces. Microbeads, a type of microplastic, are tiny pieces of manufactured polyethylene plastic. They are added as exfoliants to health and beauty products, such as some cleansers and toothpastes. These microbeads are not a recent problem and were first added to personal care products about fifty years ago.
Microbeads are usually washed into the sewage system immediately after use. Their small size prevents them from being retained by preliminary treatment screens at wastewater plants, allowing some to enter rivers and oceans. On average, 0-7 microbeads per liter are discharged, which amounts to around 8 trillion microbeads released into waterways every day.
In 2015, the United States banned the use of microbeads in rinse-off cosmetic products. However, many industries have since shifted towards using FDA-approved "rinse-off" metallized-plastic glitter as their primary abrasive agent. Despite the ban, microplastics are still a significant problem, as plastic can break up into very small particles that are ingested by aquatic life and birds.
Microbeads have been found to absorb dangerous chemicals such as pesticides and polycyclic aromatic hydrocarbons. They have also been linked to the die-off of at-risk salmon in the US Pacific Northwest. In addition to their environmental impacts, microbeads can also be ingested by humans and other animals.
While there is no standard definition of microplastics, they are typically defined as plastic particles smaller than five millimeters. They are often microscopic and made of synthetic polymers. Microplastics are not limited to microbeads and can be found in various products, including sunscreen, shampoo, makeup, and deodorant.
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They are ingested by marine life
While the exact percentage of ocean plastic pollution that is made up of microplastics is unknown, it is clear that they are a significant contributor to the issue. Microplastics are plastic particles smaller than 5 millimetres, and they come from a variety of sources, including larger plastic debris that degrades over time, microbeads in health and beauty products, and plastic fibres from synthetic textiles.
Microplastics are ingested by marine life, causing direct and damaging effects. Marine organisms, including fish, squid, shrimp, birds, and other aquatic life, mistake microplastics for food. These small plastic particles infiltrate marine snowfall, the primary food source for life in the deep sea. A recent study found 10,000 times more microplastics on the seafloor than in contaminated surface waters, indicating that microplastics are sinking and being consumed by deep-sea creatures.
The ingestion of microplastics has been detected in various marine organisms, including fish, squid, and shrimp, across the Tropical Eastern Pacific and the Galápagos archipelago. Microplastic particles were found in 100% of the water samples and marine life specimens collected in this region. The presence of microplastics in marine organisms is a growing environmental concern, with potential ecological impacts that are not yet fully understood.
The durability of plastic contributes to the persistence of microplastics in the ocean, leading to long-term exposure and ingestion by marine life. High-income countries are major contributors to ocean microplastic pollution, and without immediate changes, the amount of pollution is projected to more than double by 2040. The issue of microplastics in the ocean is a global problem that requires concerted action to reduce plastic pollution entering our waterways and oceans.
The detection of microplastics in marine organisms has become increasingly common, indicating the widespread ingestion of these particles by marine life. The impact of microplastics on marine ecosystems is an emerging field of study, and further research is needed to fully comprehend the ecological harm caused by their presence in the ocean.
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They are difficult to clean up
Microplastics are a significant contributor to ocean plastic pollution. They are plastic particles smaller than 5mm in diameter, and they can come from a variety of sources, including larger plastic debris that degrades into smaller pieces, microbeads in health and beauty products, plastic fibres from synthetic textiles, and plastic pellets used in manufacturing. While there is no standard definition of microplastics, they are commonly defined as plastic particles smaller than 5mm.
Microplastics are difficult to clean up for several reasons. Firstly, they are not uniform in shape, size, or type of plastic, making it challenging to prevent or remove them from the environment. They are also globally distributed in aquatic environments and can be transported long distances, ending up in various places like Mount Everest, the Mariana Trench, Antarctica, and the deep sea. This widespread distribution makes it difficult and costly to remove microplastics from the environment.
Another challenge in cleaning up microplastics is that they can pass through water filtration systems and end up in oceans, lakes, and other water bodies. Even with filtration technology, there are issues of relatively high costs due to membrane fouling and the need to replace filter membranes frequently. Other removal methods, such as adsorption and magnetic separation, may cause secondary pollution, while chemical treatments can leave behind chemical residua.
Furthermore, microplastics can infiltrate marine snowfall, which is one of the primary pathways connecting the ocean's surface and depths. This process can alter the planet's ancient cooling process and contribute to the sinking of plastics to the seafloor, making it even more challenging to remove them from the ocean.
The insidious nature of microplastics, often a byproduct of everyday items, also contributes to the difficulty in cleaning them up. They can be found in items like packing materials, car tires, synthetic clothing, and even some scrubbing face washes. As a result, they can end up in the environment through various pathways, such as the breakdown of plastics or the washing of synthetic textiles.
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Frequently asked questions
Microplastics are plastic particles smaller than 5 millimeters, about the diameter of a standard pencil eraser. They come from a variety of sources, including larger plastic debris that degrades into smaller pieces, microbeads in health and beauty products, plastic pellets, and tire microplastics.
It is difficult to determine the exact percentage of ocean plastic pollution that is microplastics due to the constant fluctuation of plastic debris concentrations in the ocean. However, microplastics make up a significant amount of ocean plastic pollution. In the Great Pacific Garbage Patch, for example, microplastics account for about 8% of the floating plastic mass.
Microplastics are more difficult to clean up than larger plastic debris due to their small size. They can also impact more species as their bioavailability increases. Marine life can mistake microplastics for food, and microplastics have been found in marine organisms, indicating their ingestion by marine life. Additionally, microplastics can alter the ocean's ancient cooling process by infiltrating marine snowfall.
Organizations like The Ocean Cleanup are working to remove plastic objects from the ocean before they break down into microplastics. The Pew Charitable Trusts are also conducting research and raising awareness about the impacts and sources of microplastic pollution. On a global scale, 175 countries adopted a resolution to "End plastic pollution: towards an International legally binding instrument" at the UN Environment Assembly in 2022.
