Brian Barton
Marine pollution is a pressing issue that poses a threat to the health of marine ecosystems and the economies that depend on them. It is caused by a combination of chemical contamination and physical debris, with plastic pollution being a significant contributor. While the exact percentage of ocean water that is polluted is challenging to determine, it is evident that pollution is widespread and has detrimental effects on marine life and human activities such as fishing and tourism. The sources of marine pollution are diverse, including runoff from land-based sources, atmospheric deposition, oil spills, and the improper disposal of plastic waste. Addressing marine pollution requires collective efforts from governments, industries, and individuals to implement sustainable practices, improve waste management, and reduce the use of harmful substances.
| Characteristics | Values |
|---|---|
| Percentage of ocean water that is polluted | 75 to 199 million tonnes of plastic and waste |
| Percentage of plastic in the ocean that is microplastics | 92% |
| Percentage of fish that contain microplastics | 60% |
| Percentage of fish caught for consumption that contain plastic | 1 in 3 |
| Number of garbage patches in the ocean | 5 |
| Number of dead zones around the world | 405 |
| Size of the largest dead zone | 6,705 square miles |
| Percentage of marine litter that comes from land-based sources | 80% |
| Number of rivers that are accountable for riverine plastic emissions into the ocean | 1,000 |
| Percentage of plastic in the ocean that comes from land-based sources | 70% to 80% |
| Percentage of shellfish-growing waters in the United States that are adversely affected by coastal pollution | More than one-third |
| Percentage of fishery revenue that shellfish vulnerable to ocean acidification make up in the Pacific Northwest | 60% |
| Amount the US shellfish industry could lose annually by 2100 due to ocean acidification | Over $400 million |
| Amount of plastic waste that enters the ocean each year | 33 billion pounds |
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What You'll Learn
Plastic pollution
Plastic takes a long time to biodegrade, with some types of plastic taking up to 450 years to break down. As a result, plastic can persist and accumulate in the ocean for long periods of time. It is estimated that there are now 15 to 51 trillion pieces of plastic in the world's oceans, with plastic pollution reaching every corner of the globe, from the equator to the poles, and from Arctic ice sheets to the seafloor. The most famous example of ocean plastic pollution is the Great Pacific Garbage Patch, located between Hawaii and California. This garbage patch is made up of all kinds of marine debris and contains 1.8 trillion pieces of plastic, covering an area twice the size of Texas.
Rivers are the main source of ocean plastic pollution, with coastal cities in middle-income countries being the world's plastic emissions hotspots. During storms and heavy rain events, plastic emissions can increase tenfold as trash is washed into waterways. In addition to littering and improper waste management, another significant source of plastic pollution in the oceans is industrial fishing, which accounts for about 20% of the ocean's plastic pollution. Buoys, eel traps, crates, nets, and oyster spacers are examples of fishing-related gear found in the Great Pacific Garbage Patch.
The impact of plastic pollution on marine life and ecosystems is devastating. Marine animals can become entangled in plastic debris, leading to injury and mortality, and thousands of seabirds, sea turtles, seals, and other marine mammals are killed each year due to plastic ingestion or entanglement. Microplastics have also become part of the food chain and have been found in drinking water, salt, beer, and soil, posing risks to human health.
Efforts are being made to address the plastic pollution crisis, such as the High Seas Treaty signed by several nations in 2023, which aims to protect 30% of the oceans by 2030. Additionally, California has introduced a law holding plastic packaging producers and vendors responsible for waste, and grassroots organizations and startups are working to reduce ocean-bound plastic. While these initiatives provide some hope, more urgent action is needed to tackle the growing plastic pollution epidemic.
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Non-point source pollution
While I cannot find a precise percentage, non-point source pollution is the biggest cause of ocean pollution. Non-point source pollution occurs when rainfall or snowmelt moves across the ground, picking up pollutants along the way and eventually depositing them into rivers, lakes, coastal waters, and groundwater. This is known as ''runoff' pollution, and it accounts for 80% of marine pollution.
Other sources of non-point source pollution include fertilisers, herbicides, and insecticides used in agriculture, which increase nutrients in the waterways, causing "nutrient pollution" and leading to oxygen depletion in water sources and aquatic dead zones. Improperly managed construction sites can also contribute sediment and waste to runoff. Atmospheric deposition, where water particles mix with carbon dioxide, sulphur dioxide, and nitrogen oxides to form a weak acid, is another source. When it rains, these acidic water particles are released into water sources.
Plastic waste is a significant contributor to marine debris, with an estimated 92% of plastic in the ocean being microplastics. These microplastics are ingested by marine life and can be found in the fish we eat. Runoff from wastewater facilities, agriculture, and the use of fossil fuels can result in nutrient pollution in the oceans, further exacerbating the problem.
The effects of non-point source pollution are far-reaching and detrimental. It can impact the economies and social conditions of coastal communities, particularly those reliant on the commercial fishing industry and tourism. The environmental and aquatic conditions of coastal areas also influence the value of waterfront properties. As a result, excess non-point source pollution can lower the quality of life and drive down property values.
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Chemical contamination
Marine pollution is a combination of chemicals and trash, with 80% of marine litter originating from land-based sources. Chemical contamination, or nutrient pollution, is a significant concern for health, environmental, and economic reasons. Human activities, such as the use of fertilisers on farms, lead to the runoff of chemicals into waterways that eventually flow into the ocean. This increases the concentration of chemicals like nitrogen and phosphorus in coastal areas, promoting the growth of algal blooms that are toxic to marine life and harmful to humans.
Nonpoint source pollution, resulting from runoff, is a major contributor to chemical contamination in the ocean. This includes small sources like septic tanks, vehicles, and boats, as well as larger sources such as farms, ranches, and forest areas. Oil leaks from vehicles, boats, and even lawnmowers contribute to water pollution. Atmospheric deposition, where water particles mix with carbon dioxide, sulphur dioxide, and nitrogen oxides, also leads to chemical contamination in the ocean.
Industrial, agricultural, and municipal wastes eventually find their way into the ocean, introducing toxic chemicals, nutrients, and microplastics. Plastic waste, in particular, is a significant concern, with plastics and microplastics collecting in large "patches" in ocean gyres. The Great Pacific Garbage Patch, for example, is estimated to cover 1.6 million square kilometres. Microplastics, which are tiny plastic particles less than 5 millimetres in diameter, are ingested by small marine organisms and absorbed into their tissues. As these organisms are consumed by larger animals, the toxic chemicals migrate up the food chain, eventually reaching humans.
Chemical discharges from factories, raw sewage overflow from water treatment systems, and stormwater runoff also contribute to marine pollution. The oil and gas industry's routine operations emit toxic by-products and release high levels of greenhouse gases, leading to thousands of spills in U.S. waters annually. The burning of fossil fuels further exacerbates the problem, as the oceans absorb a significant portion of the resulting carbon emissions, leading to increased ocean acidification.
Nutrient pollution is a global issue, with over 700 coastal areas affected by eutrophication. A lack of global water quality monitoring data suggests that nutrient pollution may be even more widespread than currently understood. Mercury and PCBs are among the top pollutants in the ocean, posing risks to human health, including increased cancer risk, cardiovascular disease, and potential damage to nervous systems.
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Nutrient pollution
Agricultural practices contribute heavily to nutrient pollution. Fertilisers, herbicides, and insecticides used in agriculture increase the nutrient levels in waterways, leading to a process known as "nutrient pollution." This, in turn, results in the depletion of oxygen levels in the water, creating "dead zones" where most marine life cannot survive. These dead zones are areas of hypoxia, or low oxygen, and they can lead to the collapse of ecosystems. There are currently close to 500 dead zones globally, with a total surface area of over 245,000 square kilometres. The largest dead zone is located in the Gulf of Mexico and covers an area of 6,705 square miles.
To address the issue of nutrient pollution, a multifaceted approach is necessary. This includes better monitoring of nutrient pollution globally and reducing nutrient inputs into coastal marine ecosystems. Scientists, policymakers, and the public must work together to implement effective strategies. Practical steps that can be taken include restoring habitats such as mangroves and marshes, which act as natural filters, removing nutrients from the water before it reaches the sea. Additionally, implementing ecosystem management plans that consider both watershed areas and the seawater they drain into is crucial.
The consequences of nutrient pollution are severe, and the cost to countries with degraded marine and coastal resources can be significant. Initiatives like the Global Environment Facility (GEF) project aim to provide governments and stakeholders with the foundation to develop comprehensive programmes to address nutrient over-enrichment and oxygen depletion. By taking collective action and following the guidance of experts, we can work towards mitigating the detrimental effects of nutrient pollution on our oceans and the diverse life they support.
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Oil pollution
Oil spills are another highly concentrated source of oil pollution. While they account for only about 12% of the oil in the oceans, they can have devastating impacts on marine life. One example is the Orange County oil spill in Huntington Beach, California, in October 2021, which released 25,000 gallons of oil into the ocean and led to widespread wildlife contamination. Other sources of oil pollution include natural seeps, where oil enters the ocean through fractures or faults in the seafloor, and discharge from oil and gas operations, such as offshore production or commercial vessels.
The impact of oil pollution on marine ecosystems is significant. Oil can coat and harm marine animals, such as seabirds and fish, reducing their ability to move and find food. It can also smother marine habitats, such as coral reefs and mangroves, and contaminate coastal areas, affecting both wildlife and human communities. Oil pollution can have long-lasting effects, with some areas, such as beaches and ocean floors, still bearing the brunt of past oil spills.
Efforts are being made to address and mitigate the impact of oil pollution. For example, the Oiled Wildlife Care Network (OWCN) responds to oil spills and provides care for affected wildlife. Additionally, organizations like The Ocean Cleanup and the Seabin Project are working to remove oil and other pollutants from the oceans. While progress has been made, there is still much to learn about the effects of oil on the marine environment and how to effectively address and reduce oil pollution in the long term.
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Frequently asked questions
It is difficult to say exactly what percentage of ocean water is polluted, but it is clear that pollution is a significant issue for ocean health. The United Nations Environment Program estimates that there is currently 75 to 199 million tonnes of plastic and waste in our oceans, with 33 billion pounds of plastic entering the oceans each year.
The biggest source of ocean pollution is non-point sourcing, which is when rainfall or snowmelt collects pollutants from the ground and deposits them into bodies of water, including the ocean. 80% of marine litter comes from land-based sources, including littering, poorly managed waste facilities, and overflowing landfills and bins.
Ocean pollution has a range of negative effects on the environment, wildlife, and humans. Nutrient pollution, caused by agricultural chemicals, leads to the creation of dead zones in the ocean where there is a lack of oxygen, preventing marine life from living. Marine ecosystems are also affected by the ingestion of plastic by marine life and the entanglement of marine life in plastic waste.
The burning of fossil fuels contributes to ocean pollution by releasing toxins into the ocean and increasing the acidity of the water. As the oceans absorb more carbon emissions, the pH level of the ocean surface increases, leading to acidification.
Various initiatives are being undertaken to address ocean pollution, including The Global Plastic Treaty created by the United Nations Environment Program, which aims to end plastic pollution by 2040. The Ocean Cleanup is another project that uses advanced technology to remove plastic and other waste from the ocean and rivers. Individual actions, such as reducing plastic consumption and organizing local cleanups, are also important in combating ocean pollution.
