Bronte Wells
Plastic pollution is the accumulation of plastic objects and particles in the Earth's environment, which has harmful effects on humans, wildlife, and their habitats. The main source of plastic pollution is plastic waste that has been mismanaged – not recycled, incinerated, or kept in sealed landfills. This waste often ends up in rivers, which transport it to the sea. A significant proportion of plastic pollution comes from middle-income countries, particularly in Asia, which has been attributed to factors such as high coastal population density and intense seasonal rainfall. Improving waste management practices and reducing the consumption of single-use plastics are crucial steps in tackling the global issue of plastic pollution.
| Characteristics | Values |
|---|---|
| Sources of plastic pollution | Land-based sources, marine sources, rivers, coastal cities, countries, mismanagement of waste |
| Percentage of plastic pollution from land-based sources | 70% to 80% |
| Percentage of plastic pollution from marine sources | 20% to 30% |
| Percentage of plastic pollution that is mismanaged | 25% |
| Percentage of plastic pollution from rivers | 80% |
| Top 10 emitting rivers' contribution to plastic pollution | 18% |
| Top 1,656 rivers' contribution to plastic pollution | 80% |
| Region emitting the most plastic pollution | Asia |
| Percentage of ocean plastics emitted from Asia | 81% |
| Countries with the highest plastic emissions | Philippines, India, Malaysia, Indonesia, Thailand, China, Brazil, Egypt, Japan, Russia, Vietnam |
| Percentage of oceanic plastic pollution emitted by OECD countries | 5% |
| Annual global plastic production | 460 million metric tons |
| Percentage of plastic pollution caused by single-use products | 40% |
| Examples of single-use products | Bottles, caps, cigarettes, shopping bags, cups, straws |
| Companies with the most plastic waste | Coca-Cola, Nestlé, Pepsico |
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What You'll Learn
Mismanaged plastic waste
Plastic pollution is the accumulation of plastic objects and particles (e.g. plastic bottles, bags, and microbeads) in the Earth's environment, which adversely affects humans, wildlife, and their habitats. When plastic waste is mismanaged – not recycled, incinerated, or kept in sealed landfills – it becomes an environmental pollutant.
Around one-quarter of plastic waste is mismanaged, making it vulnerable to polluting the environment. Mismanaged waste tends to be much higher in low-to-middle-income countries due to poorer waste management infrastructure. A 2017 study estimated that Asian countries contributed 86% of plastic emissions to the ocean. The top ten emitting rivers contribute a much smaller amount than previously thought: just 18% of plastics compared to 56% and 91% from previous studies. To account for 80% of river plastics, one must consider the top 1,656 rivers.
The probability that mismanaged plastic waste enters the ocean varies across the world, depending on factors such as the location and length of river systems, proximity to coastlines, terrain, and precipitation patterns. Rivers are the primary transport of plastics into marine ecosystems, sourcing potentially 80% of the plastic pollution in the oceans. The Yangtze River into the East China Sea is identified as the highest plastic-emitting river by some studies.
To tackle plastic pollution, it is crucial to improve the management of plastic waste, especially in poorer countries, where most ocean plastics come from. This includes implementing tighter waste management systems with fewer 'leaks' and more robust waste collection, as well as focusing on prevention and reducing waste generation.
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Plastic in rivers
Plastic pollution is a global environmental threat, with plastics found in soils, lakes, rivers, and oceans. Rivers are a major source of plastic waste in the oceans, with around 1000 rivers accountable for nearly 80% of global annual riverine plastic emissions, ranging from 0.8 to 2.7 million metric tons per year. Small urban rivers are among the most polluting.
The presence of plastics in the oceans was first identified in the 1970s, and since then, plastic production and waste generation have become a critical issue. The annual production of plastics has increased nearly 230-fold in the last seven decades, with 460 million tons produced in 2019 alone. The rapid growth in plastic production has led to a significant increase in plastic waste, with an estimated 82 million tons of plastic waste mismanaged globally each year. Of this, about 5.8 million tons end up in rivers, contributing to the plastic pollution in these water bodies.
Rivers are a natural pathway for nutrients and sediments from the land to the ocean, and they also play a significant role in transporting plastics from land to the sea. Studies have estimated that 70% to 80% of the plastic in the oceans is transported from land via rivers or coastlines. The remaining 20% to 30% comes from marine sources such as fishing nets, lines, ropes, and abandoned vessels.
The accumulation of plastics in rivers is a significant issue, with observational evidence suggesting that most plastics may accumulate in and around rivers rather than being exported to the sea. The midpoint estimates for microplastics in rivers range from 31 kilotons to 2.31 million tons per year, while the range for macroplastics is 0.15 tons to 1 million tons per year. These estimates vary due to different observational data and the inclusion of factors such as river catchment characteristics, population, and settlement distribution.
The impact of plastic pollution in rivers is not limited to the rivers themselves but also affects the marine ecosystems downstream. It is estimated that plastic pollution reduces the value of marine ecosystem services by $500 to $2500 billion per year. To address this issue, organizations like The Ocean Cleanup are developing Interceptor solutions to tackle the 1000 most polluting rivers. These Interceptors aim to stop the inflow of plastic into the oceans by extracting waste from the river and bringing it onshore for proper disposal and recycling where possible.
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Plastic in oceans
Plastic pollution in the oceans is a pressing global crisis. It is estimated that 1 to 2 million tonnes of plastic enter our oceans each year, with billions of pounds of plastic already present in the ocean. This plastic pollution has a detrimental impact on marine ecosystems, wildlife, and habitats.
The primary sources of plastic in the oceans are land-based, with 70% to 80% of plastic transported from land to sea via rivers or coastlines. Rivers are the main transporters of plastic into the oceans, with Asian rivers, in particular, contributing the majority of plastic emissions. A 2021 study identified the top 1,000 rivers worldwide as accounting for almost 80% of ocean plastic emissions. The Yangtze River into the East China Sea is one of the highest plastic-emitting rivers, influenced by high-density coastal populations and intense seasonal rainfall.
The remaining 20% to 30% of ocean plastic comes from marine sources, such as fishing nets, lines, ropes, and abandoned vessels. Fishing gear and nets constitute a significant portion of marine plastic pollution, with derelict fishing nets and gear causing entanglement and harm to marine life.
The accumulation of plastic in the oceans is a result of the increasing consumption of plastic products and improper waste management practices. While high-income countries have effective waste management systems, middle-income countries, particularly in Asia, struggle with inadequate waste management infrastructure, contributing to higher emissions.
The consequences of plastic pollution in the oceans are severe. Marine animals, such as seabirds, sea turtles, seals, and whales, are affected by ingestion of plastic or entanglement. Microplastics, formed from larger plastic items breaking down, absorb harmful pollutants and release them into the ocean, further exacerbating the issue. With plastic production projected to increase, urgent action is needed to address this crisis and prevent further harm to our oceans and marine life.
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Single-use plastics
The plastic industry has been criticised for promoting "chemical recycling," a process that often involves incineration and releases harmful substances. To address this issue, governments and local authorities have implemented single-use plastic bans and restrictions, particularly on plastic bags, straws, and other small items. These bans have been successful in reducing plastic consumption, with notable examples in California, Australia, and Africa.
To combat single-use plastic pollution, experts recommend reducing the manufacturing of these products, improving waste management systems, and encouraging the use of reusable alternatives. Collective action is necessary to curb the use of single-use plastics and protect our planet from the detrimental effects of plastic pollution.
The impact of single-use plastics on the environment is significant and far-reaching. Plastic pollution has been found in all ecosystems, including marine environments, where it poses a severe threat to wildlife. Species such as birds, whales, fish, and turtles mistake plastic waste for food, leading to internal injuries, starvation, and reduced ability to swim and fly. Plastic pollution also contributes to the transmission of vector-borne diseases and has been detected in a majority of the world's tap water, posing potential health risks to humans.
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Plastic in developing nations
Plastic pollution is a pressing issue in developing nations, where the majority of unmanaged and mismanaged plastic waste is found. This waste stems from imports from Organisation for Economic Co-operation and Development (OECD) countries and is exacerbated by limitations in economic resources, governance, capacity, and infrastructure within developing countries. The consequences of this plastic waste crisis include environmental degradation, health hazards, and negative impacts on livelihood security, economic development, and cultural ways of life.
Developing countries face significant challenges in addressing plastic waste due to limited economic and political capacity, as well as inadequate infrastructure for collection, reuse, and recycling. The Locally Managed Decentralized Circular Economy (LMDCE) approach has been suggested as a promising strategy for infrastructure-limited regions, empowering local communities to take control of their plastic waste management supply chain while retaining social, economic, and environmental benefits locally.
In the context of plastic pollution, developing nations often have higher levels of mismanaged waste due to poorer waste management infrastructure. This waste enters the environment through various pathways, including runoff and erosion, ultimately polluting land, waterways, and oceans. Rivers play a significant role in transporting plastics into marine ecosystems, with Asian rivers contributing the highest amount of plastic waste found in the ocean annually.
To reduce plastic pollution, developing nations can explore sustainable alternatives to plastic packaging, such as biodegradable jute liners, compostable sacks, and seaweed-based bioplastics. Implementing circular economy policies, including Extended Producer Responsibility (EPR) and South-South collaborations, can drive innovation and sustainability in these countries. Additionally, enhancing recycling infrastructure and offering incentives for recovering and repurposing agricultural residues can help reduce plastic dependency.
While most plastic pollution in the ocean comes from land-based sources, a significant portion also originates from marine sources such as fishing nets, lines, ropes, and abandoned vessels. This highlights the importance of addressing plastic pollution in developing nations, as they contribute significantly to ocean plastic pollution, which affects wildlife, ecosystems, and human communities.
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Frequently asked questions
Most of the plastic in the ocean comes from land-based sources, with 70% to 80% of plastic being transported from land to sea via rivers or coastlines. The remaining 20% to 30% comes from marine sources such as fishing nets, lines, ropes, and abandoned vessels.
Asia is the largest contributor of plastic to the ocean, with 81% of ocean plastics emitted from the region. This is due to a combination of factors, including high-population density and intense seasonal rainfall. Africa contributes 8%, South America 5.5%, North America 4.5%, and Europe and Oceania contribute less than 1%.
Plastic waste enters the ocean due to improper disposal and mismanagement of waste. This includes littering, illegal dumping, and overflowing containment structures. Rivers act as conveyor belts, picking up trash as they move downstream, with the top 1,656 rivers contributing to 80% of river plastic emissions globally.
