Bronte Wells
Marine pollution is a critical issue that poses a grave threat to the health of our planet and its ecosystems. Oceans cover 70% of the Earth's surface and are the origin of all life on the planet. Unfortunately, they are now inundated with various pollutants, the most prevalent of which is plastic. Plastic pollution in the ocean is a significant problem, with at least 14 million tons of plastic ending up in the ocean each year, constituting 80% of all marine debris. This plastic debris includes items such as bags, bottles, containers, and microplastics, which can take up to 20 years to decompose. Marine animals often mistake plastic for food, leading to serious harm and even death. Aside from plastic, other major sources of ocean pollution include chemical runoff, crude oil spills, nutrient pollution, and noise pollution from shipping and industrial activities. These pollutants have far-reaching consequences, impacting both human health and marine life.
| Characteristics | Values |
|---|---|
| Leading cause of ocean pollution | Plastic |
| Plastic products that are the top ocean pollutants | Plastic bags, plastic bottles, food containers and cutlery, wrappers, synthetic rope, and fishing items |
| Amount of plastic dumped into the ocean each year | 14 million tons |
| Percentage of marine debris that is plastic | 80% |
| Amount of plastic microfibers in the ocean | 4 billion per square kilometer |
| Amount of ocean garbage resting on the seafloor | 14 million metric tons |
| Other types of ocean pollution | Chemical contamination, nutrient pollution, noise pollution, industrial pollution, oil spills |
| Percentage of oil in oceans from oil spills | 12% |
| Example of a large oil spill | 2010 Deepwater Horizon well blowout in the Gulf of Mexico, which spilled 134 million gallons of oil |
| Type of pollution that accounts for most of the oil in the oceans | Oil runoff from roads, rivers, and drainpipes |
| Type of pollution that occurs when excess nutrients enter bodies of water | Nutrient pollution |
| Nutrients that cause high levels of algae growth | Nitrogen and Phosphorus |
| Number of dead zones in the world | 415 |
| Largest dead zone | Arabian Sea, covering the entire Gulf of Oman, with an area of 165,000 square kilometers |
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Plastic pollution
The majority of plastic pollution in the ocean comes from land-based activities (98%), with the remaining 2% coming from sea-based sources. Urban runoff, including litter, trash, and debris from construction, ports, marinas, and industrial facilities, is the primary contributor to land-based plastic pollution. Ocean-based sources include discharges from ships and discarded fishing gear.
The impact of plastic pollution on marine life is devastating. It has affected at least 267 species worldwide, including sea turtles, seabirds, and marine mammals. Ingestion of plastic debris is a significant issue, with plastic fragments found in the stomachs of turtles, seabirds, and fish. This ingestion can lead to obstruction of respiratory and digestive tracts, starvation, and infection. Plastic pollution also acts as a transport mechanism for invasive species and pollutants, further endangering marine life and contaminating the human food chain.
Addressing plastic pollution requires a multifaceted approach. Reducing the use of single-use plastics and disposable products is essential, as most plastics are not recycled. Educational initiatives, such as the NOAA Marine Debris Program, play a crucial role in raising awareness and promoting individual action. Additionally, implementing control plans for coastal states and exploring solutions for trapping plastic particles before they enter the ocean are vital steps in mitigating this global issue.
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Noise pollution
The loudest underwater noise comes from naval sonar devices, which emit signals with an intensity of up to 240 decibels. Cargo ships can emit as much as 190 decibels of noise, which is much louder than a plane taking off and about the same noise level as a rock concert. Globally, just about 15% of the global fleet accounts for half of the noise emissions into the ocean caused by shipping. Other sources of ocean noise pollution include port construction work, setting up and operating offshore oil and gas drilling platforms, fisheries, and employing fisheries' acoustic devices to scare away marine mammals from nets.
Ocean noise emissions can be constant or continuous, as generated by vessels, or impulsive (explosive), as by air guns used by the petroleum industry when searching for fossil fuels in the seabed, or in military activities. Sound travels almost five times faster in seawater than in the air, and marine animals are highly dependent on underwater sound. Visibility is often low underwater, so sound has evolved as an important sensory signal for marine wildlife, particularly for marine mammals such as whales, dolphins, and porpoises. They rely on sound to communicate, locate mates and prey, avoid predators, navigate, and even defend their territories.
When consistent unnatural noise masks these calls, it becomes harder for the animals to hear and find each other, coordinate hunts, and detect and warn others about predators. Ocean noise is especially problematic for animals that rely on echolocation, like dolphins and toothed whales. Noise pollution can also cause temporary or permanent hearing loss, behavioural and physiological changes, masking – the ability to detect sound being overlapped or covered by another sound, injury, and even death.
To reduce anthropogenic noise in the marine environment, policies must be implemented to reduce propeller noise from ships and mitigate the sounds of sonar equipment, seismic air guns, pile driving, and construction. The development of quieter technologies will also make it easier to reduce noise pollution. These actions can improve the ocean soundscape and potentially enable the recovery of some marine life.
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Nutrient pollution
The sources of nutrient pollution are diverse and interconnected. Firstly, agricultural activities, including the use of fertilisers, manure, and runoff from fields, contribute significantly to the problem. Additionally, human sewage and wastewater generated from lawns and other urban areas contain high levels of nutrients that eventually make their way into water bodies. Industrial activities, such as burning fossil fuels, also release nitrogen-containing compounds, further exacerbating nutrient pollution.
The consequences of nutrient pollution are severe. The excessive growth of algae restricts sunlight and oxygen from reaching aquatic plants, leading to their decay and further depletion of oxygen levels. This creates "dead zones" in the ocean, making it uninhabitable for marine life. There are currently 415 dead zones around the world, with the largest one located in the Arabian Sea, covering an area of 165,000 square kilometers.
Climate change also plays a compounding role in the effects of nutrient pollution. It increases river runoff, providing more pathways for nutrients to enter the ocean. Additionally, overfishing removes algae-eating animals from the ecosystem, allowing algal blooms to grow larger. Ocean acidification, caused by the absorption of CO2 from combustion, further complicates the issue, impacting corals, shellfish, and plankton.
Addressing nutrient pollution requires a multifaceted approach. Implementing better monitoring systems and reducing nutrient inputs into coastal ecosystems are crucial steps. This includes restoring habitats such as mangroves and marshes, which can effectively remove nutrients from water before they reach the ocean. Additionally, promoting sustainable practices, such as planting vegetation along waterways and supporting wetland restoration, can help absorb excess nutrients and reduce runoff.
In summary, nutrient pollution is a severe form of ocean pollution with far-reaching consequences. It is fuelled by human activities and climate change, and it demands immediate attention and action from scientists, policymakers, and the public alike to protect and restore the delicate balance of marine ecosystems.
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Oil spills
The impact of oil spills on the environment can be both economically and ecologically costly. Oil spills can harm aquatic life by reducing the amount of sunlight penetrating the ocean surface and decreasing dissolved oxygen levels. This creates "dead zones" in the ocean, making it difficult for marine plants and animals to survive. Oil also damages the insulating and waterproofing properties of feathers and fur, causing birds and marine mammals to suffer from hypothermia. Ingesting oil can be toxic to animals, and the damage to their habitats can slow the long-term recovery of animal populations.
In addition to ecological consequences, oil spills can have significant economic repercussions. If beaches and populated shorelines are affected, tourism and commerce may be severely impacted. Power plants and other utilities that rely on or discharge into seawater may also experience disruptions. The cleanup and restoration costs of oil spills can be substantial, with responsible parties required to pay for these expenses under the Oil Pollution Act of 1990.
Overall, oil spills are a significant contributor to ocean pollution, with detrimental effects on marine life, ecosystems, and human economic activities. While regulations have reduced the frequency of large spills, the cumulative impact of numerous minor spills and chronic oil pollution continues to pose a significant environmental challenge.
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Carbon emissions
However, increasing greenhouse gas emissions have affected the ocean's ability to absorb carbon dioxide. Carbon emissions have led to ocean warming and acidification, which has negatively impacted marine life and reduced the ocean's capacity to act as a carbon sink. Ocean acidification is caused by the dissolution of carbon dioxide in seawater, resulting in a decrease in pH levels. This process has far-reaching consequences for marine organisms, particularly those with calcium carbonate shells or skeletons, such as oysters and other shellfish. The increasing acidity of seawater can dissolve their shells and impact their ability to grow and reproduce, threatening the shellfish industry and the livelihoods of those who depend on it.
Maritime shipping accounts for nearly 3% of global greenhouse gas emissions, contributing to the carbon pollution problem. To combat this, the transition to zero-emission energy sources, such as hydrogen, ammonia, methanol, or wind power, is crucial. The establishment of green shipping corridors, supporting zero-emissions technologies, is already underway in some regions.
Additionally, ocean warming threatens to melt hydrate caps that contain potent greenhouse gases, such as carbon dioxide and methane. If these caps melt, the carbon could be released into the ocean and the atmosphere, exacerbating the problem of carbon emissions and further contributing to ocean pollution.
While plastic pollution is often cited as the most visible and prevalent form of ocean pollution, carbon emissions from human activities have a more insidious and far-reaching impact on the health of our oceans and the planet as a whole.
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Frequently asked questions
Marine pollution, also called ocean pollution, is a mixture of both chemical contamination and trash. The majority of pollutants that enter the ocean originate from human activities on land. The worst type of ocean pollution is plastic pollution, with at least 14 million tons of plastic ending up in the ocean each year, making up 80% of all marine debris.
Plastic pollution has detrimental effects on marine wildlife. Plastic bags, for example, can be mistaken for food by marine animals, causing serious harm once ingested. Plastic debris can also release microplastics into the ocean, which are then consumed by marine animals.
Other types of ocean pollution include nutrient pollution, oil spills, noise pollution, and industrial pollution. Nutrient pollution occurs when excess nutrients such as nitrogen and phosphorus enter bodies of water, causing high levels of algae growth that restrict sunlight and oxygen, creating "dead zones" where marine life cannot survive. Noise pollution from ships and industrial activities can cause cellular damage to invertebrates and disrupt communication for marine mammals. Industrial pollution includes chemical contamination and waste such as acids, scrap metals, and coal ash.
