Bronte Wells
Oceans account for 70% of the Earth's surface and play a crucial role in the health of our ecosystems, including land-dwelling animals and humans. However, with billions of pounds of trash and pollutants entering our oceans annually, marine ecosystems are being drowned in trash, noise, oil, and carbon emissions. This pollution primarily comes from human activities, with nonpoint source pollution from runoff being one of the biggest contributors. The consequences are dire, as marine life is harmed, habitats are damaged, and the health of humans and marine organisms is threatened. Furthermore, the increasing acidification of the oceans due to carbon emissions is causing significant changes to marine ecosystems and the economies that depend on them.
| Characteristics | Values |
|---|---|
| Types of pollution | Chemical, trash, fossil fuels, noise, oil, carbon emissions, plastic |
| Causes | Human activities, nonpoint source pollution, runoff, littering, poor waste management, storm water discharge, natural disasters, derelict fishing gear, crude oil spills, atmospheric pollution, deep-sea mining, discharges from marine shipping, offshore industrial operations, waste disposal at sea |
| Effects | Harm to marine life, human health, and economies, entanglement and ingestion of plastic by marine animals, algal blooms, ocean acidification, negative health outcomes, ecosystem disruption |
| Prevention and Solutions | Data-driven strategies based on law, policy, technology, and enforcement, regulations to limit or ban disposable plastic, prevention and cleanup, education and community action |
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What You'll Learn
Plastic pollution is harmful to marine life and human health
Plastic pollution is the most visible component of ocean pollution. It is growing rapidly, and it is only the obvious tip of a much larger problem. It threatens marine life and human health in a variety of ways.
Plastic pollution in the ocean comes primarily from land runoff, but also includes paint shed from shipping, discarded fishing gear, littering, poor waste management practices, stormwater discharge, and extreme natural events such as tsunamis and hurricanes. Marine debris, ranging from tiny microplastics to abandoned vessels, can harm or kill animals when ingested or when they become entangled. It can also damage sensitive habitats, interfere with navigation safety, and threaten human health.
Seabirds, for example, mistake small plastic fragments on the water's surface for food, leading to starvation or suffocation. Some seabirds are able to regurgitate plastic, but others, like petrels, find this difficult. Northern fulmars, for instance, ingest plastic pellets, and the species is now monitored as an indicator of pellet pollution levels in the North Sea. Many seabird species have also been found to feed plastic pieces to their young. Plastic debris is said to cause the deaths of more than a million seabirds each year.
Fish often mistake small plastic pieces for food as well. In a study summarising over 100 research papers on fish and plastic ingestion among 500 fish species, over two-thirds had consumed plastic. Molluscs such as mussels and oysters also take in microplastics when they filter seawater to feed. In a recent study of mussels sourced from UK waters, 100% of samples were found to contain microplastic pieces.
Plastics can adsorb up to one million times more toxic chemicals than the water around them, and these toxins can transfer to the fatty tissues of the organisms that ingest them. This includes humans, as microplastics have been found in human blood and placentas and in food and drinks, including tap water, beer, and salt. Several chemicals used in the production of plastic materials are known to be carcinogenic and can cause developmental, reproductive, neurological, and immune disorders.
To address plastic pollution, fewer plastic products need to be made, and the circularity of supply and value chains needs to be increased. Consumer behaviour must also change, and there must be public and private investment in infrastructure along the full lifecycle of plastics, including circular economy solutions like reuse and refill.
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Oil spills and ocean mining cause long-lasting damage
Oceans are a critical component of the global ecosystem, but they are increasingly threatened by human activities. One of the most significant threats is pollution, which takes many forms, including trash, noise, oil spills, and carbon emissions. Oil spills and ocean mining, in particular, can have long-lasting detrimental effects on marine ecosystems.
Oil spills are a major environmental disaster that can occur during the drilling, transportation, or use of oil. These spills can have devastating consequences for marine life and the ecosystems they inhabit. Oil spills coat plants and animals, impairing their movement and vital functions. For example, oil can render a bird unable to fly or strip a sea otter of its insulating fur, leaving it vulnerable to hypothermia. Additionally, oil contains toxic compounds that can cause heart damage, stunted growth, immune system defects, and even death in marine organisms. The Deepwater Horizon oil spill in 2010, which spread oil across 68,000 square miles of sea surface, resulted in the deaths of approximately 1 million seabirds, 5,000 marine mammals, and 1,000 sea turtles.
The impact of oil spills extends beyond the immediate harm to wildlife. They can also contaminate beaches, mangroves, and wetlands, ruining recreational activities and making seafood unsafe to eat. The economic consequences can be significant, affecting industries such as tourism and fisheries. Furthermore, the cleanup and restoration efforts required after an oil spill can be costly and time-consuming, with federal, state, and tribal agencies working together to fund and implement restoration projects.
Ocean mining, another human activity, poses additional risks to marine ecosystems. The construction of infrastructure for ocean mining can destroy large areas of pristine wilderness and habitats used by wildlife. The heavy equipment and drilling sites can leave irreversible damage, and even if mining companies abandon these sites, it can take centuries for the environment to recover fully. Moreover, ocean mining contributes to the pollution of the oceans through the discharge of waste and the use of hazardous chemicals. These activities further exacerbate the harm caused by oil spills and ongoing pollution from land-based sources, such as plastic pollution and agricultural runoff.
The consequences of oil spills and ocean mining are far-reaching and long-lasting. They disrupt the delicate balance of marine ecosystems, harm wildlife, and degrade habitats. Preventing and mitigating these impacts is crucial for the health and sustainability of our oceans. It requires a combination of improved technologies, stricter regulations, and a transition to renewable energy sources that prioritize the preservation of our marine environments.
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Carbon emissions lead to ocean acidification
Oceans absorb around a quarter of all carbon dioxide (CO2) emissions. The burning of fossil fuels and changing land use, such as deforestation, are human activities that have increased atmospheric CO2 levels. As a result, the amount of carbon dioxide absorbed by the ocean has also increased, causing ocean acidification.
When CO2 is absorbed by seawater, a series of chemical reactions occur, leading to an increased concentration of hydrogen ions. This process has far-reaching implications for the ocean and its inhabitants. Ocean acidification has already impacted the entire ocean, including coastal estuaries and waterways. The pH of the ocean surface has increased by an estimated 30% since the start of the industrial revolution 200 years ago, and the pH is projected to decline even further by the end of this century.
The increase in ocean acidity has significant effects on marine organisms and ecosystems. It reduces the availability of calcium carbonate, making it challenging for organisms like corals, molluscs, and some plankton to maintain their structural integrity. The shellfish industry, for example, is vulnerable to ocean acidification, with potential losses of over $400 million annually by 2100.
Billions of people worldwide rely on seafood as their primary source of protein. With ocean acidification threatening marine ecosystems and food sources, it is crucial to address the root cause: unabated CO2 emissions from the burning of fossil fuels. Substantial reductions in these emissions would allow the Earth's systems to recover from human-induced acidification and re-establish balanced ocean chemical conditions.
In addition to carbon emissions, pollution in the form of trash, oil, and noise is also harming marine life and ecosystems. Marine debris, including microplastics, derelict fishing gear, and abandoned vessels, can entangle and harm marine animals, damage habitats, and interfere with navigation safety. It is important to recognize the impact of human activities on ocean pollution and take preventive measures to protect the health and well-being of marine life and humans alike.
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Nonpoint source pollution is caused by runoff from land
Oceans are severely impacted by pollution, which comes from a variety of sources, including land-based runoff, fossil fuels, trash, offshore drilling, and noise. Marine debris, such as microplastics, derelict fishing gear, and abandoned vessels, poses a significant threat to marine life, navigation safety, and even human health. Land-based sources account for approximately 80% of ocean pollution, and nonpoint source pollution (NPS) is a major contributor.
The pollutants in NPS runoff can have harmful effects on ecosystems, economies, and human health. They can contaminate drinking water supplies, impact recreational activities, harm fisheries, and endanger wildlife. The concentration of pollutants from NPS sources may vary, but the total amount delivered from these sources can be significant due to their numerous origins. High population densities along coastal regions can further exacerbate the issue.
The impacts of NPS pollution on water quality and the environment are significant. It can lead to mass die-offs of fish, affect the aesthetics and health of coastal areas, and result in financial losses for industries such as recreational fishing and tourism. Additionally, NPS pollution can drive down property values and negatively impact the overall quality of life in coastal communities.
Addressing NPS pollution requires a multifaceted approach. Implementing best management practices in agriculture, such as reducing the use of pesticides and properly managing livestock operations, can help minimize NPS pollution. In urban areas, proper waste management, including keeping litter, pet wastes, and leaves out of storm drains, is crucial. Additionally, the public can play a role in controlling NPS pollution by following guidelines provided by organizations like the EPA, which offer suggestions for reducing runoff pollution and protecting water quality.
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Marine debris can damage habitats and harm wildlife
Marine debris is a critical threat to the health of the world's oceans, coastal areas, and waterways. It is a pressing issue on local, regional, national, and international levels. Marine debris can damage habitats and harm wildlife in several ways.
Firstly, it can physically injure or kill marine and coastal wildlife. Plastic ingestion leads to internal injury, intestinal blockage, starvation, and even death. Seabirds are particularly vulnerable, with plastic found in 90% of them. Other debris, such as packing bands and six-pack rings, can cause entanglement in various animal species, including seabirds, cetaceans, pinnipeds, invertebrates, and sea turtles. Marine debris also poses a threat to human health and safety. Sharp objects or those containing hazardous substances can injure people in the water or on beaches.
Secondly, marine debris can damage and degrade habitats. Large debris, such as derelict vessels and appliances, can crush and smother sensitive habitats like coral reefs. Additionally, iron debris from shipwrecks can cause an overgrowth of cyanobacteria, and abandoned fishing gear can continue to capture and kill wildlife while damaging active fishing operations.
Natural disasters can exacerbate the problem of marine debris. For example, Hurricane Irma in 2017 caused significant damage to the Florida Keys, leaving behind a substantial amount of marine debris. This included traps, ropes, and buoys that endangered sea turtles and other wildlife.
Marine debris is primarily a human-caused issue, with land-based sources accounting for about 80% of ocean pollution. This includes littering, poor waste management, stormwater discharge, and extreme natural events like hurricanes. Marine debris is a pressing concern that requires collaborative efforts to address its impact on wildlife and habitats.
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Frequently asked questions
Oceans account for 70% of the surface of planet Earth and play a pivotal role in the health of our ecosystem, including land-dwelling animals like us humans. When there is too much pollution in the oceans, it results in damage to the environment, the health of all organisms, and economic structures worldwide.
The sources of ocean pollution are both land-based and ocean-based. Land-based sources account for approximately 80% of ocean pollution, while discharges from marine shipping, offshore industrial operations, waste disposal at sea, and ocean-based sources like derelict fishing gear account for the remaining 20%.
Ocean pollution can be prevented. Many countries have used data-driven strategies based on law, policy, technology, and enforcement to control air and water pollution, and these strategies are now being applied to ocean pollution. Solutions for marine pollution include prevention and cleanup. Changing society's approach to plastic use will be a long and economically challenging process, but many countries are taking action. According to a 2018 report from the United Nations, more than sixty countries have enacted regulations to limit or ban the use of disposable plastic items.
