urban metabolism
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2022 ◽  
Vol 178 ◽  
pp. 106017
Author(s):  
Haodong Lv ◽  
Lin Yang ◽  
Jinsheng Zhou ◽  
Xian Zhang ◽  
Wenjing Wu ◽  
...  

Author(s):  
Anna Petit-Boix ◽  
Defne Apul ◽  
Thomas Wiedmann ◽  
Sina Leipold

Abstract Seeking to meet sustainability targets, cities are promoting a number of circular economy initiatives. Whether or not these actions help cities to approach sustainable resource management is often unclear. To identify, prioritize and monitor resource-efficient strategies, cities can look for targets and indicators among the Sustainable Development Goals (SDGs). While the SDGs provide useful goals, they lack applicable and accurate indicators for cities. To address this shortcoming, we link the SDGs to the urban circular economy by looking at the urban metabolism and identify monitoring needs and gaps. Although consumption-based footprint indicators are the most suitable approach, these are barely covered in the SDGs. We propose a framework facilitating transdisciplinary projects and experimentation to assess resource footprints and prioritize circular strategies in cities. Our discussion will guide practitioners and academics towards a sustainable circular transformation in cities.


Foods ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 2842
Author(s):  
Li Xing ◽  
Tao Lin ◽  
Xiongzhi Xue ◽  
Jiakun Liu ◽  
Meixia Lin ◽  
...  

Food consumption is fundamental for urban households if they are to sustain production and daily life. Nitrogen resulting from food consumption has significantly contributed to pollutant emissions in urban ecosystems. Taking Xiamen city, a rapid urbanizing area of southeast China as a case study, we evaluated the food-sourced nitrogen consumption of households based on a large simple onsite questionnaire survey, as well as differences between households in the consumption of plant-based and animal-based foods. A material flow analysis (MFA) was conducted to simulate the urban metabolism of food-sourced nitrogen and environmental emissions among different income groups. The impacts of household attributes, plant-based food consumption, and animal-based food consumption on environmental nitrogen emissions were examined with a structural equation model (SEM). Our results show that the surveyed households’ diets were more plant-based and less animal-based. Aquatic products and livestock were the source of 43.7% of food-sourced nitrogen, and 84.5% of the food-sourced nitrogen was discharge into the environment through direct discharge and waste treatment. Soil, water, and air emissions accounted for 62.8%, 30.1%, and 7.1% of the food-sourced nitrogen, respectively. Household income, household size, and household area are all associated with accelerating increases of nitrogen emissions released into the environment, though middle-income group households have the highest food-sourced environmental nitrogen emissions. On this basis, we discuss how to better manage the urban metabolism of food-sourced nitrogen, so as to improve urban household consumption, lower nitrogen emissions, and improve food security.


2021 ◽  
Vol 13 (22) ◽  
pp. 12724
Author(s):  
Antonio Valero ◽  
Jorge Torrubia ◽  
Miguel Ángel Anía ◽  
Alicia Torres

This paper proposes a holistic vision of the urban metabolism (UM), viewing the city as a subsystem within an industrial ecosystem (IE) in which municipal-industrial symbiosis is essential to achieve sustainability goals. For this purpose, the metabolism of a large Spanish city, Zaragoza, was studied by analyzing the main fractions of its MSW. A methodology based on carbon footprint (CF) was developed to analyze the environmental impact—in terms of CO2—of the influence of households’ behavior, the City Council’s strategies, and the main MSW fractions. Zaragoza’s IE represents a footprint of 931,250 CO2 tons for the fractions studied, of which 438,000 CO2 tons are due to organic fraction, 180,371 to plastics and 154,607 to paper and cardboard, which are the three most significant contributors. If households selectively separated 100% of their waste, the footprint would drop to 648,660 tons of CO2. Furthermore, monetary savings were quantified through the CO2 emissions price. The proposed methodology accounts for the CF of the whole IE, not just the city. Moreover, it enables the creation of Sankey diagrams to visualize the distribution of emissions of each subsystem, highlighting the importance of cooperation between the city and its recycling industries to reduce its CF.


Biomimetics ◽  
2021 ◽  
Vol 6 (4) ◽  
pp. 64
Author(s):  
Andrea Quintero ◽  
Marichell Zarzavilla ◽  
Nathalia Tejedor-Flores ◽  
Dafni Mora ◽  
Miguel Chen Austin

To understand the sustainability problem for Panama’s metropolitan area, its urban metabolism was investigated. A way to evaluate its current state was obtained by estimating a sustainable indicator based on the Green City Index. With the abstraction of the identified problems, the biomimetic strategy “problem-based approach” was carried out, where different pinnacles of nature were selected as a reference for the design of regenerative solutions. These were inspired by the understanding of the living world and how to include ecosystems in urban designs. Therefore, a framework was proposed for positive generation and natural solutions in cities to take advantage of the regenerative potential in Panama City. Using ecosystem services, a set of indicators were developed to measure regeneration over the years at the city scale. The results indicate that from the 11 selected pinnacles, 17 solutions inspired in nature were proposed to regenerate cities. Consequently, a SWOT analysis was realized along with a questionnaire by experts from different fields. The findings obtained show that the feasible solutions were: arborization, green facades, solar roofs, e-mobility, green corridors, bicycle lanes, sidewalks, and biofilters. This research represents a step towards creating and developing regenerative cities, thus improving the quality of life of living beings and ecosystems present in society.


2021 ◽  
pp. 089692052110205
Author(s):  
Mahito Hayashi

This paper aims to expand critical urban theory and spatialized political economy through developing a new, broad-based theoretical explanation of homelessness and the informal housing of the deprived in public spaces. After reviewing an important debate in geography, it systematicallyreasserts the relevance of class-related concepts in urban studies and, mobilizing post-determinist notions, it shows how a class-driven theory can inform the emergence of appropriating/differentiating/reconciliating agency from the material bedrock of urban metabolism and its society-integrating effect (societalization). The author weaves an urban diagnostic web of concepts by situating city-dwellers—classes with(out) housing—at the material level of metabolism and then in the sociopolitical dynamic of regulation, finding in the two realms urban class relations (enlisted within societalization) and agency formation (for reregulation, subaltern strategies, and potential rapprochement). The housing classes are retheorized as a composite category of hegemonic dwellers who enjoy housing consumption and whose metabolism thus appears as the normative consumption of public/private spaces. Homeless people are understood as a subaltern class who lacks housing consumption and whose metabolism can produce “housing” out of public spaces, in opposition to a hegemonic urban form practiced by the housing classes. These urban class relations breed homeless–housed divides and homeless regulation, and yet allow for agency’s creative appropriation/differentiation/reconciliation. This paper avoids crude dichotomy, but it argues that critical urban theory can productively use this way of theorization for examining post-determinist urban lifeworlds in relation to the relative fixity of urban form, metabolic circuits, and class relations.


2021 ◽  
Vol 2042 (1) ◽  
pp. 012020
Author(s):  
N S Wiedmann ◽  
A Athanassiadis ◽  
C R Binder

Abstract The highest share of the global population lives in cities. The current configuration of the latter requires considerable amounts of resource flows causing the degradation of local and global ecosystems. To face the complexity of these challenges, scientists use the concept of urban metabolism (UM), i.e. measuring urban input and output flows from a systemic perspective. This accounting method results in a large data collection from multiple sources that are often not harmonised. Metabolism of Cities Data Hub is an online platform which facilitates data collection, processing and visualisation in order to extract urban metabolism insights. This work highlights the challenges faced when mining urban metabolism data in the case of Lausanne and Geneva, as well as provides insights on how data could be best used from users and providers. Slight differences between the two case studies, in terms of data accessibility and availability where experienced but the main challenges revolved around data copyright, format and availability. As a conclusion, the used tool can enable harmonisation and standardisation of UM data. As such it could contribute to the use of data mining to streamline the environmental monitoring of cities as well as facilitate the creation of mitigation strategies.


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