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Finance plastics reuse, redesign, and reduction
... More than 400 million tons of petroleum-based plastic products are produced annually [2] and incineration of petroleum-based plastic products is a major source of CO 2 emissions. Currently, only about 10% of plastics are recycled [3] and some of these plastics are discharged into the ocean, becoming a source of marine plastic pollution [4]. To address these environmental problems, alternative materials that are sustainable and have a low environmental impact are needed. ...
... The cell structure of each species of wood differs, especially in the amount of porosity. The density of the ulin is ρ ≈ 1.09 g/cm 3 , and that of Japanese cedar is ρ ≈ 0.42 g/cm 3 in this experiment. The density was measured using the method outlined in Section 2.3. ...
... Ulin became flowable when the temperature was 180 to 200 • C, and the maximum wall height without any defects was 40 mm. The density of the container ranged from 1.3 to 1.5 g/cm 3 . In contrast, Japanese cedar was less flowable and could not be formed into a container with uniform density. ...
This paper presents a method for applying forging to high-density wood. A cylindrical container was formed using a closed die, and the appropriate conditions for temperature and punch length were evaluated. Ulin, which is a high-density wood, and Japanese cedar, which is a low-density wood and widely used in Japan, were used as test materials. The pressing directions were longitudinal and radial based on wood fiber orientation, and the shape and density of the resulting containers were evaluated. In the case of ulin, cracks decreased by increasing the temperature, while temperature had little effect on Japanese cedar. Containers without cracks were successfully formed by using a punch of appropriate length. The density of the containers was uniform in the punch length l = 20 and 40 mm in the L-directional pressing and l = 20 mm in the R-directional pressing when using ulin, with an average density of 1.34 g/cm³. This result indicates the forging ability of ulin is high compared to that of commonly used low-density woods. In summary, this paper investigated the appropriate parameters for forging with ulin. As a result, products of more uniform density than products made by cutting were obtained.
... Reuse initiatives are placed high on the waste hierarchy and considered a higher priority and more desired system to achieve a CE (Potting et al., 2016;Kirchherr et al., 2017); however, currently, only 4% of investment capital is directed to reuse solutions (Mah, 2021;Wang et al., 2023). Reuse systems extend the lifespan of a product and materials with minor adaptations or restoration (Vermeulen et al., 2019). ...
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.
The extensive utilization of plastic, as a symbol of modern technological society, has consumed enormous amounts of finite and non-renewable fossil resources and produced huge amounts of plastic wastes in the land or ocean, and thus recycling and reuse of the plastic wastes have great ecological and economic benefits. Closed-loop recyclable polymers with inherent recyclability can be readily depolymerized into monomers with high selectivity and purity and repolymerized into polymers with the same performance. They are deemed to be the next generation of recyclable polymers and have captured great and increasing attention from academia and industry. Herein, we provide an overview of readily closed-loop recyclable polymers based on monomer and polymer design and no-other-reactant-involved reversible ring-opening and addition polymerization reactions. The state-of-the-art of circular polymers is separately summarized and discussed based on different monomers, including lactones, thiolactones, cyclic carbonates, hindered olefins, cycloolefins, thermally labile olefin comonomers, cyclic disulfides, cyclic (dithio) acetals, lactams, Diels-Alder addition monomers, Michael addition monomers, anhydride-secondary amide monomers, and cyclic anhydride-aldehyde monomers, and polymers with activatable end groups. The polymerization and depolymerization mechanisms are clearly disclosed, and the evolution of the monomer structure, the polymerization and depolymerization conditions, the corresponding polymerization yield, molecular weight, performance of the polymers, monomer recovery, and depolymerization equipment are also systematically summarized and discussed. Furthermore, the challenges and future prospects are also highlighted.
In the USA, 8.66% of municipal solid waste (MSW) plastic was recycled and 75.9% landfilled (2018). Some critical challenges in widespread adoption of post-consumer recycled (PCR) plastic include high collection costs, sortation complexity, inconsistent feedstock properties, and unknown contamination leading to safety considerations. The objective of this review is to discuss global Extended Producer Responsibility (EPR) policies/regulations and their ability to facilitate coordination of domestic/international policies and business to overcome critical recycling complications. Global EPR and recycling laws were examined to compare and contrast initiatives to increase recycling and avoid plastic waste generation. EPR laws increase producers’ liability towards product generation, marketing, and disposal by applying fees and taxes on products depending on product recyclability and volume generation. Countries with established plastic EPR regulations and landfill bans often possess higher recycling rates. The results of this research can facilitate development of local regulatory mandates to increase recycling rates.
The marine plastics crisis sparked a wave of corporate interest in the circular economy, a sustainable business model that aims to eliminate waste in industrial systems through recycling, reduction, reuse, and recovery. Drawing on debates about the role of corporations in global environmental governance, this article examines the rise of the circular economy as a dominant corporate sustainability concept, focusing on the flagship example of the circular economy for plastics. It argues that corporations across the plastics value chain have coordinated their efforts to contain the circular economy policy agenda, while extending their markets through developing risky circular economy technologies. These corporate strategies of containment and proliferation represent attempts to “future-proof” capitalism against existential threats to public legitimacy, masking the implications for environmental justice. The paradox of the circular economy is that it seems to offer radical challenges to linear “take-make-waste” models of industrial capitalism, backed by international legislation, but it does not actually give up on unsustainable growth. We need to tackle the plastics crisis at its root, dramatically reducing the global production of toxic and wasteful plastics.
A mess of plastic
It is not clear what strategies will be most effective in mitigating harm from the global problem of plastic pollution. Borrelle et al. and Lau et al. discuss possible solutions and their impacts. Both groups found that substantial reductions in plastic-waste generation can be made in the coming decades with immediate, concerted, and vigorous action, but even in the best case scenario, huge quantities of plastic will still accumulate in the environment.
Science , this issue p. 1515 , p. 1455
Reusing plastics and other materials is not enough. To achieving a circular economy, we must make less stuff to begin with. Reusing plastics and other materials is not enough. To achieving a circular economy, we must make less stuff to begin with.