Helena Joyce
Ocean pollution is a pressing global issue that poses significant threats to marine ecosystems, human health, and economic activities. The world's oceans are inundated with billions of pounds of plastic, which accounts for the majority of marine debris. This plastic pollution comes from a range of sources, including runoff from land, improper waste management, and littering, with over 80% arising from land-based sources. It endangers marine life, such as sea turtles, seabirds, and fish, through ingestion and entanglement, and it also enters the human food chain. Other forms of ocean pollution include chemical contaminants, toxic metals, agricultural runoff, and oil spills, which further compound the issue. Addressing ocean pollution requires a combination of prevention, cleanup, and data-driven strategies, with many countries taking steps to regulate and reduce plastic pollution.
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What You'll Learn
Plastic pollution
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. Sea turtles, for instance, can mistake plastic for food, leading to choking, internal injuries, or starvation. Similarly, seabirds that feed on the ocean surface are prone to ingesting plastic debris, which can hinder chick growth and survival. In addition, "ghost nets," or discarded fishing nets, entangle various marine creatures, causing injury, starvation, and even suffocation.
The plastic waste in the oceans also accumulates pollutants and transports them through ocean currents. Research shows that marine life ingesting plastics coated with pollutants can absorb these toxins into their bodies. This contamination has been observed in fish and is now a part of the human food chain.
The primary sources of marine plastic pollution are human activities, with 98% originating from land-based activities and the remaining 2% from sea-based activities. Land-based sources include urban runoff, construction litter, trash from ports and marinas, and debris blown out of garbage containers. Sea-based sources include overboard discharges from ships and discarded fishing gear.
Addressing plastic pollution is an urgent global imperative, requiring collective efforts from individuals, communities, and governments. Prevention is key, and reducing the generation of disposable products is cost-effective and environmentally beneficial. Additionally, changes in manufacturing and packaging practices, as well as a reduction in single-use plastic products, are crucial steps towards tackling this crisis.
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Oil spills
When oil is spilled into the ocean, it forms a slick on the surface that can spread over a wide area. Marine animals that come into contact with this oil can suffer severe consequences. Oil can coat the feathers of birds and the fur of mammals, destroying their insulating abilities and leaving them vulnerable to hypothermia. It can also cause skin irritation, alter immune systems, and lead to reproductive and developmental damage in various species.
Fish, shellfish, and corals may not be immediately exposed to oil, but if it is mixed into the water column, they can be affected. Oil can impair the growth and reproduction of adult fish, and their eggs and larvae are particularly sensitive to lethal and sub-lethal impacts. Shellfish exposed to oil can become unsafe for human consumption.
The impact of oil spills can vary depending on the species and the life stage of the affected organisms. Juvenile animals and those in early life stages are often more susceptible to the toxic effects of oil and chemical dispersants used in cleanup efforts. The age and overall health of an animal can also influence the degree of harm caused by exposure to oil spills.
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Carbon emissions
Oceans are crucial in the fight against climate change, absorbing 30% of all carbon dioxide emissions and 90% of the excess heat generated by these emissions. They are the world's greatest carbon sink, a vital buffer against the impacts of climate change.
However, the increasing levels of greenhouse gas emissions have negatively affected the ocean's health. The ocean's absorption of carbon dioxide from the atmosphere is changing the pH of the ocean, making seawater more acidic. This process, known as acidification, impacts marine life, as many animals rely on specific pH levels to make shells and skeletons. Warmer water temperatures also reduce oxygen levels, which can lead to hypoxia or dead zones.
Maritime shipping, which accounts for nearly 3% of global greenhouse gas emissions, is a significant contributor to carbon emissions. The shipping sector must transition from traditional fossil fuels to zero-emission energy sources such as hydrogen, ammonia, methanol, or wind power. Green shipping corridors, already established across the Pacific and Atlantic oceans, support ships utilizing zero-emissions technologies.
Additionally, plastic production, which is expected to triple by 2050, will account for a significant portion of global carbon emissions. Plastic pollution in the ocean has devastating effects on marine wildlife, with ingestion of plastic leading to suffocation and starvation.
To address these issues, individuals can take steps to reduce their carbon footprint, such as shopping sustainably, reducing energy consumption, and transitioning to a circular economy that minimizes the use of single-use plastics.
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Pharmaceutical waste
Ocean pollution is a global issue, with billions of pounds of trash and pollutants entering the ocean each year. Marine debris, such as plastic, is a significant contributor to ocean pollution, with plastic pollution in particular having become a global crisis. Plastic accounts for around 40% of the world's ocean surfaces, and at current rates, it is expected to outweigh all the fish in the sea by 2050.
The effects of pharmaceutical waste on the ocean and marine life are not yet fully understood, but it is a growing concern. There is limited data on pharmaceutical concentrations in marine organisms, but antibiotics used in aquaculture are the most commonly reported. Other pharmaceuticals, such as painkillers, chemotherapy drugs, antibiotics, anti-convulsants, mood stabilizers, and sex hormones, have been found in drinking water supplies, indicating their presence in the water systems.
The problem of pharmaceutical waste in the ocean is not limited to human pharmaceuticals. Veterinary pharmaceuticals and pharmaceuticals added to animal feeding operations also contribute to ocean pollution. Up to 75% of the administered dietary dose of a veterinary medicine can be lost to the environment through various mechanisms, including dispersal of non-ingested pellets and excretion of drug metabolites.
The increasing human population along coastlines further exacerbates the issue of pharmaceutical waste in the ocean. Large centres of human population are often found in coastal areas, and pharmaceutical releases via municipal effluent discharges are probable. Global demographic trends towards coastal conurbations suggest that waste management from coastal megacities will become an even greater challenge in the future.
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Chemical contamination
Marine pollution is a pressing issue, encompassing various forms of contamination, including chemical pollution. Chemical contamination, also known as nutrient pollution, arises from human activities, particularly the use of fertilisers in agriculture. This leads to the runoff of chemicals, such as nitrogen and phosphorus, into waterways that eventually flow into the ocean.
The increased presence of these chemicals in coastal areas promotes the growth of algal blooms, which can be detrimental to both wildlife and humans. Algal blooms can harm local fishing and tourism industries, impacting the economy. Additionally, the chemicals can accumulate in the food chain, affecting marine life and potentially reaching humans through the consumption of contaminated seafood.
One of the significant concerns regarding chemical contamination is the presence of toxic chemicals in the ocean. These chemicals, including pesticides, pharmaceuticals, and heavy metals, can originate from various sources such as industrial discharges, sewage, and agricultural practices. For instance, the use of fertilisers on farms can result in chemical runoff, contributing to nutrient pollution in the ocean.
Another issue is the contamination of surface waters and groundwater by perfluoroalkyl substances (PFAS). PFAS are used in manufacturing a wide range of products, including non-stick cookware and water-repellent clothing. These chemicals are highly persistent in the environment and have been detected in substantial quantities in the oceans, becoming incorporated into the marine food chain. Organophosphorus flame retardants (OPFRs) are another type of chemical contaminant that has been introduced into marine ecosystems.
Furthermore, plastic pollution in the ocean also contributes to chemical contamination. Plastics can break down into microplastics, which are then ingested by marine organisms, allowing the chemicals from the plastic to enter their tissues. These toxic chemicals can accumulate in larger animals through the food chain and eventually reach humans, posing potential health risks.
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Frequently asked questions
Yes, ocean pollution is a global issue. It arises from multiple sources and crosses national boundaries. It is the consequence of reckless, shortsighted, and unsustainable human activities.
Ocean pollution is a combination of chemicals and trash. Most of the trash is plastic. The majority of pollutants come from human activities along coastlines and far inland. One of the biggest sources of pollution is nonpoint source pollution, which occurs as a result of runoff from septic tanks, vehicles, farms, livestock ranches, and timber harvest areas.
Marine debris injures and kills fish, seabirds, and marine mammals. Research indicates that half of the sea turtles worldwide have ingested plastic, choking, sustaining internal injuries, or starving after eating it. Marine plastic pollution has impacted at least 267 species worldwide, including 86% of all sea turtle species, 44% of all seabird species, and 43% of all marine mammal species.
