Helena Joyce
The ocean is facing three major threats: overfishing, pollution, and climate change. Plastic waste, which makes up 80% of all marine pollution, is a significant contributor to this crisis. With billions of pounds of plastic entering the ocean each year, plastic pollution is expected to outweigh fish by 2050. The durability of plastic, which can take hundreds or even thousands of years to degrade, means that plastic pollution will continue to impact marine ecosystems for centuries to come. Other forms of ocean pollution include oil spills, chemical dispersants, carbon emissions, and noise pollution. The effects of these pollutants are wide-ranging, from disrupting the communication of whale species to reducing oxygen levels and creating dead zones in the ocean. To address ocean pollution, individuals can reduce plastic consumption, advocate for climate policies, and support initiatives to protect marine ecosystems.
| Characteristics | Values |
|---|---|
| Time taken for plastic to degrade | Hundreds of years |
| Plastic turning into microplastics | Plastic does not fully degrade but turns into microplastics |
| Plastic in oceans | 15-51 trillion pieces of plastic |
| Plastic as a percentage of marine pollution | 80% |
| Plastic in the ocean by 2050 | Plastic is expected to outweigh fish |
| Plastic production in the next decade | Increase by 40% |
| Plastic in the ocean from | Land, rivers, coastlines, and inland |
| Marine life affected by plastic | Seabirds, sea turtles, seals, marine mammals, Hawaiian monk seals, Pacific loggerhead sea turtles, and nearly 700 other species |
| Marine life affected by noise pollution | Large whale species like blue whales and killer whales |
| Impact of oil spills | Oil can linger for decades and cause irreversible damage to marine ecosystems |
| Impact of carbon emissions | Oceans absorb about 25% of man-made carbon emissions, leading to acidification |
| Impact of climate change | Dead zones in the ocean will expand, threatening marine life |
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What You'll Learn
Plastic pollution and the role of individuals
Plastic pollution is a pressing environmental issue that poses a threat to the marine environment and human health. It is estimated that there are currently 15-51 trillion pieces of plastic in the world's oceans, with plastic waste accounting for 80% of all marine pollution. The majority of plastic pollution in the oceans is caused by littering and the improper disposal of disposable plastic items such as food wrappings, plastic bags, razors, and bottles. As a result, marine species are at risk of ingesting plastic, suffocating, or becoming entangled, leading to the extinction of endangered wildlife.
The durability of plastic contributes to the persistence of this issue. Plastic can take hundreds to thousands of years to degrade, and even then, it may only break down into microplastics without fully disappearing. These microplastics, with sizes ranging from five millimeters to one nanometer, infiltrate every ecosystem on the planet, from the Antarctic tundra to tropical coral reefs. They are ingested by marine animals, entering the food chain and leading to detrimental consequences for the health of our planet and its inhabitants.
The presence of microplastics extends beyond marine life, as they have been detected in human livers, kidneys, and placentas. Carcinogenic chemicals in plastic products can contaminate tap water, potentially causing developmental, reproductive, neurological, and immune disorders. The average person may be ingesting approximately 5 grams of plastic weekly, leading to diseases, disabilities, and premature death.
To address plastic pollution, individuals can play a crucial role by reducing their plastic consumption and disposing of plastic waste responsibly. Being mindful of single-use plastics and opting for reusable alternatives, such as cloth bags and reusable bottles, can significantly contribute to decreasing plastic waste. Grassroots resistance and petitions to regulate plastics as a hazardous pollutant are also underway, aiming to address the issue at its source.
While individual efforts are essential, tackling plastic pollution requires a united international front. The UNEP chief has called for global cooperation to combat this crisis, recognizing that plastic pollution impacts nature, business, and human health. International organizations, governments, civil society, academic institutions, and the private sector must collaborate to address this pressing issue and protect our oceans and the planet for future generations.
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Plastic pollution and the role of governments
Plastic pollution is a pressing global issue that requires concerted action from governments and societies alike. It is estimated that 8 to 11 million metric tons of plastic enter the ocean each year, with plastic waste constituting about 80% of all marine pollution. The impact of this pollution is deadly for marine life and has severe consequences for the health of our planet and its inhabitants.
Governments have a crucial role to play in tackling plastic pollution and its root causes. At the international level, governments are working together to address this crisis. For instance, the United States has been actively involved in the United Nations Environmental Assembly (UNEA) and is spearheading the End Plastic Pollution International Collaborative (EPPIC). EPPIC is a public-private partnership that leverages scientific research and stakeholder engagement to drive collective action and promote global collaboration. The goal is to reduce plastic pollution and advance circular solutions through commitments from various sectors.
Additionally, the Intergovernmental Negotiating Committee (INC), established under a UNEA resolution, has been conducting negotiations to develop a new international agreement on plastic pollution, with the aim of concluding by the end of 2024. This resolution recognises plastic pollution as a global problem and seeks to address it through international cooperation.
At the domestic level, governments can implement policies and regulations to mitigate plastic pollution. This includes advocating for the reduction of plastic use, promoting reusable and recyclable products, and supporting initiatives that aim to reduce marine debris. For example, the Center for Biological Diversity has petitioned the U.S. Environmental Protection Agency to regulate plastics as a pollutant under the Clean Water Act, pushing for plastic pollution to be treated as hazardous waste.
Furthermore, governments can play a pivotal role in raising awareness, educating citizens about the environmental impact of plastic pollution, and encouraging individual commitments to reduce, reuse, and recycle plastic products. They can also provide incentives for industries to develop and adopt sustainable practices, invest in research and development for eco-friendly alternatives, and enforce strict regulations on plastic production, waste management, and disposal.
The fight against plastic pollution demands a multi-faceted approach, with governments taking the lead in implementing long-term solutions and fostering global collaboration to protect our oceans and the planet as a whole.
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Oil spills and irreversible damage
Oil spills are more common than one might expect, with thousands of spills occurring in US waters each year. While most of these are small, they can still cause damage, particularly in ecologically sensitive areas such as beaches, mangroves, and wetlands. Large oil spills are major disasters that can occur when pipelines break, oil tanker ships sink, or drilling operations go awry. The consequences of these large spills can be felt for decades, impacting ecosystems and economies alike.
Oil spills harm ocean life in two primary ways: fouling or oiling, and oil toxicity. Fouling or oiling occurs when oil physically impairs a plant or animal. For example, oil can render a bird unable to fly if its wings are coated, or it can remove the insulating properties of a sea otter's fur, making the animal susceptible to hypothermia. The extent of oiling often influences the affected organism's likelihood of survival. Oil is composed of numerous toxic compounds, which can induce severe health issues such as heart damage, stunted growth, immune system dysfunction, and even death.
Cleanup efforts can never entirely remove all spilled oil, and scientists must take care to avoid causing further harm with their interventions. Following the Exxon Valdez oil spill in 1989, it was discovered that high-pressure, hot-water hoses utilized in the cleanup process inflicted more damage than the oil alone. The Oil Pollution Act of 1990 established that those responsible for oil spills can be held accountable for covering the costs of cleanup and restoration. This evaluation and funding process is known as the Natural Resource Damage Assessment (NRDA).
In addition to the immediate ecological and economic repercussions, oil spills can also have long-term effects on the environment. Oil is a fossil fuel that contains toxic compounds, and when it is released into the ocean, it can have devastating consequences. While there is limited information on the long-term impacts of oil spills, it is clear that they can cause irreversible damage to marine ecosystems. Oil spills can contaminate water bodies, kill marine life, and destroy habitats, leading to a loss of biodiversity and ecological imbalance. The toxic compounds in oil can also have long-lasting effects on the health of marine organisms, including fish, birds, and mammals.
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Carbon emissions and ocean acidification
Carbon dioxide (CO2) emissions from human activities, such as burning fossil fuels and deforestation, have led to increased atmospheric CO2 concentrations, resulting in climate change and ocean acidification. The ocean absorbs a significant portion of this CO2, currently estimated at around 30%, reducing the rate of atmospheric warming. However, this absorption has a detrimental chemical effect on seawater, known as ocean acidification.
When carbon dioxide dissolves in seawater, it forms carbonic acid, increasing the concentration of hydrogen ions and reducing carbonate ions. This process decreases the ocean's pH, making the water more acidic. The degree of future ocean acidification is closely linked to the increase in atmospheric CO2. If emissions continue at the current rate, projections indicate that by the end of this century, ocean surface waters could have a pH of around 7.7-7.8, a level not seen in 14-17 million years.
Ocean acidification has significant ecological and economic impacts. It affects marine organisms that rely on calcium carbonate to build and maintain shells and skeletons, including plankton, oysters, crabs, corals, and some molluscs. The increased acidity weakens their shells, making them more vulnerable to damage and hindering their ability to recover from other stressors like coral bleaching. This disruption can have cascading effects throughout the marine food chain, impacting fisheries and aquaculture industries, as well as tourism and communities that depend on the ocean for their livelihoods and cultural identity.
To address ocean acidification, reducing global carbon dioxide emissions is crucial. This can be achieved by transitioning from fossil fuels to clean energy sources, improving energy efficiency, and exploring carbon sink solutions such as regrowing mangroves and seagrass beds. Additionally, local actions such as improving water quality, implementing sustainable fisheries practices, and utilising new technologies can help marine ecosystems adapt to the changing conditions. While it will take time for the oceans to recover from the effects of carbon emissions and acidification, immediate and sustained efforts to reduce emissions and mitigate impacts are essential to support the long-term health and resilience of marine environments.
While it is challenging to provide a precise timeframe for the ocean's recovery from carbon emissions and acidification, it is clear that the extent and duration of the recovery process depend on our collective ability to reduce carbon emissions and address the root causes of ocean acidification.
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Ocean noise pollution and marine ecosystems
Ocean noise pollution has increased dramatically over the past few decades, threatening the natural soundscape of the marine environment. This type of pollution is often overlooked, but it is extremely damaging to marine wildlife as most marine species are highly dependent on sound for their survival. Sound is a highly efficient means of communication underwater and is the primary way that many marine species gather and understand information about their environment. Marine mammals such as whales, dolphins, and porpoises rely on sound to communicate, locate mates and prey, avoid predators, navigate, and defend their territories.
Noise from human activities such as shipping, seismic surveys, explosions, construction, sonar devices, recreational boating, and energy exploration can travel long distances underwater, leading to increases and changes in ocean noise levels in many coastal and offshore habitats. These rising noise levels can negatively impact ocean animals and ecosystems by interfering with their key life functions. For example, increased ship noise has caused bottlenose dolphins to simplify their vocal calls, which may reduce the information content of their calls and decrease effective communication.
Noise pollution can also cause temporary or permanent hearing loss, behavioural and physiological changes, masking (where the ability to detect sound is overlapped or covered by another sound), injury, and even death. Very loud sounds can be particularly harmful to marine mammals. The constant drone of cargo vessels, for instance, masks the natural soundtrack of the sea and interferes with important biological or ecological processes over vast distances.
To address ocean noise pollution, advocacy efforts can push for stricter noise regulations in shipping lanes and offshore drilling sites, as well as incentives for quieter technologies and noise-reducing technologies. Scientific research and education are crucial in protecting marine ecosystems from this threat, and students can play a role by studying the effects of sound pollution and working towards conservation measures. By raising awareness and promoting industry-wide change, we can help mitigate the effects of ocean noise pollution and enable the recovery of marine life.
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Frequently asked questions
There is currently no definite answer to this question. However, it is clear that the oceans are facing three huge threats: overfishing, pollution, and climate change. If we do not address these issues, the oceans could be drastically changed within our lifetimes.
The majority of pollutants that enter the ocean come from human activities, including nonpoint source pollution from runoff, septic tanks, vehicles, farms, and livestock ranches, as well as point source pollution from oil spills and chemical spills. Plastic pollution is a significant contributor, with an estimated 8 to 10 million metric tons of plastic ending up in the ocean each year.
Individuals can play a crucial role in reducing ocean pollution by adopting more sustainable habits. This includes reducing plastic consumption, disposing of plastic waste properly, and supporting initiatives to protect and conserve marine ecosystems. On a larger scale, advocating for climate policies and regulations that address plastic pollution and offshore drilling can help mitigate the impact on ocean health.
