Helena Joyce
Ocean pollution is a pressing issue that poses serious threats to marine life, ecosystems, and human health. The leading cause of ocean pollution is plastic waste, with an estimated 170 trillion particles of plastic currently polluting the ocean. Plastic pollution includes items such as bags, bottles, food containers, and fishing gear, which can take hundreds of years to decompose. Other major sources of ocean pollution include nonpoint source pollution, such as runoff from land-based activities like farming and vehicle emissions, as well as point source pollution from oil spills and industrial chemical discharge. Mercury, a toxic metal, is another significant pollutant, released from coal combustion and gold mining. These pollutants have far-reaching consequences, impacting marine life, ecosystems, and the health of humans who consume seafood.
| Characteristics | Values |
|---|---|
| Main type of pollution | Plastic |
| Other types of pollution | Nutrients from fertilizer runoff, nonpoint sources, light, noise, and industrial chemicals |
| Plastic pollution | 170 trillion particles of plastic or 171 trillion microplastics |
| Plastic pollution per person | 21,250 pieces of plastic |
| Plastic pollution weight | 2.3 million tons |
| Plastic pollution examples | Bags, bottles, food containers and cutlery, wrappers, synthetic rope, fishing items, detergent bottles, crates, buoys, combs, water bottles, fishing gear, bottle caps, cigarette butts |
| Plastic pollution patches | The Great Pacific Garbage Patch, The Pacific Garbage Patch, The Western Garbage Patch, The Eastern Garbage Patch |
| Plastic pollution size | 1.6 million square kilometers |
| Plastic pollution effects | Kills precious ecosystems, threatens wildlife, affects human health, harms or kills animals, damages sensitive habitats, interferes with navigation safety |
| Nonpoint source pollution | Occurs as a result of runoff from septic tanks, vehicles, farms, livestock ranches, and timber harvest areas |
| Point source pollution | Occurs as a result of oil or chemical spills, discharge from faulty or damaged factories or water treatment systems |
| Other types of pollution | Dirt, top soil, silt, oil, mercury, light, noise, industrial chemicals, petroleum, urban and industrial wastes, pesticides, fertilizers, pharmaceutical chemicals, agricultural runoff, sewage, |
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What You'll Learn
Plastic pollution
Marine plastic pollution is a significant issue, with plastic accounting for 80% of marine debris. This includes everything from large items like bottles and bags to microplastics, which are formed from the breakdown of plastic waste. While some plastics can be biodegradable, they often require temperatures higher than those found in the ocean to properly break down.
The sources of plastic pollution are varied, with 98% coming from land-based activities and the remaining 2% from sea-based activities. Land-based sources include littering, storm winds, poor waste management, runoff from construction sites, ports, marinas, and industrial facilities, as well as natural events like tsunamis and hurricanes. Sea-based sources include discharges from ships and discarded fishing gear.
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 injury, entanglement, and death through ingestion, starvation, suffocation, infection, and drowning. It can also transport invasive species and pollutants, which are then absorbed by marine life, contaminating the human food chain.
Efforts to combat plastic pollution include regulations enacted by over 60 countries to limit or ban disposable plastic items. Additionally, solutions such as trapping plastic particles at river mouths and cleaning up ocean gyres have been proposed. However, changing society's approach to plastic use will be a long and economically challenging process, and cleanup may be impossible for some items.
Overall, plastic pollution in the ocean is a critical issue that requires a combination of prevention, improved waste management practices, and cleanup solutions to address effectively.
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Nonpoint source pollution
Another significant contributor to nonpoint source pollution is plastic waste. Plastic items, such as shopping bags, beverage bottles, and fishing gear, can take hundreds of years to decompose and pose dangers to both humans and animals. Fish and other marine animals can become entangled or ingest plastic debris, mistaking it for food. Microplastics, tiny broken-down plastic particles, can be ingested by small organisms, which absorb the chemicals into their tissues. These toxins can then move up the food chain, eventually reaching humans through seafood consumption.
To address nonpoint source pollution, organizations like NOAA (National Oceanic and Atmospheric Administration) are developing strategies to control and prevent it. They work with various agencies, including the U.S. Environmental Protection Agency and the Department of Agriculture, to monitor, assess, and limit nonpoint source pollution resulting from natural and human activities. Additionally, NOAA's Coastal Zone Management Program aims to create specific nonpoint source pollution control plans for participating coastal states. These efforts are crucial in mitigating the environmental and economic impacts of nonpoint source pollution on our oceans and coastal communities.
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Light pollution
Marine pollution is a pressing issue, with a wide variety of debris, including microplastics, polluting the ocean. While plastic pollution is a well-known issue, light pollution is another form of pollution that affects the ocean.
Light behaves very differently in the ocean compared to on land, and it plays a crucial role in sustaining life underwater. Sunlight first penetrates the water column, heats it, generates currents, and is then absorbed by photosynthetic organisms such as phytoplankton, algae, and chloroplasts. These organisms convert sunlight into energy through a process called photosynthesis. Sunlight is also essential for some heterotrophic organisms, which incorporate the chloroplasts of ingested algae to obtain energy through a process called kleptoplasty.
The intensity of sunlight decreases as it travels deeper into the ocean, and the depth of the water affects the colours of light that are noticeable underwater. Blue light penetrates farther into seawater, giving the ocean its distinctive colour. At the same time, seawater absorbs red, orange, and yellow wavelengths. As a result, a scuba diver in the open ocean will notice that everything underwater appears in shades of blue.
The amount of energy that penetrates the ocean's surface depends on the angle at which the sunlight strikes the water. Near the equator, the sun's rays strike the ocean almost perpendicularly, resulting in more energy penetration. In contrast, near the poles, the sun's rays strike the ocean at an angle, leading to reduced energy penetration.
While sunlight is vital for many oceanic organisms, certain types of light can be harmful. For example, decreasing ozone levels in the atmosphere can lead to increased UV radiation reaching the Earth, which can be detrimental to phytoplankton and other marine organisms.
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Oil spills
The impact of oil spills on the environment and ecosystems can be devastating and long-lasting. Oil spills harm ocean life in two primary ways: fouling or oiling, and oil toxicity. Fouling or oiling occurs when oil physically harms a plant or animal. For example, oil can coat a bird's wings, rendering it unable to fly, or it can strip away the insulating properties of a sea otter's fur, making it susceptible to hypothermia. The degree of oiling affects the survival chances of the affected animal.
Oil is also toxic and contains various compounds that can cause severe health issues, including heart damage, stunted growth, immune system dysfunction, and even death. Additionally, oil spills can have economic repercussions, impacting industries such as fishing and tourism, as well as power plants and other utilities that rely on seawater.
The cleanup and recovery process after an oil spill is challenging, especially when dealing with wildlife. While some progress has been made in developing scientific solutions to address oil spills, there is still no thoroughly satisfactory method for cleaning up major spills.
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Atmospheric pollution
One of the most severe consequences of atmospheric pollution in the ocean is ocean acidification. This occurs when airborne carbon dioxide (CO2) is absorbed by seawater, triggering chemical reactions that reduce seawater pH. These changes in pH levels can have detrimental effects on various marine organisms, disrupting the delicate balance of the ocean ecosystem.
Another significant source of atmospheric ocean pollution is vessels and ships, which emit exhaust gases into the atmosphere. These emissions contain pollutants such as sulfur oxides and nitrous oxides, contributing to the degradation of air quality and subsequently impacting ocean health. Additionally, ships can discharge pollutants directly into the marine environment, including crude oil spills, which have devastating and long-lasting consequences for marine life and ecosystems.
Nonpoint source pollution is another form of atmospheric ocean pollution. It originates from various sources, such as septic tanks, vehicles, farms, and construction sites. This type of pollution occurs when rain or snow washes pollutants from the ground into the ocean. For example, after a rainstorm, water flowing off roads can carry oil residue left by cars into the ocean. Atmospheric deposition of dirt and debris from nonpoint sources can also occur, further contaminating the ocean surface.
While atmospheric pollution is a significant concern, efforts are being made to address it. Strategies like Carbon Capture and Storage aim to reduce the presence of CO2 in the atmosphere by capturing and storing it in secure reservoirs. Additionally, international measures, such as the London Convention/London Protocol and the OSPAR Convention, regulate the injection of carbon dioxide into sub-seabed geologic formations to mitigate climate change. These initiatives demonstrate a global recognition of the issue and a commitment to finding solutions.
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Frequently asked questions
Plastic is the leading source of ocean pollution. There are an estimated 170 trillion plastic particles in the ocean, which, if gathered, would weigh roughly 2.3 million tons.
Other main types of ocean pollution include nutrients from fertilizer runoff, nonpoint sources, light, noise, and industrial chemicals.
Nonpoint source pollution is the accumulation of pollution from small sources that cannot be exactly pinpointed. Examples include pollution from individual cars, boats, farms, and construction sites.
Ocean pollution is harmful to everything involved. It kills precious ecosystems, threatens wildlife, and has been proven to affect human health.
