Purpose
Good background data are an important requirement in LCA. Practitioners generally make use of LCI databases for such data, and the ecoinvent database is the largest transparent unit-process ...LCI database worldwide. Since its first release in 2003, it has been continuously updated, and version 3 was published in 2013. The release of version 3 introduced several significant methodological and technological improvements, besides a large number of new and updated datasets. The aim was to expand the content of the database, set the foundation for a truly global database, support regionalized LCIA, offer multiple system models, allow for easier integration of data from different regions, and reduce maintenance efforts. This article describes the methodological developments.
Methods
Modeling choices and raw data were separated in version 3, which enables the application of different sets of modeling choices, or system models, to the same raw data with little effort. This includes one system model for Consequential LCA. Flow properties were added to all exchanges in the database, giving more information on the inventory and allowing a fast calculation of mass and other balances. With version 3.1, the database is generally water-balanced, and water use and consumption can be determined. Consumption mixes called market datasets were consistently added to the database, and global background data was added, often as an extrapolation from regional data.
Results and discussion
In combination with hundreds of new unit processes from regions outside Europe, these changes lead to an improved modeling of global supply chains, and a more realistic distribution of impacts in regionalized LCIA. The new mixes also facilitate further regionalization due to the availability of background data for all regions.
Conclusions
With version 3, the ecoinvent database substantially expands the goals and scopes of LCA studies it can support. The new system models allow new, different studies to be performed. Global supply chains and market datasets significantly increase the relevance of the database outside of Europe, and regionalized LCA is supported by the data. Datasets are more transparent, include more information, and support, e.g., water balances. The developments also support easier collaboration with other database initiatives, as demonstrated by a first successful collaboration with a data project in Québec. Version 3 has set the foundation for expanding ecoinvent from a mostly regional into a truly global database and offers many new insights beyond the thousands of new and updated datasets it also introduced.
Bio-based plastics show an evolving market and application range and therefore have become increasingly popular in research and economy. The limitation of fossil resources as well as linked ...environmental issues have led to the development of an innovative bioeconomy and also triggered the shift from fossil-based plastics to bio-based plastics. The original motivation for this study was to propose a comprehensive approach to calculate the sustainability performance of bio-based plastics on a global scale. To provide a calculative basis, a review on available data from life cycle assessment (LCA), social life cycle assessment (S-LCA) and life cycle costing (LCC) studies on bio-based plastics was carried out and showed limited availability of quantifiable results with regard to the social and economic performance of bio-based plastics. In environmental LCA, with the ISO-family and related documents, a group of harmonized standards and approaches does exist. However, missing practical and consented guidelines hamper the comparability of studies and the exploitability of data - not only within the bio-based plastic sector but also in comparison to the fossil-based counterparts. Therefore, a calculation for the global sustainability performance of bio-based plastics was merely conducted for the environmental impact category global warming potential. Taking the technical substitution potential of fossil-based with bio-based plastics as well as limitations in data availability into account the estimation was performed for a substitution of approximately two-thirds of the global plastic demand. The results show, that bio-based plastics could potentially save 241 to 316 Mio. t of CO2-eq. annually. Thereby this study gives a first outlook how bio-based plastics could contribute to a sustainable development, making benefits and drawbacks more tangible.
•Comprehensive review of sustainability studies on bio-based plastics.•Examination of environmental, social and economic aspects.•Estimation of the GWP potential of bio-based plastics for global technical substitution of fossil-based plastics.
Graphitic 1D and hybrid nanomaterials represent a powerful solution in composite and electronic applications due to exceptional properties, but large‐scale synthesis of hybrid materials has yet to be ...realized. Here, a rapid, scalable method to produce graphitic 1D materials from polymers using flash Joule heating (FJH) is reported. This avoids lengthy chemical vapor deposition and uses no solvent or water. The flash 1D materials (F1DM), synthesized using a variety of earth‐abundant catalysts, have controllable diameters and morphologies by parameter tuning. Furthermore, the process can be modified to form hybrid materials, with F1DM bonded to turbostratic graphene. In nanocomposites, F1DM outperform commercially available carbon nanotubes. Compared to current 1D material synthetic strategies using life cycle assessment, FJH synthesis represents an 86–92% decrease in cumulative energy demand and 92–94% decrease in global‐warming potential. This work suggests that FJH affords a cost‐effective and sustainable route to upcycle waste plastic into valuable 1D and hybrid nanomaterials.
Mixed waste plastic can be efficiently upcycled to carbon nanotubes and hybrid nanomaterials. The products have controllable morphologies, and can be synthesized in solvent‐ and inert gas‐free methods. These nanomaterials outperform commercial multiwalled carbon nanotubes in vinyl ester composites, and life‐cycle assessment demonstrates 86–94% improvements in greenhouse gas emissions and energy demand, compared to current nanotube production routes.
Invited for this month′s cover is the group of Prof. Dr. Wee‐Jun Ong at Xiamen University Malaysia. The image shows a model of Xiamen University and is in celebration of the 5th and 100th anniversary ...of Xiamen University Malaysia and Xiamen University, respectively. The cover showcases the institutes as a pillar of renewable nanotechnology research and a key player in the ever‐growing search for sustainable energy. The Research Article itself is available at 10.1002/cssc.202200857.
“…achieving circular economy and carbon neutrality in the long run.” This and more about the story behind the research that inspired the Cover image is presented in the Cover Profile. Read the full text of the corresponding research at 10.1002/cssc.202200857. View the Front Cover here: 10.1002/cssc.202201701.
Life Cycle Assessment (LCA) is increasingly used for decision-making in the design process of buildings and neighbourhoods. Therefore, visualisation of LCA results to support interpretation and ...decision-making becomes more important. The number of building LCA tools and the published literature has increased substantially in recent years. Most of them include some type of visualisation. However, there are currently no clear guidelines and no harmonised way of presenting LCA results. In this paper, we review the current state of the art in visualising LCA results to provide a structured overview. Furthermore, we discuss recent and potential future developments. The review results show a great variety in visualisation options. By matching them with common LCA goals we provide a structured basis for future developments. Case studies combining different kinds of visualisations within the design environment, interactive dashboards, and immersive technologies, such as virtual reality, show a big potential for facilitating the interpretation of LCA results and collaborative design processes. The overview and recommendations presented in this paper provide a basis for future development of intuitive and design-integrated visualisation of LCA results to support decision-making.
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Summary
This article describes the algorithm that has been developed within the European Union (EU) FP7 project DESIRE for the construction of the EXIOBASE multiregional hybrid supply and use tables ...(MR‐HSUTs) version 3. The tables include 43 countries plus five rest‐of‐the‐world regions and are built for the period 2000–2011. MR‐HSUTs are compiled in mixed units, that is, tangible goods in mass units, intangible energy flows in terajoules, and, finally, services in euros. The article summarizes the various steps of the developed procedure, from data collection until the final supply and use tables. It will be shown how several disconnected data sets with varying quality are harmonized so as to build an effective analytical database that can be used for several types of analyses, such as life cycle assessment, total material requirement, material intensity per product service, carbon footprint, and so on.
Summary
Industrial ecology (IE) and life cycle sustainability assessment (LCSA) are increasingly important in research, regulation, and corporate practice. However, the assessment of the social ...pillar is still at a developmental stage, because social life cycle assessment (SLCA) is fragmented and lacks a foundation on empirical experience. A critical reason is the absence of general standardized indicators that clearly reflect and measure businesses’ social impact along product life cycles and supply chains. Therefore, we systematically review trends, coherences, inconsistencies, and gaps in research on SLCA indicators across industry sectors. Overall, we find that researchers address a broad variety of sectors, but only few sectors receive sufficient empirical attention to draw reasonable conclusions while the field is additionally still largely an a‐theoretical one. Furthermore, researchers overlook important social core issues as they concentrate heavily on worker‐ and health‐related indicators. Therefore, we synthetize the most important indicators used in research as a step toward standardization (including critical challenges in applying these indicators and recommendations for their future development), highlight important trends and gaps (e.g., the focus on worker‐ and health‐related indicators and the a‐theoretical nature of the SLCA literature), and emphasize critical shortcomings in the SLCA field organized along the key phases of design, implementation, and evolution through which performance measurement approaches such as SLCA typically progress in their development and maturation. With this, we contribute to the maturation and establishment of the social pillar of LCSA and IE.
Mexico City and its metropolitan area have suffered problems of sustainability in the water system. The main goals of this study were to assess the environmental and social impacts of the water ...system in Mexico City using Life Cycle Assessment (LCA), identify the significant impacts and their sources, and provide a new perspective for a sustainable water system in the city. The entire water system was considered, including the following stages: water abstraction and treatment, transport, distribution, use, sewage collection and wastewater treatment. Social Life Cycle Assessment was performed considering the UNEP/SETAC Guidelines for the Social-LCA of products and the water system workers. We used five subcategories (working hours, fair wage, health and safety conditions, social security and professional development) and 30 indicators of labor conditions.
The results of LCA show that the processes of abstraction, water treatment, transport and distribution combined to produce between 83.9 and 89.6% of the impacts in four of six categories. However, the transportation stage generates the highest environmental impacts due to energy consumption. The wastewater treatment stage avoids environmental impacts in freshwater eutrophication (−69.9%) and non-carcinogenic effects (−86.2%) due to Atotonilco, the new centralized WWTP. The social life cycle assessment results indicated that the transport stage had the best social performance score, with a value of 0.3 on a scale of zero to one. The total system exhibited regular performance in health and safety conditions, with a value of 0.6 in this category. Moving toward a sustainable water system in Mexico City requires analyze future scenarios on the decentralization of potable water services and the implementation of renewable energy technologies in water abstraction and transport to reduce electrical energy consumption and mitigate global warming impacts. Regarding the social dimension, the water system requires stricter policies to monitor the health and safety conditions of workers according to the definition of decent work toward recent sustainable development goals.
This study allowed us to identify the stages with high and low environmental impacts with LCA and, with S-LCA, the best and worst social performance in working conditions. The next step is to complete a sustainability assessment that includes the economic dimension, develop a framework to integrate the three dimensions and propose scenarios to improve environmental and social performance.
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•LCA approach evaluated social and environmental impacts in Mexico City's water system.•Stages of transport, reuse and discharge were the mayor environmental impacts.•S-LCA evaluate the impacts on workers and it used social performance method.•Health and safety category was the worst social performance in the system.•A sustainability analysis was performed with LCA and S-LCA results.
Growing consciousness regarding the environmental impacts of additive manufacturing (AM) processes has led to research focusing on quantifying their environmental impacts using Life Cycle Assessment ...(LCA) methodology. The main objective of this paper is to review the state of the art of the existing LCA studies of AM processes. In this paper, a systematic literature review is carried out where a total of 77 papers focusing on LCA, including social-Life Cycle Assessment (S-LCA), are analyzed. Accordingly, the application of LCA methodology to different AM technologies was studied and different research themes such as the goal and scope of LCA studies, life cycle inventory data for different AM technologies, AM part quality and mechanical properties, the environmental, economic, and social performances of various AM technologies, and factors affecting AM´s sustainability potential were analyzed. Based on the critical analysis of the existing research, five major shortcomings of the existing research are realized: (i) some AM technologies are under studied; (ii) more focus only on the environmental sustainability dimension of AM, neglecting its economic and social dimensions; (iii) exclusion of AM pat quality and its mechanical performance from the sustainability assessment; (iv) not enough focus on the life cycle stages after product manufacture by AM; (v) effect of different product variables on AM´s sustainability not studied extensively. Lastly, based on these shortcomings realized, the following research directions for future works are suggested: (i) inclusion of new AM materials and technologies; (ii) transition to a triple-bottom-line sustainability assessment considering environmental, economic, and social dimensions of AM; (iii) extending the scope of LCA studies to post-manufacture stages of AM products; (iv) development of predictive environmental impact and cost models; (v) integration of quality and mechanical characterization with sustainability assessment of AM technologies.
•Presents state-of-the-art research in the Life Cycle Assessment of AM technologies.•Reviews life cycle inventories across the different stages of AM products´ life cycles.•Compares the environmental, economic, and social impacts of AM and conventional manufacturing (CM) technologies.•Discusses the different factors affecting the sustainability of AM and CM technologies.•Determines the shortcomings of the existing research and provides guidelines for future research.
•The main differences are the extent of the refurbishment and the system boundaries.•The reference of the expected service life needs to be established to facilitate comparison.•Process Analysis is ...the most used LCI method, instead of Input–Output or Hybrid.•Most refurbishment LCAs focus on building energy retrofits: increasing insulation.•The environmental impacts of structure or finishing reparations were not studied.
This review organises and summarises the recent contributions related to the environmental evaluation of building refurbishment and renovation using the lifecycle assessment (LCA) methodology. This paper classifies the recent contributions in this field and selects the primary methodology options. The review shows that most LCAs focus on energy refurbishment, comparing the environmental impacts before and after refurbishment. In contrast, almost none of the LCAs study the environmental impact of building system reparations, such as structure or finishing. The more frequently studied life cycle stages are those related to the manufacturing and use phases. Similarly, the most considered impact categories are the global warming potential and embodied energy. The main barriers found for disseminations are discussed: system boundaries interpretation of EN 15978, functional unit, LCI methods, operational stage and the end-of-life stage definition.
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