Brian Barton
Ocean pollution is a pressing issue that poses a threat to marine life, coastal communities, and ecosystems. The majority of ocean pollution originates from human activities along coastlines and far inland. Nonpoint source pollution, which includes runoff from farms, septic tanks, vehicles, and livestock ranches, is a significant contributor. Plastic pollution, primarily from land-based sources, is a major concern, with rivers being a key pathway for plastic to enter the oceans. Air pollution, fertilizer runoff, oil spills, and marine debris such as derelict fishing gear and abandoned vessels also contribute to the degradation of ocean health. Addressing these diverse sources of pollution requires a combination of improved waste management practices, ecological forecasting, and collaborative efforts between governments, corporations, and the scientific community.
| Characteristics | Values |
|---|---|
| Source of ocean pollution | Human activities along coastlines and far inland |
| Biggest source of ocean pollution | Nonpoint source pollution, which occurs as a result of runoff |
| Nonpoint source pollution | Septic tanks, vehicles, farms, livestock ranches, timber harvest areas |
| Point source pollution | Oil or chemical spills, discharge from faulty or damaged factories or water treatment systems |
| Marine debris | Microplastics, derelict fishing gear, abandoned vessels |
| Marine debris origin | Land-based sources, littering, poor waste management practices, storm water discharge, extreme natural events |
| Marine debris percentage | 80% of all marine debris is plastic |
| Top ocean pollutants | Plastic, nutrients from fertilizer runoff, nonpoint sources, light, noise, industrial chemicals |
| Plastic in oceans | 70% to 80% transported from land to sea via rivers or coastlines |
| Plastic in oceans from marine sources | 20% to 30% from sources like fishing nets, lines, ropes, abandoned vessels |
| Top countries emitting plastic pollutants | Philippines, India, Malaysia, China, Brazil |
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What You'll Learn
Rivers
The probability of a river carrying plastic waste is influenced by various factors such as plastic waste management, land use, wind, precipitation, and the river's size and location. Mismanaged plastic waste, for example, is more likely to enter the ocean in countries like the Philippines, Malaysia, and Sri Lanka. This is due to a combination of factors, including population density, proximity to the coast, and inadequate waste management infrastructure.
Rich countries, on the other hand, contribute relatively little plastic pollution per capita, despite higher plastic consumption. This is because they have better waste management systems in place. To effectively tackle plastic pollution, it is crucial to prioritize improving waste management practices in low-to-middle-income countries.
To address riverine pollution, organizations like NOAA's Coastal Zone Management Program and The Ocean Cleanup are developing strategies and technologies to control and mitigate pollution from rivers to oceans. These efforts include creating nonpoint source pollution control plans, tracking down specific pollution causes, and implementing solutions like the Interceptor™ to prevent plastic from entering oceans through rivers.
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Land-based sources
The majority of ocean pollutants originate from human activities along coastlines and far inland. These land-based sources account for 70% to 80% of plastic pollution in the ocean, with the remaining 20% to 30% coming from marine sources. Rivers are a significant pathway for plastic waste to enter the oceans, with an estimated 1000 rivers responsible for nearly 80% of global riverine plastic emissions. These rivers, particularly smaller urban rivers, act as highways, transporting plastic from land to the sea.
The top ocean pollutants from land-based sources include plastic bags, bottles, food containers, cutlery, wrappers, synthetic rope, and fishing items. These items are often carried by wind and rainwater runoff into storm drains, streams, and rivers, eventually making their way to the ocean. Plastic pollution poses a severe threat to marine life, with animals mistaking plastic for food and becoming entangled in derelict fishing gear.
Fertilizer runoff is another significant land-based source of ocean pollution. Excess nutrients, usually nitrogen and phosphorus, enter bodies of water and act as fertilizers, causing excessive algae growth. This restricts sunlight and oxygen from reaching aquatic plants, leading to their decay and creating "dead zones" devoid of marine life. Fertilizer runoff originates from agricultural practices and wastewater generated from lawns and yards.
Nonpoint source pollution, which occurs due to runoff from various sources, is also a significant land-based contributor to ocean pollution. This type of pollution can come from septic tanks, vehicles, farms, livestock ranches, timber harvest areas, and construction sites. It can harm fish and wildlife habitats and make river and ocean water unsafe for humans and marine life.
Additionally, land-based sources of ocean pollution include littering, poor waste management practices, and stormwater discharge. Extreme natural events, such as tsunamis and hurricanes, can also contribute to ocean pollution by disrupting human systems and infrastructure.
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Human activities
Rivers play a crucial role in carrying plastic waste into the oceans, with a small number of rivers contributing disproportionately to the problem. It is estimated that 1000 rivers are responsible for nearly 80% of global annual riverine plastic emissions, with Asia being home to most of the world's largest emitting rivers. The Pasig River in the Philippines alone contributes 6.4% of global river plastics. The high levels of plastic pollution in Asia are attributed to a combination of factors, including population size, waste management practices, and economic factors.
In addition to plastic pollution, other human activities contribute to ocean pollution through nonpoint source pollution and point source pollution. Nonpoint source pollution arises from runoff from sources such as septic tanks, vehicles, farms, livestock ranches, and timber harvest areas. This type of pollution can make rivers and oceans unsafe for both humans and wildlife, leading to beach closures and adverse effects on shellfish-growing waters. Point source pollution, on the other hand, occurs from single sources such as oil or chemical spills, or faulty factories and water treatment systems.
Nutrient pollution is another significant issue caused by human activities. Excess nutrients, usually nitrogen and phosphorus, enter bodies of water from agricultural runoff or wastewater generated from lawns, acting as fertilizers. This leads to excessive algae growth, which restricts sunlight and oxygen from reaching aquatic plants, creating "dead zones" for marine life.
Marine debris, including microplastics, derelict fishing gear, and abandoned vessels, also originates from human activities, primarily on land. Poor waste management practices, littering, and extreme natural events contribute to the accumulation of marine debris, which can entangle or be ingested by marine animals, damage habitats, and interfere with navigation safety.
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Air pollution
While human activities along coastlines and far inland are the primary sources of ocean pollution, some water pollution starts as air pollution. Atmospheric transport is a significant factor in the movement of manufactured chemicals from land-based sources to the sea. Persistent organic compounds, such as PCBs and fluorinated compounds, volatilize at equatorial and temporal latitudes, then move poleward in the atmosphere before precipitating into water in cooler polar regions. This phenomenon, known as "atmospheric distillation," results in high concentrations of persistent pollutants in marine life.
Nonpoint source pollution, which accounts for a large portion of ocean pollution, can also be attributed to air pollution. This type of pollution arises from various sources, including individual cars, boats, farms, and construction sites. For example, after a heavy rainstorm, rainwater can wash oil left on streets by vehicles into the ocean. Additionally, wind can carry dirt and debris from nonpoint sources and deposit them on the ocean's surface.
The fossil fuel industry's plans to increase plastic production will likely exacerbate the situation, leading to more toxic air pollution and, consequently, more plastic in our oceans. Plastic pollution has already reached crisis levels, with an estimated 15 to 51 trillion pieces of plastic in the world's oceans. This plastic pollution is not limited to any specific area, as it spans from the equator to the poles and from the Arctic ice sheets to the seafloor.
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Marine debris
The largest source of marine debris is plastic, which accounts for around 80% of all marine debris. Plastic accumulates because it does not biodegrade quickly, unlike natural or organic materials. Marine debris also includes other materials such as metals, rubber, paper, textiles, derelict fishing gear, and other lost or discarded items. Some of the most common and harmful types of marine plastic debris include cigarette butts, plastic bags, and food wrappers.
A significant amount of marine debris comes from land-based sources, with 70-80% of plastic transported from land to sea via rivers or coastlines. A 2014 study estimated that there were 5.25 trillion pieces of plastic weighing 269,000 tons dispersed in the oceans. The remaining 20-30% of plastic comes from marine sources such as fishing nets, lines, ropes, and abandoned vessels. Rivers are a major contributor to plastic waste in the oceans, with an estimated 1000 rivers responsible for nearly 80% of global annual riverine plastic emissions. Asia is the largest contributor to ocean plastic emissions, with 81% of ocean plastics emitted from the region.
To tackle the problem of marine debris, various efforts are being made, including international laws and policies, community-based removal projects, and education initiatives. The NOAA Marine Debris Program, for example, works to prevent debris from entering the ocean and supports removal projects across the United States.
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Frequently asked questions
Most ocean pollution comes from human activities along the coastlines and far inland. The majority of plastic in the ocean comes from land-based sources, such as litter in parks, beaches, or storm drains, which is then carried into rivers and, eventually, the ocean.
The top ocean pollutants are plastic bags, plastic bottles, food containers and cutlery, wrappers, synthetic rope, and fishing items. Other types of ocean pollution include noise, light, and industrial chemicals.
Ocean pollution is harmful to marine ecosystems, wildlife, and human health. Marine debris can harm or kill animals when ingested or cause entanglement, threatening their habitats. It can also interfere with navigation safety.
