Cambridge Prisms: Plastics

Plastic pollution is recognised as one of this century’s most significant environmental challenges and has the characteristics of a super wicked problem. Though researchers and governments around the globe are coming up with promising technological interventions, awareness among citizens and stringent policies are the need of the hour to tackle this issue. A few countries have issued postage stamps and postal materials showcasing the various dimensions of plastic pollution. Historically, stamps depicted every progress, problem and various milestones of humanity spanning multiple fields. We contend that the plastic pollution problems and impact should be depicted through postage stamps from all countries. Through this feat, the message of the need for sustainable usage of plastics for the common good of all species can be spread by showcasing various dimensions of the sustainability of plastic usage in postage materials. This article discusses the rise of plastic pollution, its emerging impacts, and contemporary issues and mitigation strategies through postage stamps and materials. Philately can be a medium for providing environmental awareness, considering the case of plastic pollution. It can be a strong driver to promote consciousness regarding various environmental problems among students undergoing multiple levels of education and the general public.

Disinfection is a standard water treatment process. Plastics are found in various components of water infrastructure and the presence of microplastics in the water cycle raises environmental and human health concerns. Thus, this research investigated the physicochemical impacts of chlorination and chloramination on seven types of virgin and biofouled polymers (125–250 μm) under three disinfectant doses, three pH conditions in potable and recycled water. Our results indicated that both chlorination and chloramination impacted the seven polymers, with polypropylene (PP), expanded polystyrene (EPS) and polyamide (PA) being most impacted, signalling these as polymers of concern. Surface morphological changes were observed. FTIR spectra revealed cleavage of bonds and formation of carbonyl groups indicating degradation. While disinfection is helpful for treating pathogenic microorganisms, the risks of generating microplastics below detection limits are highlighted. Microplastics in disinfected water can lead to biofilm formation, increased adsorption of contaminants and disinfection by-products, compromising water quality and posing challenges for treatment. This research provides valuable insights into the physicochemical impacts of chlorination and chloramination on polymers, enhancing our understanding of their behaviour and fate in water and wastewater environments. While additional ecotoxicological research is needed to fully understand health implications, our study emphasizes the need for targeted intervention strategies of high-use polymers of concern.

Science shows mounting global health risks associated with plastics life cycle pollution. Leveraging evidence and streamlining research to inform policy is critical to safeguarding people and planet. We conducted an electronic survey questionnaire, between 16th April and 16th August 2024, amongst United Nations government delegates developing the Global Plastics Treaty. We explored (1) perceptions and prioritisation of human health evidence, (2) preferred plastic pollution mitigation strategies, and (3) priorities for health research. Responses were collected in Qualtrics and analysed using summary statistics, the Fisher’s Exact Test, and thematically mapped to the Policy Cycle Framework. We received 27 survey responses, balanced by gender and career stage, including 23 countries and all World Bank country income classifications and regions, but greater representation from high-income and European countries. Human health was the highest-ranking concern related to plastics risks (Sum of rank scores (SRS) = 54). Most delegates expressed strong conviction in evidence of risks associated with plastics chemicals, polymers, products, microplastics and broader life cycle emissions. Reducing plastics production (SRS = 53) and eliminating chemicals, polymers and products of concern (SRS = 53) were prioritised, even amongst those affiliated with waste management departments or less convinced of health risks. We found the least regard for recycling as a strategy to protect health (SRS = 4–5) and eliminating open burning was the most prioritised downstream measure (SRS = 15). Generating quantitative, causal data on risks across plastics life cycles, identifying emerging health hazards, defining criteria, safe lists and substitutes for chemicals, polymers and products were government delegate priorities for research, alongside tools to track policy impacts on health and greater bilateral communication between scientists and delegations. Health risks of all forms of plastic pollution were a concern for most delegates responding to our survey. We identified key priorities for policy-driven research to strengthen the science-policy interface and support evidence-based plastics policy that protects human health.

Plastic pollution is a global issue, with microplastics gaining international attention from Non-governmental organizations (NGOs), the government, the public, media and academia; microplastics are a growing source of concern. This research article aims to explore the Cape Town beachgoers’ general knowledge and understanding of microplastic pollution in terms of its potential effects on the environment and human health. Using a questionnaire, the study was conducted at Muizenberg and Lagoon Beach, and involved participants belonging to the age group of <18–64 years. A sampling technique known as convenience sampling was used. This technique allowed individuals to be selected based on their willingness to be part of the sample and their availability; it allowed participants with no obvious knowledge of microplastics to take part. The data were recorded in Excel and analysed with the Statistical Package Social Sciences. Although the public was relatively familiar with microplastics at the time of the study, 40% of the participants from Muizenberg Beach did not know what microplastics are, while 60% knew. In Lagoon Beach, 26.67% did not know what microplastics are, while 73.33% did. Environmental education and the prohibition of microplastics were identified by the majority of respondents as necessary measures for reducing microplastic pollution and further research was suggested, with some of the respondents believing that the lack of strict regulations on plastic use was the greatest difficulty in reducing the pollution from microplastics.

On all levels of governance, there have been varied policy responses to the marine plastic pollution issue. These responses include the development of innovative waste management, circular economy, extended producer responsibility and product stewardship approaches. Non-state actors play important roles in these approaches across global and national levels. Regulatory bodies often experience challenges with implementing sustainable, conservation measures, demonstrating that regulatory measures alone cannot generate the required change to effectively stop marine and terrestrial plastic pollution. Effective plastic pollution governance requires participation from non-state actors in its design, development and implementation. This article examines the gaps that exist in the governance of a plastics circular economy, including the focus on recycling and end-of-pipe/down-cycling solutions and the lack of attention on the other ‘Rs’ that are required for true circularity, for example, refuse, reduce, resell, reuse, repair, refurbish, remanufacture, repurpose and recover energy. We argue that non-state actors can help fill these gaps through multi-stakeholder partnerships, community-led plastic programmes and policies and environmentally and socially responsible industry-based solutions that utilise market-based initiatives. This article explores the roles of non-state actors in plastic policymaking and the gaps and opportunities for non-state actors in the development and implementation of holistic, integrated, ‘whole of life cycle’ and circular economy policies.

Ongoing policy negotiations, such as the negotiations for a future global plastics treaty, include calls for increased recycling of plastics. However, before recycling of plastics can be considered a safe practice, the flaws in today’s systems must be addressed. Plastics contain a vast range of chemicals, including monomers, polymers, processing agents, fillers, antioxidants, plasticizers, pigments, microbiocides and stabilizers. The amounts and types of chemicals in plastics products vary, and there are little requirements for transparency and reporting. Additionally, they are inherently contaminated with reaction by-products and other nonintentionally added substances (NIASs). As the chemical composition of plastics wastes is largely unknown, and many plastics chemicals are hazardous, they therefore hinder safe recycling since recyclers are not able to exclude materials that contain hazardous chemicals. To address this problem, we suggest the following policy strategies: 1) improved reporting, transparency and traceability of chemicals in plastics throughout their full life cycle; 2) chemical simplification and group-based approaches to regulating hazardous chemicals; 3) chemical monitoring, testing and quality control; 4) economic incentives that follow the waste hierarchy; and 5) support for a just transition to protect people, including waste pickers, impacted throughout the plastics life cycle.

Since 1979, plastic companies have significantly expanded their markets. Evidence suggests that excessive plastic use in Ethiopia has exacerbated environmental pollution, contributing to a “quadruple crisis” involving climate change, biodiversity loss, pollution and public health and economic impacts. To address this, the Ethiopian government needs to establish effective plastic waste management strategies. Key future direction and recommendation include (1) Developing and enforcing national strategies, including a ban on many single-use plastics, for sustainable plastic waste management; (2) adopting international best practices and policies to move toward a zero-waste approach; (3) investing in a circular economy and plastic waste management systems; (4) strengthening policies through comprehensive legislation and extended producer responsibility frameworks; (5) establishing a council to integrate scientific research into policymaking; (6) promoting green technologies and innovations, such as plastic waste-to-energy and smart waste management; (7) engaging in global efforts to monitor hazardous chemicals in plastics and support transparency in a toxic-free circular economy to ensure the public’s right to information.

The March 2, 2022, United Nations Environment Assembly Resolution 5/14: “End plastic pollution: Toward an international legally binding instrument by 2024” provides an important path for addressing global plastic pollution, from monomer design and production through the value chain to the final fate of plastic products, including resource recovery. Of the goals set for this effort, simplifying the polymer and additive universe is among the most significant. One primary obstacle to resource recovery from plastic waste is polymer variability, which renders post-use plastic inherently waste-like. While simplification will not address microplastics and leaching of chemicals during use, these measures simplify the plastic universe and mitigate leakage which is critical to ensuring circular plastic use. This study provides a pathway for simplification of formulations through the elimination of problematic additives and revealing paths toward simplifying and reducing the variability in polymers, waste streams and pollution, while preserving critical uses. This study focuses on phenolic antioxidants to support this concept; however, these principles can be applied to other additive classes. The results show extensive duplication of chemical species with different trade names and the appearance of only minor changes to species with the intention of evergreening patents for improved marketability.

Plastics used in agriculture, commonly known as agriplastics (AP), offer numerous advantages in terrestrial agriculture, forestry, fisheries and aquaculture, but the diffusion of AP-intensive practices has led to extensive pollution. This review aims to synthesise scientific and policy discussions surrounding AP, examining evidence of their benefits and detrimental environmental and agricultural impacts. Following the proposal of a preliminary general taxonomy of AP, this paper presents the findings from a survey conducted among international experts from the plastic industry, farmer organisations, NGOs and environmental research institutes. This analysis highlights knowledge gaps, demands and perspectives for the sustainable future use of AP. Stakeholder positions vary on the options of ‘rejection’ or ‘reduction’ of AP, as well as the role of alternative materials such as (bio)degradable and compostable plastics. However, there is consensus on critical issues such as redesign, labelling, traceability, environmental safety standards, deployment and retrieval standards, as well as innovative waste management approaches. All stakeholders express concern for the environment. A ‘best practice’-based circular model was elaborated capturing these perspectives. In the context of global food systems increasingly reliant on AP, scientists emphasise the need to simultaneously preserve nature-based and traditional knowledge-based sustainable agricultural practices to enhance food system resilience.

Serious games are a method that can be used to reach the public on complex topics related to the ocean. Although games used for learning generally, and ocean literacy specifically, have developed gradually since the 1970s, it was not until the popularization of digital games, around the turn of the millennium, that serious games rose to prominence in academia. Since then, vast amounts of serious games research have been published each year – chiefly on digital games, but also increasingly on hybrid and analogue games. In this article, we present results from a series of serious games that were played in three geographical regions in Norway with future-generation stakeholders and tie this to ocean literacy. We report on the potential benefits of serious games for learning and motivation based on these results. The games were played within the context of the United Nations Decade of Ocean Science, the sustainable development goals and multilevel governance, with a special focus on microplastic pollution and jellyfish blooms. We argue that using serious games can be beneficial not just for outreach but also as a tool for unintrusive collection of qualitative data in the form of narratives from transcriptions post-gaming session and contribute to ocean literacy.

Microplastic fibres are found everywhere that researchers have looked for them, from remote mountains to human lungs. However, data are not yet available to facilitate the design of low-shedding textiles. Effective use of standard test methods could establish the impact of processing variables on textile’s propensity to fragment or shed fibres into the environment, allowing industry to design and select lower-polluting materials. Three new test methods are recommended using the widely accessible accelerated laundering equipment used for colour fastness to wash tests. However, the recommended gravimetric analysis of results takes over 8 h per specimen batch, in addition to specimen preparation, testing and effluent filtration, making analysing test results prohibitively time-consuming, and expensive, for many brands. Visual ‘grey scales’ are very commonly used to grade colour fastness test results, and this article proposes the use of an equivalent ‘fibre fragmentation scale’ to dramatically increase the throughput of fibre fragmentation testing and reduce its cost without compromising accuracy or reliability. Mean fibre fragmentation scale grades given by sets of three observers correlated with gravimetric results at 99% confidence. Subjective grades assigned to test specimens, and photographs of test specimens, had significantly lower variability than gravimetric methods at small, ‘more acceptable’, levels of fibre fragmentation.

The world is facing a global plastics crisis with more than 50% of plastics produced only being used once and then discarded. If nothing is done to put an end to plastic pollution, it is projected that by 2050, there will be more plastic (by weight) than fish in the ocean, affecting natural ecosystems, biodiversity and human health. While solutions often target governments and corporations, a crucial group is frequently ignored: informal waste pickers. Despite the limitations of recycling alone, waste pickers significantly impact the plastic recycling chain. This review addresses the gap in our understanding of their role. It argues that waste pickers are an essential component of the larger portfolio of solutions for the plastic crisis but face significant challenges.

In this overview, we examine some of the ways in which archaeologists have increasingly turned their attention to the contemporary world, focusing not on ancient artefacts but on the material legacies that we ourselves are creating and what they tell us about ourselves, including the impact we are having on planetary and human health. One aspect of this “contemporary archaeology” is the study of modern waste, an area of research often referred to as “garbology.” Originating in the later 1960s, this study of modern waste is typically focused on the plastics that characterise what is now commonly referred to as the Plastic Age, a supposedly more familiar past aligning with both cultural experience and memory. The paper emphasises archaeology’s strong interdisciplinary traditions, particularly in its use of scientific methods, which make it easier for archaeologists to work within interdisciplinary teams and with other stakeholders and with policymakers, these being particularly relevant in studies that focus on the contemporary world. The paper concludes by describing how archaeologists are using these perspectives on the contemporary world to cast their eyes forward to the future.

This study provides the first investigation into quantities, types, and potential sources of anthropogenic beach litter in Sierra Leone. Beach litter surveys were conducted monthly at four sites over 11 months. A total of 72,901 litter items (1,246 kg dry weight) were categorised. Across all sites, an average of 1,657 items per 100 m (SD = 1,639) and 28.32 kg per 100 m (SD = 37.48) were recorded. Plastics accounted for 70% of the litter by count and 49% by weight. The three most abundant items by count were plastic bottles (25%), plastic caps and lids (13%), and plastic water sachets (12%). By weight, the three most abundant items were plastic bottles (36%), flip-flops (20%), and shoes (9%). Litter amounts decreased from wet to dry season. We provide the following policy recommendations: improving drinking water access and sanitation, waste management, infrastructure and behaviour change.

The plastic pollution crisis has resulted in the establishment of many voluntary plastic waste initiatives in Southeast Asia, where most of the plastic leakage occurs. This study aims to assess the sustainability of four types of voluntary, partly or fully externally funded plastic waste initiatives within Indonesia’s current waste management system and anticipate challenges that can arise in the future. The research used the qualitative approach of Strengths, Weaknesses, Opportunities and Threats and Internal and External Factors Analysis framework to evaluate the initiatives’ techno-economic, socio-cultural, legislative and environmental sustainability. The results showed that three out of four types of plastic waste initiatives were in the diversification quadrant, and one type was in the survival quadrant. The unfavoured position of the initiatives in the quadrant is mainly due to important regulatory gaps in Indonesia and the lack of a stable funding mechanism. The appropriate strategy for the voluntary plastic waste initiatives to be self-sustainable and a catalyst for sustainable national waste management is to exert pressure on the government to establish an institutionalised and legislated waste management system and endorse a mandatory implementation of the polluter pays principle. Otherwise, improving waste management systems in Indonesia at the macro level could be challenging to achieve.

To mitigate plastic pollution, Resolution 5/14 of the United Nations Environment Assembly established an Intergovernmental Negotiating Committee (INC) tasked with negotiating the Global Plastics Treaty, an ambitious treaty expected to take effect in 2025. This treaty’s success in effectively reducing plastic pollution will depend on the ongoing work of the committee and the existing literature. Herein, I review the literature on the Global Plastics Treaty based on a search of the Web of Science. The data were analyzed, mapped and discussed in depth. The literature indicates an interdisciplinary nature, where Environmental Sciences/Ecology and Government Law are the subject areas with the highest contribution. Plastic pollution is a prominent emerging trend and research topic. Notable gaps include the need for stronger connections among the various directions in the literature and limited collaboration among authors. This work may serve as a basis for other researchers aiming to enhance the literature on the Global Plastics Treaty.

To address the global challenge of plastic waste, 175 UN Member States are negotiating a legally binding instrument, the Plastic Treaty, aimed at ending plastic pollution. This ambitious framework, targeting both terrestrial and marine sources, is being developed through Intergovernmental Negotiating Committee meetings scheduled to conclude by 2025. Amidst uncertainties and power dynamics influencing state positions, this research identifies 10 critical, yet unresolved, points within the treaty negotiations (i.e., the scope of the treaty, equity and differentiation, involvement of non-state actors, integration with existing agreements, standards and specifications, trade implications, monitoring and reporting, responsibility and historical contributions, binding vs. non-binding commitments, and financing and technology transfer). The findings suggest potential compromises in the treaty’s environmental provisions, influenced by domestic interests and international power disparities. As negotiations progress, the imperative for cooperation and decisive action against plastic pollution becomes increasingly pressing, challenging member states to prioritize global environmental integrity over national interests.

Microplastic pollution has become a global environmental challenge, with significant impacts on ecosystems and human health. Microbes have emerged as a promising tool in the combating against microplastic contamination. However, the complex relationship between microbes and microplastics presents both opportunities and challenges, leading to a nuanced understanding of their applications in degradation. This paper provides critical insights into the multifaceted roles of different microorganisms in microplastic degradation. It begins by highlighting the ‘good’ aspects, where several strains of microorganisms show the potential to break down microplastics through enzymatic activities and the formation of biofilms. Conversely, the ‘bad’ aspects of microbial involvement in microplastic degradation are examined. Microorganisms can facilitate the transport and bioaccumulation of microplastics in various ecosystems, potentially exacerbating their harmful effects. The ‘ugly’ side of microplastic degradation includes the production of harmful byproducts during microbial breakdown, raising concerns about secondary pollution and toxicity. The concept of plastisphere is discussed in this context, focusing on the phototrophs, photoheterotrophs and heterotrophs. Novel technologies involving microbial degradation of microplastics are also explained. The work emphasises the need for a comprehensive and balanced approach regarding the application of microorganisms in microplastic degradation and remediation.

Plastic pollution is pervasive in our environment, with impacts seen across ecosystems and taxa. While plastic has become an integral part of our daily lives, not all of it is readily apparent, making it challenging to effectively reduce plastic pollution. A hidden source of plastic pollution is plastic-based printing, which is used on a wide range of items including single-use products like plastic food containers and multi-use plastic items like credit cards. This also includes items that we would not consider to be sources of plastic pollution such as glass bottles with surface printing. The widespread use of this printing, therefore, results in even non-plastic items contributing to plastic pollution, potentially contaminating recycling streams and exacerbating nano- and microplastic (NMP) dispersion. Given the challenges of remediating NMP plastic pollution once it has entered the environment, prevention becomes paramount. With significant efforts underway to reduce plastic production, it is important to take a holistic approach to redesigning objects and materials to avoid false solutions, which will continue to contribute to ecosystem degradation and planetary boundary transgressions. To make meaningful progress and avoid ineffective solutions, it is imperative to consider all sources of plastic pollution, including those concealed within apparently non-plastic objects.

After the second Intergovernmental Negotiating Committee (INC) for the Plastics Treaty meeting in Paris in June 2023, a Zero Draft of the Treaty was released for comment. Member states involved in the treaty negotiations were to respond to the Zero Draft before the third INC meeting in November 2023 in Nairobi. In this paper, we analyse the content and structure of the Zero Draft. We identify parts of the Zero Draft that work and others that will need further attention. These include applicability to different regions; atmospheric input; recycling and waste management; labelling and standards; harmful chemicals; scientific backing; the circular economy; just transition and climate change. We argue that this draft was a useful starting point for further negotiations for member states and the Revised version of the Zero Draft has resolved some of its shortcomings but not all. These are likely to contribute to further debate during future INC negotiations. We conclude with an overview of INC-3 and INC-4 and how the Zero Draft and Revised Zero Draft were received.

Multicomponent systems are representative of the most common real situations as many industrial discharges contain a mixture of several pollutants. This study examines the concurrent adsorption of phenol (PHE) and ciprofloxacin (CIP) onto three types of polyethylene terephthalate microplastics (PET MPs): pristine, acid-modified, and thermal-oxidatively aged. Using extended Langmuir (EL), extended Freundlich (EF) isotherms, and a new artificial neural network (ANN) model, equilibrium adsorption capacities were predicted. The EL isotherm fit for pristine and aged PET MPs, while EF fit for modified PET MPs. Monolayer adsorption capacities ranged from 342.10–3715.73 mg/g for PHE and 2518.23–14498.79 mg/g for CIP, exceeding single-component adsorption. The ANN model used one hidden layer with 3 neurons for pristine and aged PET MPs, and 2 hidden layers with five neurons for modified PET MPs, with a hyperbolic tangent activation function. Models showed excellent performance metrics, including R² values of 0.989–0.999, RMSE of 0.001–0.413, and AAE of 0.009–0.327. Synergistic interactions were observed in the binary system, with PET MPs showing higher selectivity toward CIP. The study demonstrates the effectiveness of PET MPs for binary adsorption of PHE and CIP in aqueous solutions, highlighting their potential for multicomponent pollutant removal.

With the ongoing negotiations for an international legally binding instrument on plastic pollution, including in the marine environment, and the frustration at the end of Intergovernmental Negotiating Committee (INC-3), analyzing the zero draft text, which formed the basis for this negotiation round, is crucial. This analysis examines to what extent the zero draft conveys a clear problem definition as the foundation for an internationally legally binding instrument on plastic pollution. We find that the draft lacks a clear problem definition. Additionally, we investigate how the zero draft balances the focus between marine environments and other affected areas and discusses the implications for governance strategies. We find that the draft focuses particularly on fishing gear and hence has a downstream perspective, while upstream measures are equally important. Furthermore, this study delves into the key motivations driving the treaty negotiations, revealing that health and environmental concerns predominate. In comparing our results with previous research, we align with recent publications analyzing INC submissions and onsite statements. In addition, we identify significant differences in key motivations to tackle the plastic pollution issues between the EU and the international level. These disparities, evident in how health and economic arguments are prioritized, reflect varied approaches to combating plastic pollution across political spheres.

Microplastics pollution is a widely recognized issue, although significant analytical challenges remain to be overcome in order to achieve a more comprehensive ecological understanding. The complex nature of this pollutant, with its variable physical and chemical properties, presents considerable challenges when it comes to establishing standardized methods for studying it. One crucial factor that influences its toxicity is particle size, yet even this parameter lacks a well-established framework, especially in the case of nanoplastics. Although the size range limits are already proposed in the literature, where the most acceptable values for microplastics are from 1 to 5,000 μm and for nanoplastics are from 1 to 1,000 nm, we propose narrowing these limits to 0.1–1,000 μm and 10–100 nm, respectively. We based our discussion on conceptual terminology, polymer structure and toxicity, highlighting the significance of accurately defining their size range. The standardization of these limits will allow the development of more efficient approaches to studying this pollutant, enabling a comprehensive understanding of its ecological consequences and potential risks.

The washing of synthetic materials has been named as the largest contributor of microplastic pollution to our oceans. With the consumption of petrochemical-based synthetic materials expected to grow, due to an increased demand, the release of microplastic fibres to our environments is expected to also accelerate. To combat microplastic fibre release, this study explores source-directed interventions within the design and manufacturing process of textiles to reduce the amount of pollution released from the surface and the edges of the fabric structure. Using standardised wash tests and polyester fabric swatches that were created in-house with systematic structural adjustments, single jersey knit fabrics were shown to release over three times more microplastic pollution than twill woven fabric. This illustrates that increasing the tightness of a fabric could be implemented within the design of fabrics for environmental benefits. Additionally, the laser cutting technique reduced microplastic fibres released by over a third compared to scissor cutting and overlock serging, showing that the edge of the fabric is a significant source of microplastic pollution released during laundering. This research highlights the adaptable and innovative eco-design approaches to clothing production which is necessary to help the sector reach international sustainability targets and regulations.