Helena Joyce
The ocean is Earth's life support, regulating our climate and providing protein for over a billion people. However, human intervention is causing serious and irreparable damage to marine life and the ocean's ecosystem. Plastic pollution is a significant contributor, with an estimated 8 million pieces of plastic entering our oceans daily. This has led to plastic accounting for up to 90% of marine pollution, with plastic waste expected to outweigh fish in the sea by 2050. The impact of this pollution is evident, with over 100 million marine animals dying each year and almost 1000 species affected. The crisis is further exacerbated by chemical pollution and mismanaged waste, resulting in dead zones where marine life cannot exist. The crisis is not limited to a specific area, as studies indicate that not one square mile of surface ocean is free from plastic pollution.
| Characteristics | Values |
|---|---|
| Percentage of ocean surface polluted by plastic waste | 88% |
| Amount of plastic in the ocean | 5.25 trillion pieces of plastic waste |
| Amount of plastic in the ocean (by weight) | 75-199 million tons |
| Amount of plastic entering the ocean each year | 8 million tons |
| Amount of plastic entering the ocean each year (by weight) | 12.7 million tons |
| Percentage of plastic waste that is recycled | 9% |
| Percentage of plastic waste that is incinerated | 12% |
| Percentage of plastic waste that ends up in landfills or the ocean | 79% |
| Number of marine animals impacted by ocean pollution | Over 100,000 marine animals |
| Number of marine bird species impacted by ocean pollution | 60% |
| Number of dead zones in the ocean due to pollution | Over 500 |
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What You'll Learn
Plastic waste is the leading cause of ocean pollution
Plastic waste is a global crisis. Billions of pounds of plastic can be found in swirling convergences that make up about 40% of the world's ocean surfaces. There is so much plastic in the ocean that, at current rates, it is expected to outweigh all the fish in the sea by 2050. This plastic pollution has a direct and deadly effect on wildlife. Marine animals mistake microplastics for food, causing internal injuries and death. Tragically, research indicates that half of the world's sea turtles have ingested plastic. Marine mammals also get tangled up in plastic, and it is estimated that 60% of all seabird species have eaten plastic, with that number predicted to increase to 99% by 2050.
The plastic crisis is a result of the overwhelming rise in the production of disposable plastic products. In the last decade, more plastic was produced than in the entire history of plastic production up to the year 2000. The fossil fuel industry plans to increase plastic production by 40% over the next decade, which will only exacerbate the problem.
The plastic in the ocean comes from plastic waste that is not recycled, incinerated, or kept in sealed landfills. This mismanaged plastic waste enters the ocean from rivers, which act as conveyor belts, picking up more trash as they move downstream. Once in the ocean, it is difficult, if not impossible, to retrieve plastic waste. Mechanical systems can be effective at picking up large pieces of plastic from inland waters, but once plastics break down into microplastics, they are virtually impossible to recover.
The best way to reduce plastic pollution is to improve the management of plastic waste, especially in poorer countries, where most ocean plastics come from. Rich countries produce the most plastic waste per person, but plastic pollution is highest in low-to-middle-income countries due to poorer waste management infrastructure.
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Marine life is severely impacted by plastic pollution
Ingestion of plastic by marine animals can lead to choking, internal injuries, and starvation. Research indicates that half of the sea turtles worldwide have ingested plastic, mistaking it for food or consuming it unknowingly. This issue is not limited to sea turtles, as studies show that 60% of all seabird species have eaten plastic, with the number predicted to increase to 99% by 2050. Marine mammals, such as seals, are also affected, with endangered species like Hawaiian monk seals falling victim to plastic ingestion and entanglement.
Plastic pollution also acts as a vector for toxic chemicals, accumulating persistent organic pollutants (POPs) and heavy metals as it travels up the food chain, ultimately reaching humans who consume seafood. This indirect pathway of pollution infiltration poses a significant threat to marine food webs, impacting organisms from zooplankton to apex predators. The economic costs of plastic pollution are substantial, with estimates of around $13 billion annually for tourism, shipping, and fishing industries alone.
The impact of plastic pollution extends beyond the immediate harm to individual marine animals. It contributes to the decay of the ocean's ecosystem, resulting in over 100 million marine animal deaths each year. Additionally, plastic pollution has affected the reproduction of some marine species, further threatening their populations.
The magnitude of plastic pollution in our oceans is evident, with not one square mile of surface ocean anywhere on Earth free from it. As plastic takes 500-1000 years to degrade, the problem is persistent and far-reaching. The crisis is expected to worsen, with predictions that plastic will outweigh fish in the oceans by 2050. Addressing this issue requires comprehensive strategies at local, national, and global levels, including reducing plastic use, enhancing waste management, and advocating for policy changes.
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The Great Pacific Garbage Patch is the most polluted area
The Great Pacific Garbage Patch, also known as the Pacific trash vortex, is the largest accumulation of plastic in the open ocean. It spans waters from the West Coast of North America to Japan. The patch is made up of the Western Garbage Patch, located near Japan, and the Eastern Garbage Patch, located between Hawai'i and California. These areas of spinning debris are linked by the North Pacific Subtropical Convergence Zone, a few hundred kilometres north of Hawai'i. This zone acts as a highway, moving debris from one patch to another. The entire Great Pacific Garbage Patch is bounded by the North Pacific Subtropical Gyre, a large system of swirling ocean currents.
The Great Pacific Garbage Patch formed gradually as a result of ocean or marine pollution gathered by ocean currents. The gyre's rotational pattern draws in waste material from across the North Pacific, incorporating coastal waters off North America and Japan. The wind-driven surface currents then gradually move debris towards the centre, trapping it. The area in the centre of a gyre tends to be very calm and stable, and because much of the debris is not biodegradable, the amount of debris in the patch accumulates over time.
The size of the patch is determined by sampling, and estimates place it at 1,600,000 square kilometres (about twice the size of Texas or three times the size of France). However, there is no standard for determining the boundary between "normal" and "elevated" levels of pollutants, so the size estimates are conjectural. The patch is not a solid mass of trash floating on the ocean, but plastic pollution is densely distributed within it. The buoyant plastic mass is distributed within the top few metres of the ocean, and larger pieces resurface much more rapidly than smaller pieces.
The Great Pacific Garbage Patch poses risks to the safety and health of marine animals, as well as health and economic implications for humans. Marine animals mistake plastic for food, leading to malnutrition, entanglement, and threats to their overall behaviour, health, and existence. Studies have shown that about 900 species have encountered marine debris, and 92% of these interactions are with plastic. 17% of the affected species are on the IUCN Red List of Threatened Species. Floating at the surface of the Great Pacific Garbage Patch is 180 times more plastic than marine life, and animals migrating through or inhabiting this area are likely consuming plastic.
The best way to clean up the Great Pacific Garbage Patch is to limit or eliminate the use of disposable plastics and increase the use of biodegradable resources. Organisations such as the Plastic Pollution Coalition and the Plastic Oceans Foundation are using social media and direct action campaigns to support individuals, manufacturers, and businesses in their transition from toxic, disposable plastics to biodegradable or reusable materials.
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Rivers are the main source of ocean plastic pollution
Plastic pollution in the ocean is a growing crisis. It is estimated that there are 15–51 trillion pieces of plastic in the oceans, with some estimates suggesting 5.25 trillion pieces. This plastic pollution is deadly to marine wildlife, with thousands of sea birds, turtles, seals, and other marine mammals killed each year from ingestion or entanglement. Almost 1000 species of marine animals are impacted by ocean pollution, and there are over 500 locations recorded as dead zones where marine life cannot exist.
A significant portion of the plastic in the oceans comes from land-based sources, and rivers are a major contributor. It is estimated that 70% to 80% of plastic in the oceans is transported from land to sea via rivers or coastlines. The remaining 20% to 30% comes from marine sources such as fishing nets, lines, ropes, and abandoned vessels.
A recent study found that more than a quarter of all plastic waste in the oceans could be coming from just 10 rivers, eight of them in Asia. These rivers are the Yangtze, Yellow, Hai, Pearl, Amur, Mekong, Indus, and Ganges Delta in Asia, and the Niger and Nile in Africa. The Pasig River in the Philippines alone accounts for 6.4% of global river plastics. These rivers are major contributors due to a combination of factors, including large river basins with large populations and poor waste management practices.
To address the issue of river plastic pollution, organizations like The Ocean Cleanup are developing solutions such as the Interceptor to prevent plastic from entering the oceans. Additionally, better waste collection and management practices in polluted regions, as well as raising public awareness, are crucial steps in mitigating river plastic pollution.
While focusing on mitigating plastic pollution from a few rivers may not be sufficient, addressing the issue at the source is vital. This includes implementing nonpoint source pollution control plans, improving waste management practices, and prioritizing regions likely to emit plastic into the ocean based on factors such as population proximity to rivers, distance to the ocean, and types of land use.
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Mismanaged waste is a significant contributor to ocean pollution
While it is difficult to ascertain the exact percentage of the ocean that is polluted, it is evident that plastic pollution in the ocean has become a global crisis. Marine life is suffering irreparable damage from the chemical pollution of the waters and the millions of tons of mismanaged waste dumped in the oceans each year. Mismanaged waste is a significant contributor to this crisis, with plastic being a key culprit.
Mismanaged waste refers to plastic waste that is not recycled, incinerated, or disposed of in sealed landfills. Instead, it ends up in rivers and oceans, contributing to the growing pollution crisis. This mismanagement is particularly prevalent in low-to-middle-income countries, where plastic consumption is increasing, and adequate waste management systems are lacking. For instance, in 2024, it was estimated that 69.5 million tons of plastic waste would be mismanaged and end up in the natural environment.
The consequences of mismanaged waste are dire for marine life. Plastic pollution has a direct and deadly impact on wildlife, with thousands of seabirds, sea turtles, seals, and other marine mammals killed each year due to ingestion or entanglement. By 2050, plastic pollution is expected to outweigh fish in the sea, with plastic set to invade the food chain.
The sources of mismanaged waste are varied and widespread. One significant source is runoff pollution, which occurs when contaminants from land, such as litter, poor waste management practices, and stormwater discharge, make their way into the ocean. Another source is ocean-based debris, such as derelict fishing gear and abandoned vessels, which can continue to entangle and kill wildlife.
Addressing the issue of mismanaged waste is crucial to mitigating ocean pollution. This involves improving waste management practices, particularly in lower-income countries, and reducing plastic consumption and production. Organizations like The Ocean Cleanup are working to identify sources of mismanaged waste and develop effective cleanup operations, but systemic changes are also necessary. Domestic policies and foreign investments in waste management infrastructure can play a crucial role in tackling this global issue.
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Frequently asked questions
It is estimated that 88% of the sea's surface is polluted by plastic waste. Billions of pounds of plastic can be found in swirling convergences that make up about 40% of the world's ocean surfaces.
Eighty percent of marine pollution comes from land-based sources. Rivers are the main source of ocean plastic pollution, with 95% of plastic waste in the oceans coming from the top 10 most polluting rivers.
Marine life is suffering irreparable damage from the chemical pollution of the waters and the millions of tons of mismanaged waste dumped in the oceans each year. Over 100 million marine animals die from plastic pollution every year. Plastic ingestion reduces the storage volume of the stomach, causing starvation in marine animals.
The Center for Biological Diversity has petitioned the Environmental Protection Agency to begin regulating plastics as a pollutant and is working to stop plastic pollution at the source. The Ocean Cleanup removes plastic objects from the ocean while they are still at a larger 'macroplastic' size to prevent them from breaking into microplastics.
