Kiera Jefferson
Plastic pollution is a pressing global issue. It is estimated that 11 million tonnes of plastic enter the ocean every year, with 9.5 million tonnes of this coming from land and 1.75 tonnes coming from the fishing and shipping industry. The plastic accumulates in huge subtropical oceanic areas called gyres, which are massive circular currents that trap the floating plastic for decades, if not centuries. This has led to the formation of the Great Pacific Garbage Patch, located in the North Pacific Ocean between Hawaii and California. The patch is estimated to be twice the size of Texas and contains around 100 million kilograms of plastic. The impact of plastic pollution on marine wildlife is devastating, with thousands of seabirds, sea turtles, seals, and other marine mammals killed each year due to ingestion or entanglement. It is clear that plastic plays a significant role in ocean pollution, and addressing this issue requires urgent global action.
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What You'll Learn
Plastic waste mismanagement
The impact of plastic waste mismanagement is evident in the increasing plastic pollution in our oceans. Annually, one to two million metric tons of plastic enter our oceans, with Asian countries contributing 86% of plastic emissions to the ocean. Plastic accumulates in subtropical oceanic areas called gyres, massive circular currents that trap plastic for extended periods. The most well-known gyre is the Great Pacific Garbage Patch, located between Hawaii and California. It is estimated to be twice the size of Texas and contains around 100 million kilograms of plastic, with pieces larger than 0.5 mm.
The sources of plastic waste mismanagement vary. In high-income countries, effective waste management systems keep plastic out of the natural environment, despite high plastic consumption. However, in low-to-middle-income countries, plastic waste mismanagement is more prevalent, with poorer waste handling, inconsistent recycling policies, and profit-driven business models contributing to the issue. Coastal cities in middle-income countries are hotspots for plastic emissions, as rivers carry plastic from land to sea.
To address plastic waste mismanagement, a combination of interventions is necessary. This includes improving waste collection, tackling illegal dumping, enhancing landfill management, and implementing preventive measures to reduce leakages. Policies to reduce plastic production, promote recycling, and invest in waste management infrastructure can also help reduce mismanagement. By combining these efforts, it is estimated that mismanaged plastic waste can be reduced by up to 91%.
The consequences of plastic waste mismanagement on marine life are severe. Marine wildlife, including fish, turtles, seals, crustaceans, and microorganisms, suffer direct and damaging effects from ingesting or becoming entangled in plastic. The durability of plastic means that once it enters the ocean, it persists for long periods, continuously impacting marine ecosystems.
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Plastic's durability in oceans
Plastic is one of the biggest factors contributing to ocean pollution. It is estimated that one to two million tons of plastic enter our oceans annually, with a further 400 million tons of plastic produced each year that could potentially end up in the ocean.
Plastic is a highly durable material, and this is one of its most valuable assets. However, this durability becomes a problem when plastic ends up in the ocean, as it will persist there for long periods. Plastic does not fully biodegrade in water, and unlike some other kinds of waste, it does not decompose. This means that plastic can remain in the ocean indefinitely, wreaking havoc on marine ecosystems. The oldest pieces of plastic found in clean-up operations date back to the 1960s, and marine life has been bearing the consequences for this entire period.
Plastic accumulates in huge subtropical oceanic areas called gyres, which are massive circular currents that trap floating plastic for decades, if not centuries. There are five gyres in the oceans, with the most polluted being the Great Pacific Garbage Patch, located in the North Pacific Ocean between Hawaii and California. This gyre is estimated to be twice the size of Texas and contains around 100 million kilograms of plastic, with pieces larger than 0.5mm.
Plastic enters the ocean through thousands of sources worldwide every day. Rivers are the primary carriers of plastic from land to sea, and coastal cities in middle-income countries are the world's plastic emissions hotspots. During storms and heavy rain, plastic emissions can increase tenfold as trash is washed into waterways. Once in the ocean, plastic can float or sink, with nearly half of it sinking due to its low buoyancy. Of the plastic that floats, 80% will beach on a coastline within a month, although some may be washed out to sea again.
The durability of plastic in the ocean has severe consequences for marine wildlife. Plastic ingestion reduces the storage volume of the stomach, causing starvation, and entanglement in plastic debris has led to injury and mortality in many species. It is estimated that 60% of all seabird species have eaten plastic, and this number is predicted to increase to 99% by 2050. Marine mammals such as whales, seals, and sea lions are also affected, with large amounts of plastic debris found in their habitats, including endangered breeding grounds.
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Plastic's impact on marine life
Plastic pollution in the ocean has a detrimental impact on marine life, affecting all land, freshwater, and marine ecosystems. It is a significant contributor to biodiversity loss, ecosystem degradation, and climate change. The impact of plastic pollution on marine life can be understood through the following key points:
Ingestion by Marine Life
Plastic debris in the ocean is often mistaken for food by marine animals, leading to ingestion. This is a significant issue for seabirds, sea turtles, seals, crustaceans, and various fish species. For example, sea turtles show a preference for clear, sheet plastic items like plastic bags and balloons, which they mistake for prey. Similarly, seabirds have been found with stomachs full of plastic, leading to a condition called "plasticosis," caused by internal injuries and scarring from ingesting rough-edged plastic pieces. It is estimated that over two-thirds of fish species have consumed plastic, with fish in the North Pacific ingesting 12,000 to 24,000 tons of plastic annually. This ingestion can lead to intestinal injuries and death, transferring plastic up the food chain to larger marine animals and eventually humans.
Entanglement and Trapping
Large pieces of plastic can entangle marine animals, leading to injury, loss of limbs, and even death. This is particularly common among endangered species such as the Hawaiian monk seal and the Steller sea lion. Entanglement can also make marine animals more vulnerable to predators by inhibiting their movement and escape abilities.
Microplastics and Toxin Adsorption
As plastic breaks down over time due to exposure to the elements, it forms microplastics (smaller than 5 mm) and nanoplastics (smaller than 100 nm). These tiny plastic particles are invisible to the naked eye and can be ingested by a wide range of marine organisms, from molluscs like mussels and oysters to apex predators like great white sharks and orcas. Microplastics have a high capacity for adsorbing toxins, which can then transfer to the fatty tissues of the organisms that consume them. The long-term impacts of microplastics on marine life are still being studied, but they pose a significant and growing threat to marine ecosystems.
Impact on Coastal Ecosystems
Plastic pollution not only affects open ocean areas but also accumulates in coastal ecosystems. It can become embedded in shorelines, delicate coastal habitats, and even uninhabited islands. Coastal cities in middle-income countries are hotspots for plastic emissions, as rivers carry plastic from land to the sea. This pollution can impact marine life in these areas, including unique ecosystems such as deep-sea cold-water corals and hydrothermal vent communities.
Global Extent and Persistence
Plastic pollution is a global issue, with all five of the Earth's major ocean gyres, particularly the Great Pacific Garbage Patch, inundated with plastic. Once plastic enters the ocean, it can persist for decades or centuries due to its durability. The oldest pieces of plastic found in clean-up efforts date back to the 1960s, demonstrating the long-term presence of plastic in marine environments.
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Plastic pollution sources
Plastic pollution is a pressing issue that affects all land, freshwater, and marine ecosystems. It is a significant contributor to biodiversity loss, ecosystem degradation, and climate change. While only a small proportion of plastic is improperly disposed of, even a small amount can have a significant impact on the environment.
Single-Use Plastics
Single-use plastics are a major contributor to plastic pollution. These include items such as bottles, caps, cigarettes, shopping bags, cups, straws, and stirrers. Straws, in particular, have been identified as one of the major contributors to plastic pollution, with initiatives like "No Straws Attached" encouraging hotels and food chains to adopt sustainable alternatives. Similarly, bottle caps are often mistaken for food by marine life, leading to poisoning and starvation. Plastic bags are another significant concern, as they can entangle birds, animals, and wildlife, causing fatal consequences.
Land-Based Sources
Most plastic pollution in the oceans originates from land-based sources. Urban and stormwater runoff, littering, industrial activities, tyre abrasion, construction, and agriculture are significant contributors. Rivers play a crucial role in transporting plastic from land to sea, with coastal cities in middle-income countries being identified as hotspots for plastic emissions. A 2021 study identified 1000 rivers worldwide that contribute to nearly 80% of ocean plastic emissions. The Pasig River in the Philippines alone accounts for 6.4% of global river plastics.
Marine Sources
Marine sources also contribute to plastic pollution in the oceans. Abandoned fishing gear, such as nets, lines, and ropes, make up a significant portion of plastic pollution in the oceans. Shipping activities, including paint shed from ships, also contribute to the problem.
Mismanaged Waste
Mismanaged waste is a critical factor in plastic pollution. When plastic waste is not recycled, incinerated, or properly disposed of in sealed landfills, it becomes vulnerable to entering the ocean. This is particularly prevalent in low-to-middle-income countries, where waste management systems may be less effective. It is estimated that only 9% of plastic waste is recycled globally, with half going straight to landfill and another fifth being mismanaged.
Consumer and Industrial Activities
Plastic is used in a wide range of consumer and industrial activities, including construction, vehicles, electronics, and agriculture. The production and consumption of plastic have increased rapidly, with annual production reaching 460 million metric tons in 2019. As plastic is durable and does not biodegrade, it persists in the environment for long periods, causing severe degradation to ecosystems and harming wildlife.
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Plastic's effect on human health
Plastic pollution in the ocean is a pressing issue, with marine wildlife suffering the most direct and damaging effects. However, the impact of plastic pollution extends beyond marine life, and human health is also significantly affected.
Plastic waste is often mismanaged, with a substantial amount ending up in the ocean. This mismanagement includes improper disposal, such as littering, which contributes to the spread of toxic chemicals into the environment. These toxic chemicals are released as larger plastic pieces break down into microplastics, which can then be inhaled or ingested by humans. Studies have detected microplastics in human blood, lungs, and even the placenta.
The toxic chemical additives and pollutants in plastics pose a significant threat to human health. These chemicals have been linked to various adverse health effects, including cancer, lung disease, endocrine disruption, and birth defects. Endocrine disruption, or altered hormone activity, can lead to reproductive, growth, and cognitive impairments. The health risks associated with plastic exposure are particularly acute for vulnerable groups, including children, pregnant women, and marginalized communities.
The production of plastics also contributes to greenhouse gas emissions, exacerbating climate change and its associated health risks, including warming temperatures and extreme weather events. The monetary costs of plastic-related health effects are significant, with global costs estimated at $250 billion in 2015 and over $920 billion in the United States alone.
Addressing plastic pollution requires improved waste management practices and policy interventions. The United Nations Environment Assembly is working towards an international treaty to mitigate the impacts of plastic pollution, with over 190 nations committed to addressing plastic production and disposal. Additionally, domestic policies and foreign investments in waste management infrastructure are crucial to reducing plastic pollution and its detrimental effects on human health.
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Frequently asked questions
Plastic is a major contributor to ocean pollution, but there are other factors, including paint shed from shipping, discarded fishing gear, tyre abrasion, construction, and agriculture. Plastic is a significant factor because it is durable and does not biodegrade, so it persists in the ocean for long periods.
Plastic waste that is not recycled, incinerated, or stored in sealed landfills becomes vulnerable to polluting the environment. Rivers carry plastic from land to sea, and coastal cities in middle-income countries are hotspots for plastic emissions. Once in the ocean, plastic is caught up in currents and can spread around the world.
Plastic pollution has a devastating impact on marine wildlife, including fish, turtles, seals, crustaceans, microorganisms, and more. Marine animals can become entangled in plastic or ingest it, leading to injury or death. Plastic pollution also alters habitats and natural processes, reducing ecosystems' ability to adapt to climate change.
To reduce plastic pollution, waste management systems need to be improved, and recycling rates need to increase. There is also a need to reduce the manufacturing of single-use plastics and better design products to minimise plastic waste. Addressing the global plastic pollution crisis requires a combination of domestic policies, foreign investments, and international treaties.
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