Omar Khalid
Plastic waste in the ocean is a pressing global issue, with an estimated 11 million metric tons of plastic entering our oceans each year, threatening marine life and ecosystems. The primary cause of this pollution is littering, with disposable plastic items such as bags and bottles ending up in waterways and eventually the ocean. Mismanaged waste, particularly in middle-income countries, also contributes significantly to the problem. To combat this issue, organizations like Ocean Cleanup are employing innovative technologies, such as large floating net-like barriers, to collect and recycle plastic waste from the ocean. Additionally, there is a growing focus on reducing plastic consumption, improving waste management practices, and advocating for policies that promote recycling and sustainable alternatives. While individual behavior changes are important, systemic changes are also necessary to address the root causes of plastic waste in our oceans.
| Characteristics | Values |
|---|---|
| Amount of plastic in the ocean | 11 million metric tons of plastic enter the ocean each year, in addition to the 200 million metric tons already circulating |
| Impact on marine life | Marine life is affected by plastic waste, with animals suffering from suffocation, entanglement, laceration, infections, and internal injuries |
| Plastic as a food source | Plastic debris groups up in garbage patches, becoming a primary food source for organisms in the region |
| Microplastics | Microplastics are a product of improper manufacturing processes and contribute to ocean plastic pollution |
| Mismanaged waste | Mismanaged waste, which is not recycled, incinerated, or stored in sealed landfills, is a major source of ocean plastic pollution, especially in low-to-middle-income countries |
| Rivers | 1000 rivers worldwide contribute to almost 80% of ocean plastic emissions |
| Coastal impact | Coastal environments, fishing, and tourism industries are affected by plastic pollution, with high cleanup costs for coastal communities |
| Individual behavior | Changing individual behaviors and habits is important, but also insufficient; supporting legislation to reduce plastic use and improve recycling facilities is crucial |
| Cleanup technologies | While cleanup technologies exist, such as Ocean Cleanup's system, systemic changes like banning single-use plastics and improving recycling infrastructure are necessary |
| Waste management | Implementing waste collection and management practices can address ocean plastic pollution and improve public health and economic growth |
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Mismanaged waste
About 8 million metric tons of plastic entered the ocean in 2010, and the problem is only growing. While plastic waste is a global issue, it is particularly acute in low-to-middle-income countries, which have poorer waste management infrastructure. As a result, most plastic flowing into the ocean today comes from middle-income countries, especially in Asia.
The probability that mismanaged plastic waste enters the ocean varies depending on factors such as the location and length of river systems, proximity to coastlines, terrain, and precipitation patterns. Streams and storm drains can carry plastic debris directly into the ocean or Great Lakes. Additionally, microplastics, which can be produced as small plastics or come from larger plastics breaking down, are also a significant source of ocean plastic pollution.
To address the issue of mismanaged waste, it is crucial to improve waste management strategies, especially in poorer countries. This includes investing in better waste management infrastructures and collection technologies, as well as controlling consumer demand and material innovation. Local and global organizations, companies, and initiatives are working to clean up and prevent plastic pollution, but it is a complex and ongoing challenge.
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Plastic entering rivers
Plastic waste entering rivers is a significant contributor to ocean plastic pollution. Rivers are the main pathway for plastic waste to travel from land to the ocean. The majority of plastic in the ocean originates from rivers.
There are several factors that contribute to plastic entering rivers. One key factor is improper waste management. When plastic waste is not recycled, incinerated, or disposed of properly, it can end up in rivers and eventually make its way downstream to the ocean. This issue is particularly prevalent in low-to-middle-income countries, which tend to have poorer waste management infrastructure. As a result, these countries contribute the most ocean plastic pollution, despite consuming less plastic overall.
Another factor is the proximity of rivers to populated areas. Rivers that flow through highly populated regions, such as the Yangtze, Indus, Ganges, and Nile, are more likely to have higher levels of plastic waste due to increased waste generation and improper disposal. Additionally, the characteristics of rivers, such as width, depth, flow speed, and tides, can impact the amount of plastic that enters and is carried by the river.
The plastic waste in rivers comes from a variety of sources, including littering, single-use plastics, microplastics from personal care products, and derelict fishing gear. Once in the river, plastic debris can be carried out to sea, where it can cause harm to marine life and ecosystems.
Efforts to reduce plastic entering rivers include improving waste management practices, raising public awareness, and implementing river cleanup technologies such as interceptors and booms. These interventions aim to stop plastic from reaching the ocean and mitigate the environmental and economic impacts of plastic pollution.
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Improper disposal
Rainwater and wind carry plastic waste from streets into streams, rivers, and drains, which ultimately lead to the ocean. In addition, many products that people use daily, such as wet wipes, cotton buds, and sanitary products, are flushed down toilets. Microfibres are also released into waterways when clothes are washed in washing machines. These microfibres are too small to be filtered out by wastewater plants, so they end up being consumed by small marine species and eventually enter our food chain.
Another consequence of improper plastic disposal is the impact on marine life. Marine mammals, such as whales, seals, and sea lions, ingest plastic or become entangled in it, leading to injury and mortality. For example, packing bands have been the most common entangling material for the endangered Steller sea lion. Dead seabirds have also been found with stomachs full of plastic. Furthermore, plastic debris has been found in the habitats of critically endangered Hawaiian monk seals, including areas that serve as pup nurseries.
The improper disposal of plastic waste is particularly prevalent in low-to-middle-income countries due to poorer waste management infrastructure. Middle-income countries, especially across Asia, are the world's plastic emissions hotspots, as they have rapidly growing economies and increasing plastic consumption. However, even in high-income countries with effective waste management systems, improper disposal of plastic waste occurs. To address this global crisis, it is essential to improve waste management systems, implement recycling, reduce the manufacturing of unnecessary single-use plastics, and reconsider the design and usage of disposable packaging.
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Marine debris
Plastics are the most common form of marine debris, accounting for about 80% of all marine litter. They can come from a variety of land and ocean-based sources and impact the ocean and other waterways. Once in the water, plastic debris does not fully biodegrade and can remain in the environment indefinitely, causing harm to marine ecosystems. Microplastics, which can be formed from larger plastics breaking down or produced as small plastics such as microbeads, are particularly harmful as they can be ingested by marine life and accumulate in the food chain.
The majority of plastic in the ocean enters through rivers, with the Great Pacific Garbage Patch being an exception. The sources of plastic pollution are diverse, with a significant proportion originating from middle-income countries, particularly in Asia, where plastic consumption is increasing and waste management systems are inadequate. Improper waste management, including littering, dumping, container spillages, and landfill waste, contributes significantly to the problem.
Addressing marine debris requires a comprehensive approach. The NOAA Marine Debris Program in the United States works to prevent debris from entering the ocean, remove existing debris, conduct research, and respond to disaster-related debris. This includes supporting community-based removal projects, such as local shoreline cleanups, and providing guidance to stakeholders. Internationally, laws and policies have been adopted to reduce marine pollution, with the UN's Sustainable Development Goal 14 aiming to reduce marine pollution.
While the problem of marine debris is significant, there are efforts to address it through cleanup operations, research, education, and policy changes. By improving waste management practices, raising awareness, and collaborating globally, it is possible to mitigate the impact of marine debris and work towards healthier marine ecosystems.
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Microplastics
One method to remove microplastics from aquatic environments is through adsorption and removal technologies. Recent studies have shown that enrichment technologies have been effective in removing microplastics from natural freshwater environments, drinking water treatment plants (DWTPs), and wastewater treatment plants (WWTPs). Photocatalytic technology, in particular, has been highly efficient in pre-degrading microplastics.
Another approach is the use of membrane bioreactors, which have achieved higher microplastics removal efficiency. This technology is more costly and energy-intensive than traditional sedimentation tanks but is valuable when space constraints are present. Coagulation and flocculation are additional techniques where chemical coagulants are added to water to neutralize the surface charges of microplastics, making them easier to remove through sedimentation or filtration.
Certain marine organisms, such as corals, have been observed to remove microplastics through ingestion and adhesion to their surfaces. However, this only migrates microplastics within the food chain, potentially reaching humans as higher trophic organisms prey on these marine organisms. Therefore, while marine organisms can provide insights into removal methods, they do not effectively remove microplastics from the marine environment.
While the research on removing microplastics from the ocean is ongoing, the UN passed a resolution in December 2017, urging members to prioritize policies that prevent marine litter and microplastics from entering the marine environment, recognizing the critical need to address this global issue.
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Frequently asked questions
While it is difficult to determine the exact amount of plastic waste in the oceans, it is estimated that about 8 million metric tons of plastic entered the ocean in 2010. More recent studies suggest that the number is between 1 and 2 million tons per year.
Plastic waste enters the ocean through a variety of sources and pathways. One of the main sources is plastic pollution from land, which can be carried by streams, rivers, and storm drains into the ocean. Other sources include littering, improper waste disposal, and plastic waste from marine sources, such as fishing gear and microplastics from personal care products.
Organizations like Ocean Conservancy and The Ocean Cleanup are dedicated to cleaning up plastic waste from the ocean and preventing further pollution. They work on identifying sources of plastic pollution, tracking levels of pollution, and optimizing solutions. Additionally, local and global initiatives, such as the International Coastal Cleanup®, also contribute to the removal of plastic waste from oceans and beaches.
