Bronte Wells
The Pacific Ocean is the most polluted ocean in the world, with the North Pacific Gyre accounting for one-third of the plastic pollution in all oceans, forming the Great Pacific Garbage Patch. The Indian Ocean is the second most polluted ocean, with 1.3 trillion pieces of plastic, followed by the North Atlantic, South Pacific, South Atlantic, and Mediterranean Sea. While the Southern (Antarctic) and Arctic Oceans are less polluted due to lower human activity, every ocean is affected by pollution, with plastic pollution being a significant issue. The top polluting countries are China and Indonesia, with Asia being the biggest polluter of waterways. The primary sources of oceanic pollution are chemical spills, plastic waste, agricultural runoff, and oil spills, all of which pose serious risks to marine life and ecosystems.
| Characteristics | Values |
|---|---|
| Most polluted ocean | North Pacific Ocean |
| Second most polluted ocean | Indian Ocean |
| Third most polluted ocean | North Atlantic Ocean |
| Fourth most polluted ocean | South Pacific Ocean |
| Fifth most polluted ocean | South Atlantic Ocean |
| Least polluted oceans | South Pacific and South Atlantic Oceans |
| Country that contributes the most to oceanic pollution | China |
| Second biggest contributor to oceanic pollution | Indonesia |
| Third biggest contributor to oceanic pollution | The Philippines |
| Type of pollution | Plastic waste, chemical spills, agricultural runoff, air pollution |
| Plastic pollution in the ocean | 5 trillion pieces |
| Plastic pollution in the ocean (alternative estimate) | 150 million metric tons |
| Amount of plastic added to the ocean annually | 8 million metric tons |
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Plastic pollution
The Indian Ocean is the second-most polluted, with 1.3 trillion pieces of plastic, followed by the North Atlantic (930 billion pieces), the South Pacific (491 billion pieces), the South Atlantic (297 billion pieces), and the Mediterranean Sea (247 billion pieces). The Northern Hemisphere bears the brunt of plastic pollution, with the North Pacific and Indian Oceans containing 56% of all plastic particles.
The plastic in our oceans comes from a variety of sources. Rivers are the primary source, with plastic waste from parks, beaches, and streets being carried into drains, streams, and rivers by wind and rainwater runoff. Once in the rivers, the plastic is transported to the oceans. A significant portion of ocean plastic also comes from fishing gear and damaged or discarded fishing nets, which are often dumped directly into the high seas. Research indicates that about 80% of the plastic in the Great Pacific Garbage Patch originates from fishing activities, with items such as buoys, eel traps, crates, and nets being commonly found.
Mismanaged waste is another critical factor contributing to plastic pollution in the oceans. This refers to waste that is not recycled, incinerated, or properly disposed of in sealed landfills. Low- to middle-income countries often have poorer waste management infrastructure, leading to higher rates of mismanaged waste. Asia, in particular, has been identified as a significant contributor, with 81% of ocean plastic emanating from the continent. The Philippines, India, Malaysia, China, Indonesia, Myanmar, Vietnam, Bangladesh, and Thailand are among the top countries responsible for plastic pollution in the oceans.
While the exact figures may vary, it is estimated that between 1 and 2 million tonnes of plastic enter the oceans annually, with some previous estimates reaching as high as 8 million tonnes. This plastic pollution has severe consequences for marine life, with entanglement and ingestion impacting a large number of species, including over 100 endangered species. The plastic ingested by marine animals can even make its way up the food chain to humans.
International cooperation to address the plastic crisis has gained momentum, with the United Nations Environment Assembly (UNEA) adopting a resolution in 2022 titled "End plastic pollution: towards an International legally binding instrument." This resolution marks the beginning of negotiations for a legally binding instrument to tackle plastic pollution throughout its entire lifecycle, from source to sea. While change may be slow, local and global organizations are actively working towards reducing plastic consumption and cleaning up our oceans.
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Chemical spills
The Deepwater Horizon oil spill in 2010 was the world's largest oil spill, causing an estimated $23 billion in associated costs for affected tourist infrastructure. The Gulf of Mexico, for instance, suffered a $1.9 billion loss in revenue from fishing due to the necessary fishing closures and a decline in demand.
In addition to oil spills, other chemical spills can occur from agricultural runoff, carrying pollutants such as fertilisers, pesticides, herbicides, petrol, and diesel into the water. These spills can enhance the growth of harmful microorganisms, threatening the survival of marine species and damaging fragile ecosystems.
To combat chemical spills, organisations like NOAA's National Ocean Service work to protect and restore coastal resources. They develop tools such as Environmental Sensitivity Maps (ESM) to identify sensitive areas and resources prior to a spill, aiding in the planning of clean-up strategies and restoration efforts.
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Agricultural runoff
Agricultural activities can have far-reaching effects on water quality due to the vast expanse of farmland and the nature of farming practices. The leading sources of agricultural pollution are soil erosion and the use of agrochemicals, such as pesticides, fertilizers, and manure. When rainwater or excess stormwater flows over fields, it picks up these pollutants and transports them into nearby waterways, which can ultimately lead to the oceans.
The pollutants carried by agricultural runoff include fertilizers containing potassium, phosphorus, and nitrogen; pesticides; heavy metals; and animal waste. These contaminants can have severe ecological consequences. For example, fertilizers and manure contribute to toxic algal blooms, which can destroy marine life by blocking sunlight and depleting oxygen. Excess nitrogen in drinking water sources has also been linked to methemoglobinemia, a potentially fatal condition in infants.
The impact of agricultural runoff extends beyond the immediate ecological damage. It also affects human health and economic activities. Contaminated shellfish beds have led to closures, and drinking water sources can be compromised, posing risks to human health. Additionally, the degradation of aquatic ecosystems can disrupt industries that rely on healthy marine environments, such as fishing and tourism.
Addressing agricultural runoff is a complex task that requires a combination of initiatives and practices. Farmers are implementing various methods to reduce runoff, such as contour strip cropping, which helps reduce erosion and mitigate the impact of stormwater runoff. On a broader scale, programs like the National Water Quality Initiative in the United States aim to address agricultural water quality issues and develop strategies to minimize the impact of farming operations on water bodies.
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Air pollution
Marine pollution is a combination of chemicals and trash, most of which comes from human activities along coastlines and far inland. One of the biggest sources of pollution is nonpoint source pollution, which occurs as a result of runoff from farms, septic tanks, vehicles, livestock ranches, and timber harvest areas. This can cause harmful algal blooms, which threaten the survival of other marine species by using up oxygen and blocking out sunlight.
Plastic pollution is a significant issue, with the North Pacific having the highest volume of plastic, followed by the Indian Ocean, the North Atlantic, the South Pacific, the South Atlantic, and the Mediterranean Sea. Plastic waste takes hundreds of years to decompose and poses dangers to both humans and animals. It can entangle marine life and be ingested by fish, whales, turtles, and seabirds.
Oil pollution is another concern, with oil from boats, airplanes, cars, trucks, and even lawnmowers contributing to water pollution. Oil spills and freight tanker accidents can also cause significant ocean pollution.
Noise pollution is also harming marine species, with the constant din of commercial tanker and container ships creating an underwater "smog" that affects the sensory range of marine wildlife.
While the exact ocean with the worst pollution is challenging to determine, the provided information highlights the diverse sources and impacts of ocean pollution, with air pollution being a significant contributing factor.
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Marine debris
The Great Pacific Garbage Patch contains waste from land-based activities in North America and Asia, as well as waste thrown into the ocean by boats and ships. The majority of this waste is fishing nets, which can entangle and kill marine life, as well as endanger human navigation. Marine animals often mistake debris for food or eat it accidentally, leading to injury, illness, suffocation, and death.
Other debris includes plastic bottles and bags, as well as microplastics, which are pieces of plastic smaller than 5mm in length. These microplastics can come from larger pieces of plastic that have broken down, or from microbeads, which are manufactured for use in health and beauty products. Microplastics have been found in nearly all species of marine animals. Marine debris also includes dirt, silt, fertilisers, pesticides, herbicides, petrol, and diesel, which can enter the ocean through rainwater and agricultural runoff.
The NOAA Marine Debris Program works to research, reduce, and prevent marine debris in the US and globally. The program was formalised in 2006 with the Marine Debris Research, Prevention, and Reduction Act. The Act directs NOAA to map, identify, measure impacts, remove, and prevent marine debris. One initiative is the Fishing for Energy program, which offers the fishing community a no-cost way to dispose of old fishing gear. This gear is then transported to an energy facility, where one ton of nets can create enough electricity to power a home for 25 days.
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Frequently asked questions
The North Pacific Ocean is the most polluted ocean in the world. It holds an estimated two trillion pieces of plastic, which is a third of the plastic in all oceans. The Great Pacific Garbage Patch, located between Japan and the United States, is formed by the North Pacific Gyre.
The Indian Ocean is the second most polluted ocean, with 1.3 trillion pieces of plastic. The Indian Ocean Garbage Patch was discovered in 2010 and is caused by the Indian Ocean Gyre.
The South Pacific and South Atlantic Oceans are the least polluted, with 491 billion and 297 billion pieces of plastic respectively. They are located in the Southern Hemisphere, which is less inhabited, and further away from the rivers that contribute to plastic pollution.
