Ethan Clarke
Plastic pollution is a pressing global issue, with plastic waste persisting in the environment for hundreds or even thousands of years. Plastic additives, which are not covalently bound, can freely leach into the environment, causing significant ecological and human health risks. These additives are toxic and have been detected in various environmental settings, including the food chain and the air. With the steep rise in plastic production and plastic waste, understanding the impact of plastic additives on the environment is crucial for mitigating potential harm to humans and nature.
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What You'll Learn
Plastic additives are toxic to biota and humans
Plastic additives are toxic to both biota and humans. They have been found to cause significant toxicities in every kind of biota exposed to them. The toxic chemical additives and pollutants found in plastics threaten human health on a global scale. Scientific results indicate that plastics cause diseases, disabilities, and premature death at every stage of their life cycle.
Plastics are derived from fossil fuels, including natural gas and crude oil, and also contain chemicals known as endocrine disruptors, which threaten human health. Endocrine disruption can cause reproductive, growth, and cognitive impairment. Humans are exposed to plastics through daily life products, plastic-based medical supplies, the food chain, and airborne plastic pollution. Recent studies have found microplastics in human blood, lungs, placentas, breast milk, and meat, milk, and blood of farm animals.
The refinement of plastics emits an additional 184 to 213 million metric tons of greenhouse gases each year. Landfills, where single-use plastics are sent, account for more than 15% of methane emissions. Plastic pollution affects the most vulnerable communities first, as developed countries send plastic to developing countries for processing. This leads to these communities becoming overwhelmed with plastic waste and struggling to dispose of it.
Plastic additives are subjected to trophic transfer in different food webs, and due to their occurrence in various environmental settings, they exert significant ecotoxicity. The unrestricted production and use of plastic additives cause a substantial environmental burden, and information on their ecotoxicity is still incomplete. However, it is clear that plastic additives have detrimental effects on both biota and humans.
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Plastic waste is a burden on marine and terrestrial environments
The average person may be ingesting approximately 5 grams of plastic every week, and the health impacts of this are still a relatively new research area. However, scientific results to date indicate that plastic causes diseases, disabilities, and premature death at every stage of its life cycle. The toxic chemical additives and pollutants found in plastics threaten human health on a global scale, causing cancer and changing hormone activity (known as endocrine disruption), which can lead to reproductive, growth, and cognitive impairments.
The production, use, and disposal of plastics also contribute to climate change. The refinement of plastics emits an additional 184 to 213 million metric tons of greenhouse gases each year, with the production and conversion of fossil fuels into new plastic products responsible for 90% of emissions in the plastic industry. Landfills, where single-use plastics are sent, account for more than 15% of methane emissions, and the size of landfills increases with the amount of plastic waste disposed of in them. An enormous mass of plastic in the Pacific Ocean, twice the size of Texas, continues to grow, and plastic waste disproportionately affects vulnerable communities and developing countries that receive plastic waste from developed nations for processing.
Plastic waste is a burden on both marine and terrestrial environments, with far-reaching consequences for human health, biodiversity, and climate change. Sound recycling of plastics is the best waste management and sustainable option to address this global problem.
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Plastic production contributes to greenhouse gas emissions
Plastic additives have had a significant impact on the environment and human health. Plastic pollution is found all over the globe and negatively affects people and the environment at every stage of its lifecycle, including extraction, production, manufacturing, use, recycling, and disposal.
Plastic production and disposal emit around 3% of global emissions. However, some sources state that plastic production emits over 5% of global greenhouse gas emissions. The life-cycle emissions of plastics, which include the production of the material and its disposal, were estimated at 1.8 billion tonnes by the OECD. Most of these emissions come from the production stage and are in the form of carbon dioxide.
The production of plastics is greenhouse-gas intensive due to the refining of hydrocarbons and the production of other plastic ingredients. For example, emissions from manufacturing ethylene, the building block for polyethylene plastics, were 184.3 to 213 million metric tons of carbon dioxide equivalent in 2015. Globally, carbon dioxide emissions from ethylene production are projected to increase by 34% between 2015 and 2030.
The extraction and transportation of fossil fuels, which are the feedstocks for plastic production, are also carbon-intensive activities. The CIEL report estimated that 12.5 to 13.5 million metric tons of carbon dioxide equivalent are emitted per year while extracting and transporting natural gas for plastic production in the United States. Land disturbance caused by pipeline development also contributes to greenhouse gas emissions associated with extraction.
The increase in plastic production over the last 60 years is due to the inexpensive, multipurpose, durable, and lightweight nature of plastics. However, with increased production comes increased waste, creating challenges for the waste management industry. If the reliance on plastics persists, the sector's fossil fuel consumption and associated greenhouse gas emissions will continue to grow.
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Plastic pollution affects vulnerable communities first
Plastic pollution is a pressing global issue that affects all communities, but vulnerable and marginalised communities bear the brunt of its consequences. The production, use, and disposal of plastics have severe environmental and health impacts, which disproportionately affect those living in close proximity to plastic production and waste sites. This includes communities near oil plants and refineries, as well as those engaged in plastic recycling and waste management.
The plastic lifecycle, from extraction to disposal, exposes vulnerable communities to toxic chemical additives and pollutants. These additives are not covalently bound and can easily leach into the environment, contaminating the air, soil, and water. As a result, people in these communities may experience respiratory symptoms, adverse neurological effects, and an increased risk of cancer and reproductive issues. Children, in particular, are vulnerable to the health risks associated with plastic pollution, as they may inadvertently ingest toxic substances while playing or come into direct skin contact with contaminated materials.
Marginalised communities near marine ecosystems are also severely impacted by plastic pollution. The accumulation of plastic waste in oceans and other water bodies interferes with the absorption of carbon dioxide by marine microorganisms and disrupts the production of algae. This has implications for climate change and can endanger the livelihoods of those who depend on marine resources for their income and food supply. Furthermore, the plastic industry's economic and political power often allows them to transfer the cost and burden of pollution to these vulnerable communities, who may lack access to credible judicial systems to address these injustices.
The COVID-19 pandemic has further exacerbated the plastic pollution crisis, with plastic waste becoming a significant part of the global pollution emergency, alongside biodiversity loss and climate change. Strong and effective action plans are needed to tackle this triple emergency, and governments must prioritise the needs of those disproportionately affected by plastic pollution. This includes expanding plastic waste monitoring, studying its health impacts, and investing in waste management and sustainable alternatives. It is crucial to include affected communities in decisions regarding plastic production, use, and disposal, ensuring environmental justice and safeguarding the health and well-being of vulnerable populations.
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Plastic additives are transferred through food webs
Plastic additives are toxic chemical compounds that are not covalently bound to plastics and, as such, can freely leach into the environment. They are used to enhance the properties of polymers and are present in all plastic products. Due to their presence in various environmental settings, these additives exert significant ecotoxicity, affecting every kind of biota exposed to them.
The unrestricted production and use of plastic additives have resulted in a substantial environmental burden. Plastic pollution is found everywhere, from the top of Mount Everest to the deepest parts of the ocean, and is persistent, taking anywhere from 100 to 1000 years or more to decompose, depending on environmental conditions. This pollution fragments into microplastics, which are found in every ecosystem on Earth, including the Antarctic tundra and tropical coral reefs.
Microplastics have been detected not only in the environment but also in the food and blood of farm animals, as well as in human breast milk, blood, lungs, and placentas. This indicates that plastic additives are transferred through food webs, with potential health consequences. The health effects of plastic exposure are still being researched, but current findings indicate that plastics can cause diseases, disabilities, and premature death at every stage of their life cycle.
The toxic chemical additives in plastics have been linked to specific health issues, including cancer and endocrine disruption, which can lead to reproductive, growth, and cognitive impairments. These additives persist in the environment and bioaccumulate in exposed organisms, further exacerbating their impact. The discharge of plastic waste into the environment, particularly into marine ecosystems, poses a significant threat to aquatic life and human health.
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Frequently asked questions
Plastic additives are the various chemical substances used to enhance the properties of plastic polymers, making them more durable and lightweight.
Plastic additives are released into the environment during the use, disposal, and recycling of plastic materials. Inappropriate waste management practices can lead to the undesirable release of these additives, which can then contaminate soil, water, and air.
Plastic additives have significant toxicities and pose a threat to the ecosystem and human health. They can act as carriers for other contaminants, leaching toxic chemicals into the environment. Plastic pollution can alter habitats, reduce ecosystems' resilience to climate change, and directly affect human health through the ingestion of microplastics.
Sound recycling practices and waste management strategies are crucial for reducing the release of plastic additives into the environment. Additionally, transitioning to eco-friendly alternatives, such as biodegradable plastics or non-plastic materials, can help minimise the ecological and health risks associated with plastic additives.
