Meghan Hodges
Marine pollution is a pressing issue that poses a significant threat to the health of marine ecosystems and organisms, as well as human health and economic structures worldwide. It refers to the introduction of harmful substances and waste into the marine environment, primarily from land-based activities. This includes a range of pollutants such as chemicals, trash, nutrient runoff, oil spills, plastic pollution, and noise pollution. The accumulation of these pollutants in the ocean has detrimental effects on marine life, with plastics, chemicals, and noise disrupting the natural communication and migration patterns of marine animals. The impact of marine pollution is far-reaching, and addressing it requires a combination of prevention, cleanup, and regulatory measures to reduce the entry of harmful substances into the ocean.
| 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 | Marine debris, plastic pollution (including microplastics), ocean acidification, nutrient pollution, toxins, underwater noise, chemical pollution, light pollution |
| Sources | Land-based activity (80%), marine transportation, runoff, air pollution, oil spills, industrial waste, agricultural waste, residential waste, sewage, urban wastewater, stormwater, wastewater, fossil fuel burning, aquaculture, domestic waste, timber harvest areas, vehicles, farms, septic tanks, livestock ranches, faulty factories, water treatment systems, shipping, ballast, bilge, fuel tanks |
| Impact | Harm to marine life, human health, economic structures, marine ecosystems, industries, livelihoods |
| Solutions | Prevention, cleanup, regulations, bans on disposable plastic items |
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What You'll Learn
Plastic pollution
Marine plastic pollution is a pressing environmental challenge that threatens the health of our oceans, marine life, the food chain, and human health. It is caused by the relentless production and disposal of plastic materials, with an estimated 11 to 23 million metric tonnes of plastic entering the oceans each year. This plastic pollution ranges from large items such as bottles and bags to microplastics, which are formed from the breakdown of plastic waste.
The impact of plastic pollution on marine life is devastating, with at least 267 species worldwide affected, including sea turtles, seabirds, and marine mammals. Plastic debris can cause entanglement, ingestion, starvation, suffocation, and infection, leading to fatalities. For example, ghost nets, or discarded fishing gear, can entangle and trap marine animals, causing injury and death. Plastic bottle caps have also been found in the stomachs of turtles and seabirds, obstructing their respiratory and digestive tracts.
The sources of marine plastic pollution are primarily land-based activities, accounting for around 98% of the total volume. This includes litter, trash, and debris from urban runoff, construction, ports, marinas, and industrial facilities. The remaining 2% is generated by ocean-based activities, such as discharges from ships and discarded fishing gear.
Addressing plastic pollution is crucial to safeguard marine ecosystems and preserve biodiversity. It requires a combination of prevention and cleanup efforts, as well as a reduction in the use of disposable and single-use plastics. While some countries have enacted regulations to limit or ban disposable plastic items, it is essential for individuals, communities, and governments worldwide to work together to combat this global issue effectively.
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Chemical pollution
Marine pollution is a combination of chemicals and trash, most of which comes from land-based human activities. Chemical contamination, or nutrient pollution, is a significant concern for health, environmental, and economic reasons. This type of pollution occurs when human activities, such as the use of fertilizer on farms, lead to the runoff of chemicals into waterways that eventually flow into the ocean.
The increased concentration of chemicals, such as nitrogen and phosphorus, in the coastal ocean promotes the growth of algal blooms, which can be toxic to marine life and harmful to humans. These algal blooms, also known as "red tides", grow rapidly and produce toxic effects. When these dense blooms die off, their decomposition severely depletes the dissolved oxygen in the water, creating "dead zones" where marine life struggles to survive. This, in turn, impacts fisheries and tourism.
Other sources of chemical pollution include crude oil and other petroleum products, antifoulants, pesticides, pharmaceuticals, and personal care products. Oil spills, for instance, can ensnare and suffocate marine animals by permeating their gills. Even chemicals banned decades ago, like polychlorinated biphenyls (PCBs), are still found in high concentrations in the deep sea.
Nonpoint source pollution, which accounts for a significant portion of marine chemical pollution, is the accumulation of pollution from various small sources that cannot be easily identified. Examples include individual cars, boats, farms, construction sites, septic tanks, and livestock ranches. These sources contribute to the runoff of chemicals and other pollutants into waterways and, ultimately, the ocean.
The consequences of chemical pollution in marine ecosystems are far-reaching, and the problem is growing. The act of chemical pollution occurs when chemicals are washed, blown, or intentionally dumped into the ocean. While some countries are taking action to limit or ban the use of certain disposable plastic items, changing society's approach to plastic use and preventing chemical pollution will be a long and economically challenging process.
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Noise pollution
Marine pollution is a pressing issue, with billions of pounds of trash and other pollutants entering the ocean each year. It is a combination of chemicals and trash, the majority of which comes from human activities along coastlines and far inland.
One form of marine pollution that is often overlooked is noise pollution. Noise pollution is a growing issue in the ocean, with a dramatic increase in recent decades. It is caused by human activities such as global shipping, oil and gas exploration, construction, and naval exercises. The noise created by these activities travels much faster and farther than light underwater, impacting marine life in various ways. Marine mammals, such as whales, dolphins, and porpoises, are highly dependent on sound for survival. They use sound to communicate, locate prey and mates, navigate, and defend their territories.
The complex and interconnected nature of ocean ecosystems means that the effects of noise pollution on one species can have indirect consequences for others. For instance, if a whale strands on a beach due to sudden loud noise, the seafloor-dwelling animals that rely on its carcass for food will lose a vital food source.
To mitigate the impacts of noise pollution on marine life, policies and regulations are needed to reduce propeller noise from ships and mitigate the sounds of sonar equipment, seismic air guns, pile driving, and construction. Quieter technologies should also be developed to improve the ocean soundscape and enable the recovery of marine life.
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Causes and sources of marine pollution
Marine pollution is a combination of chemicals and trash, most of which comes from land sources. Eighty per cent of marine pollution comes from the land, with the remaining twenty per cent largely attributable to marine transportation.
One of the biggest sources of marine pollution is nonpoint source pollution, which occurs as a result of runoff. Nonpoint source pollution includes many small sources, like septic tanks, cars, trucks, and boats, plus larger sources, such as farms, ranches, and forest areas. Millions of motor vehicle engines drop small amounts of oil each day onto roads and parking lots, which eventually make their way to the sea. Some water pollution starts as air pollution, which settles into waterways and oceans. Dirt can be a pollutant, with topsoil or silt from fields or construction sites running off into waterways, harming fish and wildlife habitats.
Another major source of marine pollution is plastic waste, which is particularly problematic as it is so long-lasting. Plastic items can take hundreds of years to decompose. Common types of marine debris include various plastic items like shopping bags, beverage bottles, cigarette butts, bottle caps, food wrappers, and fishing gear. Plastic waste poses dangers to both humans and animals. Fish become tangled and injured in the debris, and some animals mistake items like plastic bags for food and eat them. Small organisms feed on tiny bits of broken-down plastic, called microplastics, and absorb the chemicals from the plastic into their tissues. When small organisms that consume microplastics are eaten by larger animals, the toxic chemicals then become part of their tissues. In this way, the microplastic pollution migrates up the food chain, eventually becoming part of the food that humans eat.
Other sources of marine pollution include oil spills, chemical spills, and the accumulation of dispersed sources, such as fertilizer from yards. Inland mining for copper, gold, etc., is another source of marine pollution, with some of the minerals discharged during mining causing problems for marine life.
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Solutions to marine pollution
Marine pollution is a pressing issue that poses a significant threat to the health of our planet and its ecosystems. It is caused primarily by human activities, with plastic pollution being one of the most prominent issues. Solving this complex problem requires collective efforts and systemic changes. Here are some detailed solutions to address marine pollution:
Reduce Single-Use Plastics and Promote Recycling:
Encourage the use of reusable items, such as bottles, utensils, and shopping bags, instead of single-use plastic alternatives. Promote recycling practices and proper waste management to reduce the amount of plastic entering the ocean. Support organizations like The Ocean Cleanup, which aims to remove 90% of floating ocean plastic by 2040 through river interception and ocean cleanup technologies.
Improve Wastewater Management:
Implement efficient wastewater management systems at a large scale to reduce plastic and nutrient pollution entering the ocean. This includes proper disposal of herbicides, pesticides, and cleaning products to prevent chemical contamination of marine ecosystems.
Educate and Raise Awareness:
Spread awareness about the harmful effects of plastic pollution on marine life and human health. Educate people about the presence of microplastics in cosmetic products and encourage them to avoid purchasing such products. Host documentary screenings and engage in conversations with friends and family to increase awareness and encourage collective action.
Foster Sustainable Practices:
Encourage sustainable seafood choices, reduce water usage to prevent excess runoff, and promote energy efficiency. Support sustainable land-based aquaculture systems to reduce coastal pollution and participate in beach cleanups to remove litter from coastal areas.
Reduce Non-Plastic Pollutants:
Address non-plastic pollutants such as nitrogen, phosphorous, antibiotics, heavy metals, pesticides, and oil and gas debris. Improve coastal zone management by restricting open ocean aquaculture and implementing safe food and water systems to reduce the use of single-use plastic bottles.
By implementing these solutions and working together, we can significantly reduce marine pollution and protect the health of our oceans and the planet.
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Frequently asked questions
Yes, marine pollution is real and is a growing problem in today's world.
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." Marine pollution encompasses many types of pollution, including chemical, light, noise, and plastic pollution.
The majority of marine pollution (80%) comes from land-based activity, including nonpoint source pollution from septic tanks, vehicles, farms, and ranches. Marine transportation also contributes significantly to marine pollution, through ballast, bilge, fuel tanks, and oil spills.
Marine pollution has harmful effects on the environment, the health of organisms, and economic structures worldwide. It can change the physical, chemical, and biological state of the ocean and coastal areas, posing a threat to marine wildlife and ecosystems, as well as industries and livelihoods dependent on them. Marine animals also face entanglement and ingestion of plastic debris, which can lead to injury or death.
Solutions to marine pollution include prevention and cleanup. While cleanup may be challenging or impossible for some items, many countries are taking action to prevent marine pollution. More than sixty countries have enacted regulations to limit or ban the use of disposable plastic items. Additionally, society's approach to plastic use needs to change, and organizations like the National Geographic Society are working to raise awareness and educate the public.
