Greta Jimenez
Oceans cover more than 70% of the Earth's surface and are among the most valuable natural resources, governing the weather, cleaning the air, helping feed the world, and providing a living for millions. However, human activities have led to the ocean's degradation, with marine debris and pollution reaching every corner of the ocean. The majority of pollutants come from human activities along coastlines and far inland, with nonpoint source pollution being the biggest contributor. This type of pollution occurs due to runoff from sources like septic tanks, vehicles, farms, and livestock ranches. Plastic pollution is also a significant issue, with an estimated 170 trillion particles of plastic in the ocean, causing harm to marine life and the environment. Other types of pollution include oil spills, carbon emissions, noise pollution, and agricultural runoff. These pollutants have severe impacts on marine ecosystems, human health, and coastal economies.
| Characteristics | Values |
|---|---|
| Main sources of ocean pollution | Human activities, including nonpoint source pollution and point source pollution |
| Nonpoint source pollution examples | Runoff from septic tanks, vehicles, farms, livestock ranches, timber harvest areas, and other land-based sources |
| Point source pollution examples | Oil spills, chemical spills, faulty factories, and damaged water treatment systems |
| Plastic pollution | Plastic bags, bottles, containers, cutlery, wrappers, synthetic rope, fishing gear, and microplastics |
| Other trash | Derelict fishing gear, abandoned vessels, and general waste |
| Chemical pollution | Carbon emissions, oil leaks, fertilizers, herbicides, insecticides, grease, toxic chemicals, and heavy metals |
| Noise pollution | From shipping and military activity |
| Agricultural pollution | Excess nitrogen and other nutrients leading to algae growth and hypoxic zones |
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What You'll Learn
Plastic pollution
The plastic in the ocean takes various forms, from tiny microplastics smaller than 5mm to larger objects such as buoys, crates, and bottles. These larger objects are constantly fragmenting into smaller pieces, which are much harder to clean up. Microplastics can be ingested by marine life, such as fish and seabirds, and can absorb harmful pollutants like pesticides and dyes, later releasing them into the ocean.
The impact of plastic pollution on marine life is devastating. Seabirds, sea turtles, seals, and other marine mammals are killed each year after ingesting plastic or becoming entangled in it. It is estimated that half of the world's sea turtles have ingested plastic, and plastic ingestion has also affected the reproduction of certain seabird species. Endangered wildlife, such as Hawaiian monk seals, is also among the nearly 700 species that eat and get caught in plastic litter.
The consequences of plastic pollution extend beyond the direct harm to marine life. Plastic pollution can interfere with navigation safety and pose a threat to human health. Heavy metals and other contaminants can accumulate in seafood, making it harmful for human consumption. Additionally, the presence of plastic in the ocean indicates a broader issue with waste management and consumption patterns, particularly in middle-income countries where plastic usage is growing, and inadequate waste management systems struggle to keep up.
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Nonpoint source pollution
Runoff from rain or melting snow can pick up pollutants such as oil, litter, pet waste, fertilizers, pesticides, and sediments as it flows over surfaces like roads, parking lots, and farmland. These pollutants are then carried into streams, lakes, rivers, and eventually the ocean. The sources of nonpoint source pollution are diverse and can include everyday human activities such as driving a car or improperly disposing of waste.
The impact of nonpoint source pollution on coastal communities can be severe. It can affect the beauty and health of coastal lands and waters, driving down property values and deterring tourism. The commercial fishing industry, which is vital to many coastal economies, can also suffer due to nonpoint source pollution. Additionally, nonpoint source pollution can harm marine life and ecosystems, further impacting the environment and human health.
Efforts are being made to address nonpoint source pollution. Organizations like the US Environmental Protection Agency (EPA) and the National Oceanic and Atmospheric Administration (NOAA) have developed programs and initiatives to control and reduce this type of pollution. These include educational resources, fact sheets, and guidelines for both the public and specific industries, such as agriculture and forestry, to help reduce their impact on nonpoint source pollution.
Correcting the harmful effects of nonpoint source pollution can be costly, requiring millions of dollars for restoration and protection measures. However, by working together and implementing control plans, it is possible to mitigate the negative consequences of this significant form of ocean pollution.
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Oil spills
The impacts of oil spills on ecosystems and economies can be long-lasting. One of the industries most affected by oil spills is fishing, with major oil spills frequently resulting in the immediate suspension of commercial fishing to prevent the sale of contaminated seafood. Oil spills can also damage plant life, with saltwater marshes and mangroves being particularly vulnerable. If beaches and populated shorelines are affected, tourism and commerce may suffer, as can power plants and other utilities that depend on seawater.
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Noise pollution
Ocean noise pollution is a form of environmental pollution caused by human activities such as commercial shipping, oil exploration, seismic surveys, offshore wind turbine installation, and military sonar. Cargo ships can emit noise of up to 190 decibels, which is louder than a plane taking off and similar to a rock concert in terms of noise level. Noise pollution can also be caused by recreational boating and energy exploration.
Noise from these activities can travel long distances underwater, increasing noise levels in coastal and offshore habitats. This can negatively impact marine animals and ecosystems. Higher noise levels can reduce the ability of animals to communicate with potential mates, other group members, offspring, or feeding partners. It can also interfere with their ability to hear vital environmental cues for survival, such as avoiding predators, finding food, and navigating to preferred habitats. Marine mammals, such as whales and dolphins, are particularly affected by noise pollution, as they rely on underwater sound as a primary means of communication and assessing their environment.
Ocean noise pollution can also alter the behaviour of marine mammals, driving them away from important feeding or breeding grounds or forcing them to change their migration routes. For example, sudden and intense noise from human activities can cause whales to strand on beaches, resulting in their deaths on land instead of at sea. This, in turn, affects seafloor-dwelling animals that rely on the whale's body as a food source.
Currently, there are no international standards or regulations for addressing ocean noise pollution. However, local governments and individual ports have implemented their own regulations, such as the Port of Vancouver offering discounts to vessels that comply with environmental guidelines. The European Union has also set mandatory thresholds for underwater noise to protect species and habitats. The United Nations Convention on the Law of the Sea (UNCLOS) seeks to prevent and reduce marine pollution from vessels, but it does not specifically address noise pollution.
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Carbon emissions
The burning of fossil fuels has led to higher carbon dioxide levels in the atmosphere, which traps heat that would have otherwise escaped into space. This trapped heat then warms the land, the atmosphere, and the oceans. The warming of the oceans has already resulted in sea-level rise, stronger storms, fisheries moving towards the poles, and the widespread loss of sea ice and glaciers.
Ocean acidification is another significant consequence of carbon emissions. As the oceans absorb more carbon dioxide, their pH levels increase, making the waters more acidic. This change in pH levels has detrimental effects on marine life, particularly shellfish and coral reefs. Shellfish, such as mussels, clams, and oysters, require calcium carbonate to build their shells and skeletons. However, as ocean acidity increases, carbonate levels decrease, threatening the survival of these species. Additionally, more acidic waters contribute to coral reef bleaching and impair the sensory abilities of some fish, impacting their ability to hunt and evade predators.
The impacts of carbon emissions on the oceans are far-reaching and have economic implications as well. For example, the shellfish industry, which is economically important for many coastal communities, could face significant losses due to ocean acidification.
To address these issues, it is crucial to reduce carbon emissions and transition to cleaner energy sources. Efforts such as the development of green shipping corridors and the promotion of renewable energy are essential steps towards mitigating the effects of carbon emissions on the oceans.
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Frequently asked questions
Ocean pollution consists of two main types: chemicals and trash. Chemical contamination, or nutrient 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. Trash, on the other hand, refers to all manufactured products, most of which are plastic, that end up in the ocean due to littering, storm winds, and poor waste management practices.
Chemical pollutants in the ocean can include nitrogen and phosphorus from agricultural runoff, as well as toxic metals, petroleum, industrial wastes, pesticides, and pharmaceutical chemicals. These chemicals can have detrimental effects on marine life and ecosystems, such as promoting the growth of toxic algal blooms and increasing ocean acidification.
Trash pollutants in the ocean can range from microplastics, smaller than 5 mm, to larger items such as derelict fishing gear, abandoned vessels, and single-use plastic items like shopping bags, bottles, and straws. These items can persist in the environment for extended periods, entangling marine life, being ingested by animals, and accumulating in ocean gyres to form massive patches of floating debris.
