Bronte Wells
Ocean pollution has been increasing at alarming rates, with plastic pollution reaching unprecedented levels. It is estimated that there are 171 trillion plastic particles in the ocean, weighing around 2.3 million tons. This plastic pollution is a result of the rapid growth in global plastic production, with annual production increasing nearly 230-fold in the last 70 years. The majority of plastic pollution comes from land, ending up in oceans through rivers and other waterways. In addition to plastic pollution, ocean pollution also includes noise pollution, fossil fuels, and carbon emissions, all of which have detrimental effects on marine life and ecosystems.
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What You'll Learn
Plastic pollution in oceans is doubling every 6 years
Plastic pollution in the oceans is a critical issue that is witnessing an alarming increase, doubling every six years. This trend signifies a significant threat to marine life, ecosystems, and human health worldwide. The accumulation of plastic waste in the oceans has severe consequences, and the situation demands immediate attention and action.
The presence of plastic in the oceans has been a growing concern for several years, but recent studies have revealed a more dire situation than previously understood. Research conducted by Eriksen and their team, published in the Washington Post in 2023, found that plastic pollution in the oceans is doubling every six years. This study utilized new models and a comprehensive approach to data collection, including global ocean sampling, unpublished data from previous researchers, and peer-reviewed studies. The findings underscore the urgency of addressing plastic pollution.
Plastic pollution in the oceans has severe implications for marine life and ecosystems. As plastic breaks down into microplastics—particles smaller than 5 millimeters—they can be ingested by marine animals, leading to health issues and even extinction. Microplastics have been found in the tissues of marine organisms, demonstrating their integration into the food chain. This poses risks not only to marine life but also to human health, as these particles can accumulate toxins that are transferred to humans through seafood consumption.
The sources of ocean plastic pollution are diverse, with plastic waste originating from various countries and rivers. Studies have indicated that Asian countries, particularly middle-income nations, contribute significantly to plastic emissions in the ocean. This is attributed to factors such as waste management practices and the export of plastic waste from richer countries. Additionally, the production and consumption patterns of plastic play a crucial role. The exponential growth in plastic production since its inception has resulted in a substantial amount of waste, with a significant portion ending up in the oceans.
Addressing ocean plastic pollution requires a multifaceted approach. While individual behavioural changes are essential, they are not sufficient on their own. Supporting legislation that reduces plastic use and production, improving recycling infrastructure, and enhancing waste management practices are all necessary components of a comprehensive solution. Initiatives such as grassroots beach clean-ups and international agreements also contribute to mitigating this global issue.
In conclusion, the fact that plastic pollution in oceans is doubling every six years underscores the urgency of tackling this problem. The far-reaching consequences for marine life, ecosystems, and human health demand immediate action. By addressing the sources of plastic pollution, improving waste management, and advocating for legislative changes, we can collectively work towards reducing the impact of plastic pollution on our oceans and the planet.
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Plastic waste from rich countries is exported to poorer countries
Ocean pollution has reached unprecedented levels, with a recent study finding far more plastic in global oceans than previously believed. The amount of plastic pollution in the oceans is doubling every six years, with an estimated 1 to 2 million tonnes of plastic entering the oceans annually. The primary sources of this plastic pollution are middle-income countries, particularly in Asia, which contribute 86% of plastic emissions to the ocean.
Rich countries, such as the United States, Canada, and those in the European Union, are major contributors to ocean plastic pollution, not only through their own plastic consumption and waste management practices but also through the export of plastic waste to poorer countries. Despite being signatories to the Basel Convention, an international agreement regulating the trade of hazardous waste, these countries continue to offload hundreds of millions of tons of plastic on nations with weaker waste management systems, where it ends up in rivers and the ocean.
The United States, which has not ratified the Basel Convention, sent over 800 million pounds of plastic waste to Mexico, Malaysia, India, Vietnam, and other countries last year. This activity likely violates the convention's plastic amendments, which stipulate that regulated plastics cannot be traded with non-party countries. Europe is also suspected of non-compliance, with the Netherlands dramatically increasing its plastic exports to developing countries like Indonesia, Vietnam, and Malaysia in 2021.
The export of plastic waste from rich to poor countries is part of a larger pattern of waste colonialism, where industrialized nations outsource their environmentally hazardous waste disposal to regions with lower waste-disposal standards and less developed infrastructure. This practice has disastrous consequences for the affected communities and the environment. For example, the Agbogbloshie landfill in Ghana, known as "Toxic City," receives a significant amount of electronic waste from Europe, leading to toxic fumes and soil and water contamination.
The international plastic waste trade is not limited to commercial plastic waste but also includes hidden plastics in textiles, contaminated paper bales, and other categories. This has led to an underestimate of the true scale of plastic exports from high-income countries like the European Union, Japan, the United Kingdom, and the United States to poorer nations. The public health and environmental risks posed by these plastic exports are significant, as importers often dump or incinerate the waste, releasing toxic chemicals into the air, soil, and water.
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Ocean acidification is worsening due to carbon emissions
Ocean pollution has increased significantly over the years, with plastic waste being a major contributor. Studies have found that around 1 million tonnes of plastic end up in the oceans annually, with recent estimates suggesting that between 1 and 2 million tonnes of plastic enter the oceans each year. This plastic pollution has severe consequences for marine life and the environment.
One of the most pressing issues related to ocean pollution is ocean acidification, which is primarily caused by increasing carbon dioxide (CO2) emissions from human activities. The ocean absorbs about one-third of all human-induced CO2, which leads to a change in seawater chemistry known as ocean acidification. This process poses a severe threat to marine life, ecosystem health, and industries such as oyster farms and shellfish industries.
When CO2 dissolves in seawater, it forms carbonic acid (H2CO3), releasing hydrogen ions (H+) and increasing ocean acidity. This increase in acidity has far-reaching implications, especially for organisms that rely on calcium to develop and maintain their shells and skeletons. For example, certain types of plankton, oysters, crabs, sea urchins, shrimps, and lobsters depend on calcium carbonate (CaCO3) to build their shells and skeletons. As ocean acidification progresses, it becomes increasingly difficult for these organisms to maintain their calcified structures.
The problem of ocean acidification is not limited to the ocean itself but also extends to coastal estuaries and waterways. With the concentration of CO2 in the atmosphere continuing to rise due to the burning of fossil fuels and other human activities, the amount of CO2 absorbed by the ocean also increases. This, in turn, leads to a further increase in ocean acidity. While there may be potential technological solutions, such as geoengineering, the most effective way to address ocean acidification is to reduce carbon emissions and find more carbon sinks, such as regrowing mangroves, seagrass beds, and marshes.
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Marine life is harmed by human-generated ocean noise
Marine life is severely impacted by human-generated ocean noise, also known as anthropogenic noise. This type of noise pollution has increased dramatically in recent decades due to the growing utilization and exploration of the ocean by humans. The major sources of this noise include cargo vessels, naval sonar devices, seismic testing, drilling, and recreational boats.
The impact of this noise pollution on marine life is profound and far-reaching. Firstly, it interferes with the key life functions of marine mammals, such as communication, locating mates and prey, navigating, and avoiding predators. For example, whales and dolphins rely on clicks, whistles, and echolocation for long-distance communication, and increased ambient noise from human activities masks these signals, making it harder for them to survive and reproduce.
Secondly, loud noises can cause immediate and long-term damage to marine life, including hearing loss, behavioural and physiological changes, and even death. When exposed to loud noises, marine animals may panic and ascend too quickly, leading to decompression sickness and tissue damage. This was evident in the case of beaked whales, which are highly sensitive to sound and have experienced mass strandings due to military sonar operations.
Additionally, noise pollution can cause stress in marine mammals, similar to the effects of stress on humans, impacting their health, behaviour, and reproduction. Studies have shown that whales in busy shipping lanes exhibit elevated cortisol levels, indicating increased stress. Furthermore, noise pollution can lead to disorientation in marine animals, disrupting their ability to navigate, forage, and detect predators.
To mitigate the harmful effects of human-generated ocean noise, policies and guidelines must be implemented to reduce propeller noise from ships and mitigate the sounds of sonar equipment, seismic air guns, and construction. Quieter technologies and ship designs are also necessary to minimize underwater noise pollution and enable the recovery of marine life.
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Global plastic production has increased nearly 230-fold since the 1950s
Plastic waste makes up 80% of all marine pollution, with an estimated 75 to 199 million tons of plastic waste currently in our oceans. The production and use of plastic are still at their highest, and the data on recycling is not promising: only about 10% of the plastic we produce is currently being recycled. The rest is either incinerated, causing air pollution, or ends up in our oceans and the environment.
The impact of plastic pollution on marine life and ecosystems is devastating. Plastic items cause damage to animals through entanglement, ingestion, suffocation, laceration, infections, and internal injuries. Microplastics, which are tiny particles of plastic that do not fully degrade, are particularly harmful as they can be ingested by marine animals, entering the food chain and leading to disastrous consequences for the health of the planet and all its inhabitants. Research indicates that half of the sea turtles worldwide have ingested plastic, and hundreds of thousands of seabirds ingest plastic every year.
The presence of plastic in our oceans is a growing concern, with plastic pollution being one of the main causes of marine species extinction, health problems for humans and animals, and the destruction of ecosystems. It is clear that plastic pollution is a serious problem, and addressing it requires collective action on a global scale. Initiatives to curb ocean plastic pollution range from grassroots beach clean-ups to international agreements, such as the United Nations Environment Assembly's agreement to develop a legally binding treaty to end plastic pollution.
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Frequently asked questions
It is difficult to accurately quantify the total amount of plastic and other pollutants in the ocean. However, it is estimated that there are currently 15 to 75 trillion pieces of plastic and microplastics in the ocean, with 8 to 12 million metric tons of plastic being dumped into the ocean each year.
The amount of ocean pollution has increased significantly in recent decades. In the last ten years, we have produced more plastic products than in the previous century. The use of single-use plastics, poor recycling practices, and waste management issues have contributed to the growing problem of ocean pollution. It is predicted that by 2050, plastic will outweigh all fish in the sea.
The biggest source of ocean pollution is non-point sourcing, where rainfall or snowmelt picks up pollutants such as oil, grease, toxic chemicals, fertilisers, and agricultural runoff, and carries them into rivers, lakes, and coastal waters. Other sources include offshore drilling, noise pollution, and the burning of fossil fuels, which contribute to ocean acidification.
