Bronte Wells
Marine debris is a persistent pollution problem that reaches throughout the entire ocean and Great Lakes. Eighty percent of marine pollution comes from land, with plastic waste making up 80% of all marine pollution. Between 8 and 10 million metric tons of plastic end up in the ocean each year, with billions of pounds of trash and other pollutants entering the ocean annually. While this constitutes less than 0.5% of the world's plastic waste, the problem is far from small, with over 1 million metric tons of plastic polluting the ocean each year.
| Characteristics | Values |
|---|---|
| Percentage of marine pollution that comes from land-based sources | 80% |
| Main sources of land-based marine pollution | Nonpoint source pollution, oil from boats, airplanes, cars, trucks, lawn mowers, chemical discharges from factories, raw sewage overflow, stormwater and agricultural runoff |
| Percentage of marine pollution caused by single-use plastics | 49% |
| Amount of plastic litter that ends up in the environment every year | 20 million metric tons |
| Amount of plastic that ends up in the ocean each year | 8-10 million metric tons |
| Amount of plastic in the ocean | 50-75 trillion pieces |
| Percentage of global plastic leakage to the environment that was macro-plastics in 2019 | 88% |
| Examples of macro-plastics | Bottles, caps, cigarettes, shopping bags, cups, straws, fishing gear, paint shed from shipping |
| Examples of micro-plastics | Synthetic textiles, tyres |
| Impact of micro-plastics on marine animals | Enters the food chain, ingested by fish and other species, enters tissues |
| Impact of marine pollution on humans | Affects the body's endocrine system, causes developmental, neurological, reproductive and immune disorders, heavy metals and other contaminants can accumulate in seafood |
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What You'll Learn
- Marine debris: 80% of marine pollution is plastic waste, which harms marine life and ecosystems
- Land-based sources: Pollution from littering, poor waste management, and runoff enters oceans via storm drains and sewers
- Nonpoint source pollution: Runoff from farms, vehicles, and boats contributes to ocean pollution
- Air pollution: Carbon emissions from fossil fuels are absorbed by oceans, increasing water acidity
- Oil pollution: Oil from boats, planes, and vehicles pollutes the ocean, harming marine life and ecosystems
Marine debris: 80% of marine pollution is plastic waste, which harms marine life and ecosystems
Marine debris is a persistent pollution problem that affects the entire ocean and the Great Lakes. Eighty percent of marine pollution is plastic waste, which enters the ocean from land-based sources, including those far inland. This waste comes from littering, poor waste management practices, storm water discharge, and extreme natural events such as hurricanes and tsunamis. Oil from boats, planes, cars, trucks, and lawnmowers also contributes to water pollution, as do chemical discharges from factories, raw sewage overflow, and agricultural runoff.
Plastic waste in the ocean has severe consequences for marine life and ecosystems. It can harm or kill animals when ingested or when they become entangled in it. It also threatens marine habitats and interferes with navigation safety. Microplastics, in particular, have become part of the food chain and have been found in drinking water, salt, beer, and soil. They can cause developmental, neurological, reproductive, and immune disorders in humans and animals.
The presence of plastic in the ocean is increasing, despite growing awareness of the hazards it poses. This is due to the rapid growth in global plastic production, with annual production doubling in the last two decades. While rich countries produce the most plastic waste per person, mismanagement of waste is a more significant factor in plastic pollution, and this tends to be higher in low-to-middle-income countries due to poorer waste management infrastructure.
To address this issue, it is crucial to improve waste management practices and implement recycling. It is also essential to reconsider the design and usage of disposable packaging and reduce the manufacturing of unnecessary single-use plastics. By taking these steps, we can not only save marine species and ecosystems but also improve our overall health and the environment, helping to fight climate change.
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Land-based sources: Pollution from littering, poor waste management, and runoff enters oceans via storm drains and sewers
Eighty percent of marine pollution comes from land-based sources. These sources include littering, poor waste management, and runoff, which enter oceans via storm drains and sewers.
Littering is a significant contributor to marine pollution. Plastic debris, such as discarded plastic bottles, can end up in the ocean, posing a serious threat to marine life and ecosystems. Deliberate waste disposal at sea, known as ocean dumping, further exacerbates the problem. Abandoned fishing gear, for example, can trap and kill species, damage habitats, and interfere with current fishing practices.
Poor waste management practices also play a role in marine pollution. Inefficient waste management methods, such as inadequate sewage systems, can lead to sewage overflow and the discharge of untreated waste into water bodies, including the ocean. Septic systems may fail due to aging infrastructure, overloading, or poor maintenance, resulting in pollution over time.
Runoff is another major source of pollution. Stormwater runoff carries a toxic mix of pollutants, including fertilizer, pesticides, oil, and other contaminants from streets, yards, and hard surfaces in urban and suburban areas. When rainwater and snowmelt run off these surfaces, they pick up these pollutants and carry them into local rivers and streams, ultimately affecting water quality and aquatic life. Oil leaks and spills from vehicles and ships also contribute significantly to runoff pollution, with oil making its way into the ocean through sewer and drain systems.
Nonpoint source pollution, which includes runoff, is a significant issue. It originates from various small and large sources, such as septic tanks, vehicles, farms, and forest areas. These sources release pollutants like oil, dirt, and chemical residues into waterways, which eventually reach the ocean.
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Nonpoint source pollution: Runoff from farms, vehicles, and boats contributes to ocean pollution
Eighty percent of marine pollution comes from land-based sources, including those far inland. One of the biggest sources of this pollution is nonpoint source pollution, which occurs as a result of runoff from farms, vehicles, and boats. This type of pollution includes many small sources that are difficult to pinpoint, such as individual cars, boats, and septic tanks, as well as larger sources, like farms, ranches, and construction sites.
Nonpoint source pollution is a significant contributor to ocean pollution. For example, millions of motor vehicle engines leak small amounts of oil onto roads and parking lots every day, which then gets washed into the ocean during rainstorms. Similarly, dirt, topsoil, or silt from fields or construction sites can run off into waterways, harming fish and wildlife habitats and making river and ocean water unsafe for humans and wildlife. In some areas, this pollution is so severe that beaches have to be closed after heavy rainfall.
Farms are another major contributor to nonpoint source pollution. Agricultural operations can contaminate water through the use of pesticides, nutrients in fertilizer, and livestock manure. These contaminants can be carried into local streams, rivers, and groundwater through runoff, infiltration, and irrigation return flows. To address this issue, farmers are adopting practices such as drip irrigation, storing livestock manure in protected areas, and implementing on-farm conservation systems to reduce and control runoff.
Additionally, boats and ships also contribute to nonpoint source pollution in the ocean. Oil leaks from boats and ships can pollute the water, and abandoned vessels can become marine debris. The constant noise from commercial ships and Navy sonar testing creates an underwater "smog" that interferes with the sensory range of marine wildlife.
Correcting the harmful effects of nonpoint source pollution is costly, requiring millions of dollars to be spent on restoration and protection efforts. Agencies like NOAA and the US Environmental Protection Agency are working to develop ways to control and reduce this type of pollution.
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Air pollution: Carbon emissions from fossil fuels are absorbed by oceans, increasing water acidity
While it is difficult to ascertain exactly how much pollution ends up on land versus in the sea, it is estimated that 80% of marine pollution comes from land-based sources. These include littering, poor waste management, storm water discharge, and natural events such as hurricanes and tsunamis. Marine debris, such as microplastics, derelict fishing gear, and abandoned vessels, is a persistent problem that reaches throughout the entire ocean and Great Lakes.
Nonpoint source pollution, which includes runoff from septic tanks, vehicles, farms, and forest areas, is one of the biggest sources of marine pollution. This type of pollution can make rivers and oceans unsafe for both humans and wildlife, and it can even cause beaches to be closed after rainstorms.
However, the focus of this discussion is on air pollution and its effects on the oceans. Air pollution, specifically carbon emissions from burning fossil fuels, contributes significantly to increasing water acidity in the oceans. Oceans absorb a significant portion of the carbon dioxide (CO2) released into the atmosphere, estimated at around one-third to one-quarter of all human-induced CO2. As atmospheric CO2 levels rise due to human activities, the amount of CO2 absorbed by the oceans also increases.
When carbon dioxide dissolves in seawater, it forms carbonic acid (H2CO3), releasing hydrogen ions (H+) and increasing ocean acidity. This process leads to a decrease in the pH of seawater, making it more acidic. The pH scale is a measure of how acidic or basic a substance is, with 7 being neutral, lower values acidic, and higher values basic. The increased acidity has far-reaching implications for marine life, particularly for organisms that rely on calcium to develop and maintain their shells and skeletons, such as plankton, oysters, crabs, and shrimp.
The effects of ocean acidification are already being observed, with studies indicating that the shellfish industry could face significant economic losses due to the increased difficulty in maintaining calcified structures. Additionally, the changing chemistry of seawater poses a threat to marine ecosystems and the coastal economies that depend on them. If greenhouse gas emissions continue to rise, the surface waters of the ocean are projected to become even more acidic, with potential consequences for a wide range of marine organisms.
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Oil pollution: Oil from boats, planes, and vehicles pollutes the ocean, harming marine life and ecosystems
Oceans cover more than 70% of the Earth's surface, making them the planet's most valuable natural resource. They govern the weather, clean the air, help feed the world, and provide a living for millions. However, human activities have severely harmed marine ecosystems. While some pollution is dumped directly into the sea, it is estimated that 80% of marine waste comes from land-based sources, including those far inland. Oil pollution from boats, planes, and vehicles is a significant contributor to this issue.
The aviation industry accounts for 7.8% of global oil consumption, while maritime shipping accounts for 6.7%. The number of air passengers is increasing, with aviation energy consumption growing faster than that of the shipping industry. Oil consumption by these industries has various environmental impacts. For example, in the hunt for offshore oil and gas, ships fire compressed air into the water, disrupting the vital behaviours of endangered whales.
Additionally, cruise ships emit black carbon, with a warming effect on the climate thought to be up to 1,500 times stronger than that of CO2. Port cities throughout Europe have been affected by high levels of sulfur oxides generated by ships. While some boats and ships are less polluting than planes, such as ferries, all watercraft can be highly polluting, depending on factors like fuel type and efficiency. Marine diesel generates 21.24 pounds of CO2 per gallon of fuel.
Oil pollution from boats can also have severe consequences. All waterways are vulnerable to pollution, from small accidental spills to major incidents. Even small quantities of oil can cause lasting problems for wildlife, as oil is toxic to fish and other aquatic life. Oil pollution can be prevented by keeping boat fuel and oil out of the water.
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Frequently asked questions
It is estimated that 80% of marine pollution comes from land.
Nonpoint source pollution, which includes runoff from small sources like septic tanks, cars, trucks, and boats, as well as larger sources such as farms, ranches, and forest areas.
It is estimated that between 1 million and 1.7 million metric tons of plastic end up in the ocean each year, with billions of pounds of trash and other pollutants entering the ocean annually.
Plastic pollution in the ocean comes from thousands of sources worldwide, with rivers being the main transporters of plastic from land to sea.
Plastic pollution in the ocean has damaged the environment, human health, and economies. It has also led to the extinction of marine species, health problems for humans and animals, and the destruction of ecosystems.
