Bronte Wells
Marine life pollution refers to the introduction of harmful substances or energy into marine environments, leading to detrimental effects on marine life, ecosystems, and human industries. It is primarily caused by human activities, with over 80% of pollution originating from land-based sources. This includes plastic pollution, chemical contaminants, sewage, and agricultural runoff. Plastic debris, such as bags, bottles, and fishing gear, entangles marine animals, leading to injuries and death. Microplastics, ingested by marine organisms, accumulate toxins in their tissues, impacting the entire food chain, including humans. Chemical pollution, including crude oil, pesticides, and pharmaceuticals, further degrades marine environments, causing toxic effects on marine life and humans. Addressing marine life pollution requires a combination of prevention, cleanup, and regulatory efforts to reduce the use of disposable plastics and limit chemical runoff.
| Characteristics | Values |
|---|---|
| Definition | "The introduction by man, directly or indirectly, of substances or energy into the marine environment … which results or is likely to result in such deleterious effects as harm to living resources and marine life." (UNCLOS, 1982) |
| Types of Pollutants | Chemicals, trash, noise, nitrogen-phosphorous, sewage, oil, plastic, discarded fishing nets, pesticides, pharmaceuticals, personal care products, heavy metals, industrial discharge, microplastics |
| Sources of Pollutants | Human activities, accidental spills, deliberate dumping, untreated effluent, atmospheric fallout, runoff from drains, septic tanks, vehicles, farms, timber harvest areas, livestock ranches, faulty or damaged factories, water treatment systems, fertilizer from yards, non-organic fertilizers, single-use plastics |
| Effects on Marine Life | Entanglement, ingestion, injury, starvation, suffocation, toxic contamination, death |
| Effects on Humans | Marine pollution can impact human health through the food chain, with toxins building up in fatty tissues of animals that are then consumed by humans, potentially leading to long-term health conditions, cancer, and birth defects |
| Prevention and Cleanup Solutions | Regulations to limit or ban disposable plastic items, reusable bottles and utensils, biodegradable plastics, prevention of plastic leakage, minimising plastic toxicity, improving reusability and recyclability of plastics |
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Plastic pollution
Marine pollution is defined by the 1982 UN Convention on the Law of the Sea as "the introduction by man, directly or indirectly, of substances or energy into the marine environment ... which results or is likely to result in such deleterious effects as harm to living resources and marine life." Plastic pollution is a significant contributor to the degradation of marine life and ecosystems. It encompasses all manufactured plastic products that end up in the ocean, posing dangers to both humans and animals.
Plastics are the most common form of marine debris, with common items including cigarette butts, food wrappers, beverage bottles, straws, cups, plates, bottle caps, and single-use bags. These plastics can have detrimental effects on marine life through entanglement and ingestion. Many marine animals, such as sea turtles, mistake plastic debris for food, leading to choking, internal injuries, and death. Additionally, smaller organisms ingest microplastics, absorbing the chemicals into their tissues.
The impact of plastic pollution extends beyond the immediate harm to marine life. Plastics can persist in the environment for hundreds of years without decomposing, accumulating in huge subtropical oceanic areas called gyres. These gyres, such as the infamous Great Pacific Garbage Patch, can cover vast areas, with the Great Pacific Garbage Patch estimated to be twice the size of Texas. The plastic pollution in these gyres is not a solid mass but rather a "plastic soup," with larger objects continually fragmenting into smaller pieces that are challenging to clean up.
While some countries have taken steps to address plastic pollution, such as enacting regulations to limit or ban disposable plastic items, the problem persists. The production and consumption of plastic continue to increase, with a projected 40% rise in plastic production over the next decade. This growing crisis demands urgent action, including improved waste management, reduced plastic usage, and advocacy for the regulation of plastics as hazardous pollutants.
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Chemical pollution
Marine pollution is defined by the 1982 UN Convention on the Law of the Sea as "the introduction by man, directly or indirectly, of substances or energy into the marine environment ... which results or is likely to result in such deleterious effects as harm to living resources and marine life." Chemical pollution is one of the three significant forms of oceanic and coastal pollution, along with nitrogen-phosphorus pollution and sewage.
Another example of chemical pollution is plastic pollution, which is a rapidly increasing component of ocean pollution. Plastic waste contains manufactured chemicals such as phthalates, bisphenol A, flame retardants, and perfluorinated chemicals, which are released into the seas when plastic breaks down into microplastics and nanoplastics. These chemicals can enter the tissues of marine organisms, including those consumed by humans, and have been linked to various health issues. For instance, exposures of infants in utero to these pollutants through maternal consumption of contaminated seafood can damage developing brains, reduce IQ, and increase the risk of autism, ADHD, and learning disorders. In adults, exposure to methylmercury increases the risk of cardiovascular disease and dementia.
The total amount of chemicals entering the ocean rose by 12% between 2003 and 2012, with a 50% increase in the Pacific during this period. While the level of chemical pollution from North America and Europe dropped by 60%, the rise in other regions has led to an overall increase in chemical pollution in the ocean. This is particularly concerning as chemical pollution can have detrimental effects on ocean health and marine life, as well as impact human health through the food chain.
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Oil spills
Marine pollution is defined by the 1982 UN Convention on the Law of the Sea as "the introduction by man, directly or indirectly, of substances or energy into the marine environment … which results or is likely to result in such deleterious effects as harm to living resources and marine life." It includes a combination of chemicals and trash, most of which comes from human activities along the coastlines and far inland.
Light oils, such as gasoline and diesel, are highly toxic and can ignite or explode. They can kill animals and plants on contact or through inhalation of fumes. Medium oils will persist in the environment for varying amounts of time and have different levels of toxicity. Heavy oils, like bunker oils used to fuel ships, are less acutely toxic but can persist in the environment for months or years if not removed. They can smother small organisms and have been linked to chronic health issues such as tumors.
Additionally, juvenile sea turtles can become trapped in oil and mistake it for food. Oil can contaminate shellfish and corals, making them unsafe for human consumption. Oil spills can also have indirect effects, such as disrupting the food chain and impacting human industries and livelihoods dependent on marine resources, including fisheries and tourism.
While oil spills have decreased due to improved technologies and policies, they remain a significant threat to marine life. Specialists and veterinarians are trained to deal with oiled wildlife, cleaning, rehabilitating, and returning them to their environment. However, preventing and mitigating the impacts of oil spills on marine ecosystems remains a challenging task.
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Agricultural pollution
Marine pollution is defined by the 1982 UN Convention on the Law of the Sea as "the introduction by man, directly or indirectly, of substances or energy into the marine environment … which results or is likely to result in such deleterious effects as harm to living resources and marine life."
One of the most significant impacts of agricultural pollution on marine life is nutrient pollution, particularly from excess nitrogen and phosphorus. These nutrients can enter water bodies through runoff from farms carrying manure and fertilizer, as well as from untreated sewage. When present in high concentrations, nitrogen and phosphorus can stimulate the overgrowth of algae, leading to harmful algal blooms (HABs) or "red tides." As algae die off and decompose, they consume oxygen, creating "`dead zones` where oxygen levels are too low to support marine life. This process can also block sunlight from reaching underwater plants, further disrupting marine ecosystems.
Farming practices can also result in physical pollution in marine environments. Plastic waste from agriculture, such as discarded farming equipment and packaging, can find its way into oceans, harming marine life that may ingest or become entangled in the debris.
To mitigate the impacts of agricultural pollution on marine life, farmers can adopt sustainable practices. This includes implementing fertilizer best practices, regenerative agriculture strategies, and erosion control measures to reduce nutrient runoff. Additionally, improving waste and pollution management practices in the aquaculture sector can help reduce the harmful effects of agricultural pollution on marine ecosystems.
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Noise pollution
Marine life pollution refers to the introduction of substances or energy into the marine environment, which can result in harmful effects on marine life and ecosystems. One significant form of marine pollution is noise pollution, which has increased dramatically in recent decades. This type of pollution is particularly damaging to marine wildlife as many species depend on sound for their survival.
Another source of noise pollution in the ocean is the use of sonar equipment and seismic air guns. Sonar has been recorded to alter the feeding behaviour of endangered blue whales. Even at much lower sound levels than military sonars, blue whales have been observed to stop feeding, increase their swimming speed, and move away from the sound source. Additionally, loud noises can cause immediate damage such as hearing loss in marine mammals, which can prove fatal when sound is one of their main tools for survival.
To reduce noise pollution in the marine environment, policies and regulations are needed to mitigate propeller noise from ships, sonar equipment, seismic air guns, pile driving, and construction. Quieter technologies also need to be developed to make it easier to reduce noise pollution. These actions can improve the ocean soundscape and potentially enable the recovery of some marine life. Scientific research and education also play a pivotal role in protecting marine ecosystems from noise pollution, with organisations like the Oceans Research Institute offering comprehensive marine biology training to address these environmental challenges.
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Frequently asked questions
Marine life pollution is defined by the 1982 UN Convention on the Law of the Sea as "the introduction by man, directly or indirectly, of substances or energy into the marine environment … which results or is likely to result in such deleterious effects as harm to living resources and marine life."
Marine life pollution comes in many forms, from toxic chemicals, sewage, fertilisers, and noise pollution to plastics, oil spills, and discarded fishing nets. Over 80% of it originates from human activities on land, whether due to accidental spills, deliberate dumping, untreated effluent, atmospheric fallout, or the runoff from drains.
Marine life pollution has a detrimental impact on marine wildlife in several ways. Plastic pollution, for example, can entangle and injure marine animals, or be ingested, leading to suffocation, starvation, or toxic contamination. Microplastics, in particular, are consumed by small organisms, which are then eaten by larger predators, transferring toxins up the food chain and ultimately affecting human health. Additionally, oil spills and chemical pollutants can have harmful effects on marine life, altering the physical, chemical, and biological state of the ocean and coastal areas.
