Bronte Wells
Ocean pollution is a significant environmental issue that poses a threat to the health of our planet. Oceans account for 70% of the surface of the Earth and play a pivotal role in the health of our ecosystem, including human health. Billions of pounds of trash and other pollutants enter our oceans every year, with 80% of this pollution originating on land and caused by human activity. This includes nonpoint source pollution, which occurs as a result of runoff from septic tanks, vehicles, farms, and livestock ranches, and point source pollution, which comes from a single source such as an oil or chemical spill. Plastic pollution is a major contributor, with plastic debris found everywhere from beaches to the deepest ocean trenches. The impact of ocean pollution is far-reaching, from altering the underwater acoustic landscape and harming marine life to negative health outcomes in humans.
| Characteristics | Values |
|---|---|
| Percentage of pollution from land | 80% |
| Main sources of pollution | Nonpoint source pollution, point source pollution |
| Nonpoint source pollution examples | Septic tanks, vehicles, farms, livestock ranches, timber harvest areas |
| Point source pollution examples | Oil spills, chemical spills, faulty factories, damaged water treatment systems |
| Percentage of plastic in ocean pollution | 8 million metric tons |
| Plastic pollution sources | Indonesia, India, United States |
| Plastic pollution hotspots | Coastal cities in middle-income countries |
| Plastic pollution in waterbodies | 1000 rivers worldwide |
| Plastic pollution in oceans | 171 trillion plastic particles |
| Plastic pollution weight | 2.3 million tons |
| Plastic pollution effects | Entangling marine life, ingestion by marine life, environmental pollution |
| Ocean pollution effects | Negative health outcomes in humans and marine ecosystems, harm to marine life |
| Ocean acidification causes | Greenhouse emissions, carbon emissions |
| Ocean noise pollution sources | Shipping, military activity |
| Ocean noise pollution effects | Cellular damage to invertebrates, harm to marine species |
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What You'll Learn
Sources of ocean pollution
The ocean is a vital part of the health and well-being of our planet, covering 70% of the Earth's surface. However, it is facing significant threats from pollution, with billions of pounds of trash and other pollutants entering the ocean annually.
One of the primary sources of ocean pollution is nonpoint source pollution, which arises from various small and large sources and accounts for 80% of marine pollution. This includes runoff from farms, septic tanks, vehicles, and other land-based activities. For example, oils and chemicals from vehicles, farms, and urban areas can wash into the ocean during rain or snow, polluting the water and harming marine life.
Another significant contributor to ocean pollution is plastic waste. Plastic pollution is the accumulation of synthetic plastic products, such as bottles, containers, and bags, which do not biodegrade. Instead, they break down into smaller pieces called microplastics, which can last for centuries. Plastic waste often ends up in the ocean due to littering, poor waste management, and natural disasters like hurricanes and tsunamis.
Ocean-based sources also play a role in pollution. The maritime industry, including shipping and fishing activities, can contribute to pollution through crude oil spills and the abandonment of vessels and fishing gear. Deep-sea mining and drilling for resources like cobalt and gold create harmful sulfide deposits and disrupt marine ecosystems.
Additionally, sewage, industrial waste, and carbon dioxide from burning fossil fuels are other sources of ocean pollution. These pollutants can have detrimental effects on marine life, human health, and the ecosystem as a whole.
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Plastic pollution
Human activities play a significant role in the proliferation of plastic pollution in our oceans. Over-consumption, the use of single-use plastics, inadequate recycling practices, and poor waste management contribute to the ever-growing plastic crisis. The impact of plastic pollution on marine life is devastating, with an estimated 100,000 marine mammals and over 1 million seabirds killed annually due to plastic ingestion or entanglement. Alarmingly, 100% of baby sea turtles have plastics in their stomachs, and over 700 species are on the brink of extinction, including Hawaiian monk seals and loggerhead sea turtles.
The Great Pacific Garbage Patch, located in the North Pacific Ocean between Hawaii and California, is a stark example of the consequences of plastic pollution. This garbage patch spans approximately 1.6 million square kilometers, making it larger than the state of Texas. It is estimated to contain around 100 million kilograms of plastic, including 1.8 trillion pieces larger than 0.5 mm. The plastic waste in this patch is not concentrated in one solid mass but is often described as a "plastic soup."
Addressing plastic pollution requires a multifaceted approach. Implementing proper waste management systems and promoting recycling practices are crucial steps. Additionally, reducing over-consumption and transitioning away from single-use plastics can help mitigate the influx of plastic waste into our oceans. By recognizing the severity of plastic pollution and taking collective action, we can strive to protect marine life, ecosystems, and the health of our planet.
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Oil spills
In addition to the ecological impact, oil spills can have significant economic consequences. If beaches and populated shorelines are affected, tourism and commerce may suffer. Power plants and other utilities that rely on seawater may also be disrupted. The cleanup and restoration costs of oil spills can be substantial, and those responsible can be held accountable for funding these projects under the Oil Pollution Act of 1990.
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Noise pollution
One of the major sources of ocean noise pollution is shipping. Globally, just 15% of the shipping fleet accounts for half of the noise emissions caused by shipping. With shipping increasing massively in recent decades—up to 90% of internationally traded goods are now transported by sea—ocean noise pollution has doubled every decade since the 1960s. In European waters, noise levels doubled within just 5 years between 2014 and 2019. The bigger and faster a ship is, the louder it is, and the constant noise generated by vessels can cause "masking" of communication in marine mammals. For example, fin whales stop singing when noise levels are too high, and vessel noise has been linked to increased stress levels in right whales.
Another significant contributor to ocean noise pollution is the use of seismic airguns by the petroleum industry. These airguns are used in the search for oil and gas deposits in the seabed and are among the loudest sources of noise in the ocean, emitting highly intense noise blasts of up to 260 decibels every 10 to 15 seconds. The sound from these airguns can travel hundreds or even thousands of meters, penetrating up to a hundred kilometers deep into the seabed. This not only disrupts the communication of marine animals but can also drive them away or even kill them, increasing background noise levels by a factor of a hundred over a radius of 300,000 square kilometers.
Military activities are also a major source of ocean noise pollution. The use of sonar, for example, has been recorded to alter the feeding behavior of endangered blue whales. Even at sound levels much lower than those of military sonars, blue whales stopped feeding, increased their swimming speed, and moved away from the sound source.
To mitigate the impacts of ocean noise pollution, there have been calls for policies to reduce propeller noise from ships and the mitigation of sonar equipment noise, seismic airguns, pile driving, and construction. Reducing the speed of the global shipping fleet by 10-20% would significantly reduce noise emissions and have additional environmental benefits, such as reduced CO2 emissions and a lower risk of collisions with whales. International bodies, such as the International Ocean Noise Coalition (IONC) and the International Maritime Organization (IMO), are working to raise awareness, advocate for precautions, and develop guidelines for reducing noise emissions from shipping.
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Chemical contamination
Marine pollution is a pressing issue, with the ocean subjected to various chemical contaminants that have severe ecological, economic, and health implications. Chemical contamination, also known as nutrient pollution, is primarily caused by human activities, such as the use of fertilisers on farms, resulting in the runoff of chemicals into waterways that eventually reach the ocean. This process, known as nonpoint source pollution, accounts for a significant portion of chemical contaminants entering the ocean.
Nonpoint source pollution arises from various sources, including septic tanks, vehicles, farms, livestock ranches, and timber harvest areas. The runoff from these sources contains chemicals such as nitrogen and phosphorus, which promote the growth of algal blooms. These algal blooms can be toxic to marine life and harmful to humans, impacting local fishing and tourism industries. Additionally, nonpoint source pollution can make water unsafe for humans and wildlife, sometimes leading to beach closures after rainstorms.
Another form of chemical contamination in the ocean is point source pollution, which originates from a single source, such as an oil or chemical spill. While less frequent, these incidents can have significant impacts on the marine environment. Industrial discharges, including pharmaceutical wastes, pesticides, and sewage, contribute to the decline in fish stocks and the presence of toxic chemicals in seafood.
Microplastics also play a significant role in chemical contamination. As plastic breaks down into smaller pieces, it releases chemicals that further contaminate the sea. These microplastics are ingested by marine organisms, allowing the chemicals to enter their tissues. As smaller organisms are consumed by larger ones, these toxic chemicals accumulate in the food chain, eventually reaching humans.
Furthermore, certain chemicals, such as perfluoroalkyl substances (PFAS), have been extensively used in manufacturing, leading to widespread contamination of surface waters and groundwater. PFAS compounds have been detected in substantial quantities in the oceans, becoming incorporated into the marine food chain. Other chemical pollutants, such as methylmercury and PCBs, are known for their detrimental effects on human health, impacting infant brain development and increasing the risk of various disorders.
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Frequently asked questions
Ocean pollution, also called marine pollution, is a mixture of both chemical contamination and trash. The majority of pollutants that make their way into the ocean come from human activities along coastlines and far inland.
There are two types of sources of ocean pollution: nonpoint source pollution and point source pollution. Nonpoint source pollution is the accumulation of pollution from small sources that can’t be exactly pinpointed. Examples include pollution from individual cars, boats, farms, septic tanks, and construction sites. Point source pollution is pollution from a single source, like an oil or chemical spill.
Ocean pollution has degraded the health of our oceans at an alarming rate and has been tied to negative health outcomes in human health and marine ecosystems. Noise pollution generated by shipping and military activity can cause cellular damage to jellyfish, anemones, and other invertebrates. Ocean acidification, caused by greenhouse emissions, makes it difficult for bivalves such as mussels, clams, and oysters to form shells, decreasing their likelihood of survival and impacting the food chain. Microplastics can be ingested by fish and other species, and heavy metals and other contaminants can accumulate in seafood, making it harmful for humans to consume.
