Kiera Jefferson
The Baltic Sea is often referred to as the most polluted sea in the world. However, it is difficult to confirm this with certainty. The Baltic Sea is an inland sea with limited water exchange, which means that toxins and other pollutants remain in the water for a long time. Eutrophication, driven by excess nutrient loads, is the most critical environmental challenge facing the Baltic Sea. This leads to severe ecological imbalances, harming marine life and human activities. The sources of marine pollution are municipal and industrial waste inputs directly into the sea or via rivers, and atmospheric inputs mainly from traffic and agriculture. Hazardous substances such as heavy metals, pharmaceuticals, microplastics, nanoparticles, and larger litter in all forms pose serious risks to the Baltic Sea's ecosystem and human health.
| Characteristics | Values |
|---|---|
| Eutrophication | Driven by excess nutrient loads, eutrophication leads to severe ecological imbalances, harming marine life and human activities. |
| Sources of Pollution | Municipal and industrial waste, atmospheric inputs from traffic and agriculture, urban runoff, natural background sources, marine litter, chemical contaminants, microplastics, nanoparticles, and large litter. |
| Impact | Environmental, economic, and social crisis, including harm to marine ecosystems, human health, and regional economies. |
| Efforts to Address Pollution | Helsinki Convention, coordinated regional efforts like the HELCOM Baltic Sea Action Plan, improved wastewater treatment, stricter waste management, and public awareness. |
| Status | One of the most polluted seas in the world, with a slow water turnover that causes pollutants to remain in the water for extended periods. |
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What You'll Learn
Eutrophication and oxygen depletion
Eutrophication is the most critical environmental challenge facing the Baltic Sea. It occurs when there is an excessive amount of nutrients, such as nitrogen and phosphorus, in the water. These nutrients act as fertilisers, boosting the growth of algae and other aquatic plants. While nutrients are essential for life, an overabundance can lead to environmental imbalances.
In the Baltic Sea, eutrophication has been an ongoing issue for decades. The sea's limited water exchange means that pollutants remain in the water for long periods, accumulating over time. Most of the nutrient inputs come from human activities on land and at sea, including agriculture, which is the largest human-caused contributor, releasing significant nutrients into waterways through fertiliser and animal waste. Other sources include urban runoff, natural background sources such as soil erosion, and industrial and shipping activities.
Eutrophication has severe consequences for the Baltic Sea. One of the most visible effects is harmful algal blooms, particularly cyanobacteria or blue-green algae. These blooms can cover up to 200,000 km2 every summer, impacting the ecosystem, economy, and human well-being. They also contribute to eutrophication by adding nitrogen to the system, further stimulating oxygen demand and enhancing phosphorus release from sediments.
Oxygen depletion, or hypoxia, is a significant consequence of eutrophication in the Baltic Sea. Hypoxia is a natural phenomenon in some of the deepest basins of the sea, but it has increased in size and frequency due to eutrophication. The increase in nutrient inputs has shifted the balance between oxygen supply and consumption, leading to oxygen depletion in the coastal and open Baltic Sea. This has impacted nutrient biogeochemical cycles, with low oxygen concentrations altering the release of phosphorus and nitrogen in the water.
The lack of oxygen at the seabed caused by eutrophication has severe ecological impacts. Exposed areas lose their function as habitats, damaging the food web and threatening the biodiversity of the Baltic Sea. The expansion of hypoxia promotes the release of phosphorus from sediments, further stimulating the growth of nitrogen-fixing cyanobacteria. This creates a positive feedback loop, enhancing eutrophication and oxygen depletion.
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Hazardous substances
The slow water turnover in the Baltic Sea means that toxins and pollutants remain in the water for extended periods, allowing them to accumulate over time. This accumulation has severe ecological consequences, impacting marine life, human health, and regional economies.
The European Union Strategy for the Baltic Sea Region (EUSBSR) aims to address this issue through its Policy Area Hazards, which promotes macro-regional responses to global challenges related to chemicals management and sound chemical management. The Baltic Marine Environment Protection Commission, or HELCOM, is also actively working to protect the Baltic Sea from hazardous substances by developing measures and solutions.
The Baltic Sea Action Plan (BSAP), adopted by HELCOM in 2007 and updated in 2021, has led to significant environmental improvements, including a reduction in nutrient inputs to the sea and a decrease in maritime incidents and spills. However, there is still much work to be done to address the complex issue of hazardous substances in the Baltic Sea.
To effectively tackle this issue, a comprehensive approach is necessary, including stricter regulations, improved wastewater treatment, sustainable agricultural and industrial practices, and increased public awareness about the impacts of plastic pollution. By addressing these various sources of pollution and working collaboratively, it is hoped that the Baltic Sea can be restored to a healthier state for future generations.
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Marine litter
A 2020 study using the sand rake method found that artificial polymers were the predominant form of marine litter, constituting 52.7% of litter pieces. The most common types of litter were industrial pellets (19.8%), non-identifiable plastic pieces 2-25mm (17.3%), cigarette butts (15.3%), and paraffin (11.9%). These four categories accounted for approximately 64% of all findings.
The monitoring of sandy beaches is a common method to assess marine pollution, as beaches are considered a major sink for marine litter. The sand rake method, applied on a large scale in all bordering states of the Baltic Sea, provides a full spatial pollution pattern and can assess the effectiveness of marine litter mitigation measures.
Addressing marine litter in the Baltic Sea requires stricter waste management, improved regulations, and increased public awareness to reduce plastic pollution and protect the fragile ecosystem.
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Climate change and overfishing
The Baltic Sea is one of the most polluted seas in the world, with hazardous substances such as heavy metals, persistent organic pollutants (POPs), pharmaceuticals, microplastics, nanoparticles, and larger litter. The sea's limited water exchange causes pollutants to remain in the water and accumulate over time. Eutrophication, caused by excess nutrient loads, is another critical environmental challenge facing the Baltic Sea, leading to ecological imbalances and harming marine life. These nutrients, such as nitrogen and phosphorus, act as fertilizers, promoting excessive plant growth and disrupting the ecosystem.
Climate change is a significant factor contributing to the environmental deterioration of the Baltic Sea. The sea's unique characteristics, including a mixture of saline and freshwater and a shallow depth, make it particularly vulnerable to environmental changes. Climate change, coupled with other factors like excessive nutrient input, pollution, invasive species, and over-exploitation, have led to a dramatic decline in commercial fish stocks, threatening both the ecosystem and the fishing industry.
Overfishing has had a significant impact on the Baltic Sea, with commercial species such as cod and herring being particularly affected. In the western Baltic Sea, herring stocks have declined by over 80% since the early 1990s, and small-scale fishermen have struggled to catch enough to sustain their livelihoods. The 2013 reform of the EU Common Fisheries Policy aimed to address overfishing by introducing a ban on discards and emphasizing long-term multi-annual management plans for more stable and sustainable fishing practices. However, the target of rebuilding and maintaining fish stocks above levels capable of producing maximum sustainable yield by 2020 was not met.
The combination of climate change and overfishing has had a detrimental effect on the Baltic Sea ecosystem and the region's economy. The sea's vulnerability to environmental changes, coupled with the decline in fish stocks, has resulted in a loss of economic and cultural importance for fisheries. Additionally, the slow water exchange in the Baltic Sea means that toxins and pollutants persist for extended periods, further exacerbating the impact of climate change and overfishing on the fragile ecosystem.
Addressing the issues of climate change and overfishing in the Baltic Sea requires a comprehensive approach. Engaging local stakeholders in the 1,500 municipalities in the Baltic Sea watershed is crucial for restoring the marine ecosystem and protecting the well-being of the 9 million people living in the region. Additionally, sustainable agricultural practices, improved wastewater management, stricter waste management regulations, and reduced plastic pollution are essential steps toward mitigating the impact of climate change and overfishing on the Baltic Sea.
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Industrial waste
The Baltic Sea is considered one of the most polluted seas in the world. While it is difficult to confirm with absolute certainty, its limited water exchange means that pollutants remain in the water for extended periods, accumulating over time. This accumulation of harmful substances, including hazardous waste from industrial activities, poses a significant threat to the Baltic Sea's fragile marine ecosystem and human health.
Industrial activities contribute significantly to the pollution of the Baltic Sea. Hazardous substances and toxic chemicals released by industries into the water body include heavy metals, persistent organic pollutants (POPs), emerging contaminants like pharmaceuticals, and industrial waste. These pollutants have severe ecological and economic impacts and affect human well-being.
The release of industrial waste into the Baltic Sea has had detrimental effects on marine life and human activities. One of the most pressing issues is the collapse of fish stocks, caused by a combination of industrial waste, chemicals, fertilisers, and sewage. This has placed immense pressure on governments to address the problem and find solutions.
To combat the issue of industrial waste in the Baltic Sea, various initiatives have been undertaken. One such initiative is the Better Efficiency for Industrial Sewage Treatment (BEST) project, which aims to improve the treatment of industrial wastewaters and reduce the discharge of nutrients and hazardous substances into the sea. The project has involved interviewing experts from various countries, developing local cooperation models, and arranging planning meetings, joint learning sessions, and on-site visits to improve wastewater management practices.
In addition to the BEST project, other technologies have been piloted to reduce pollution from industrial wastewaters. For example, a phosphorus filtering system for nutrient recovery has been successfully tested in Doruchów, Poland, and a new balancing tank has been constructed for a dairy factory in Estonia to improve wastewater treatment. These initiatives provide a glimmer of hope in the collective effort to restore the Baltic Sea's ecological balance and protect its fragile ecosystem.
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Frequently asked questions
It is difficult to determine with certainty whether the Baltic Sea is the most polluted sea in the world. However, there is no doubt that it ranks high on the list.
The Baltic Sea is almost totally surrounded by land and therefore sources of marine pollution are located mainly on the land. More than 80% of marine pollution comes from land-based activities. The main sources of pollution include industrial, agricultural, and municipal waste inputs directly into the sea or via rivers.
The sources of marine pollution include municipal and industrial waste inputs directly into the sea or via rivers, and atmospheric inputs mainly from traffic and agriculture.
The effects of pollution on the Baltic Sea include eutrophication, oxygen depletion, harmful algal blooms, and the disruption of marine ecosystems.
To reduce pollution, the surrounding countries organized the Helsinki Convention, which came into force in 1980. The Helsinki Commission (HELCOM) acts as a coordinator and is responsible for the enforcement of the Baltic monitoring program and international research projects. Local stakeholders in the 1,500 municipalities in the Baltic Sea watershed are also crucial to restoring the Baltic Sea.
