Social Aspects of Sustainability

This article presents results from the first statistically significant study of cost escalation in transportation infrastructure projects. Based on a sample of 258 transportation infrastructure projects worth US$90 billion and representing different project types, geographical regions, and historical periods, it is found with overwhelming statistical significance that the cost estimates used to decide whether such projects should be built are highly and systematically misleading. Underestimation cannot be explained by error and is best explained by strategic misrepresentation, that is, lying. The policy implications are clear: legislators, administrators, investors, media representatives, and members of the public who value honest numbers should not trust cost estimates and cost-benefit analyses produced by project promoters and their analysts.

This article presents results from the first statistically significant study of traffic forecasts in transportation infrastructure projects. The sample used is the largest of its kind, covering 210 projects in 14 nations worth U.S.$59 billion. The study shows with very high statistical significance that forecasters generally do a poor job of estimating the demand for transportation infrastructure projects. For 9 out of 10 rail projects, passenger forecasts are overestimated; the average overestimation is 106%. For half of all road projects, the difference between actual and forecasted traffic is more than ±20%. The result is substantial financial risks, which are typically ignored or downplayed by planners and decision makers to the detriment of social and economic welfare. Our data also show that forecasts have not become more accurate over the 30-year period studied, despite claims to the contrary by forecasters. The causes of inaccuracy in forecasts are different for rail and road projects, with political causes playing a larger role for rail than for road. The cure is transparency, accountability, and new forecasting methods. The challenge is to change the governance structures for forecasting and project development. Our article shows how planners may help achieve this.

The article first describes characteristics of major infrastructure projects. Second, it documents a much neglected topic in economics: that ex ante estimates of costs and benefits are often very different from actual ex post costs and benefits. For large infrastructure projects the consequences are cost overruns, benefit shortfalls, and the systematic underestimation of risks. Third, implications for cost–benefit analysis are described, including that such analysis is not to be trusted for major infrastructure projects. Fourth, the article uncovers the causes of this state of affairs in terms of perverse incentives that encourage promoters to underestimate costs and overestimate benefits in the business cases for their projects. But the projects that are made to look best on paper are the projects that amass the highest cost overruns and benefit shortfalls in reality. The article depicts this situation as ‘survival of the unfittest’. Fifth, the article sets out to explain how the problem may be solved, with a view to arriving at more efficient and more democratic projects, and avoiding the scandals that often accompany major infrastructure investments. Finally, the article identifies current trends in major infrastructure development. It is argued that a rapid increase in stimulus spending, combined with more investments in emerging economies, combined with more spending on information technology is catapulting infrastructure investment from the frying pan into the fire.

This paper focuses on problems and their causes and cures in policy and planning for large-infrastructure projects. First, it identifies as the main problem in major infrastructure developments pervasive misinformation about the costs, benefits, and risks involved. A consequence of misinformation is cost overruns, benefit shortfalls, and waste. Second, it explores the causes of misinformation and finds that political-economic explanations best account for the available evidence: planners and promoters deliberately misrepresent costs, benefits, and risks in order to increase the likelihood that it is their projects, and not those of their competition, that gain approval and funding. This results in the ‘survival of the unfittest’, in which often it is not the best projects that are built, but the most misrepresented ones. Finally, it presents measures for reforming policy and planning for large-infrastructure projects with a focus on better planning methods and changed governance structures, the latter being more important.

A major source of risk in project management is inaccurate forecasts of project costs, demand, and other impacts. The paper presents a promising new approach to mitigating such risk, based on theories of decision making under uncertainty which won the 2002 Nobel prize in economics. First, the paper documents inaccuracy and risk in project management. Second, it explains inaccuracy in terms of optimism bias and strategic misrepresentation. Third, the theoretical basis is presented for a promising new method called "reference class forecasting," which achieves accuracy by basing forecasts on actual performance in a reference class of comparable projects and thereby bypassing both optimism bias and strategic misrepresentation. Fourth, the paper presents the first instance of practical reference class forecasting, which concerns cost forecasts for large transportation infrastructure projects. Finally, potentials for and barriers to reference class forecasting are assessed.

"Over budget, over time, over and over again" appears to be an appropriate slogan for large, complex infrastructure projects. This article explains why cost, benefits, and time forecasts for such projects are systematically over-optimistic in the planning phase. The underlying reasons for forecasting errors are grouped into three categories: delusions or honest mistakes; deceptions or strategic manipulation of information or processes; or bad luck. Delusion and deception have each been addressed in the management literature before, but here they are jointly considered for the first time. They are specifically applied to infrastructure problems in a manner that allows both academics and practitioners to understand and implement the suggested corrective procedures. The article provides a framework for analyzing the relative explanatory power of delusion and deception. It also suggests a simplified framework for analyzing the complex principal-agent relationships that are involved in the approval and construction of large infrastructure projects, which can be used to improve forecasts. Finally, the article illustrates reference class forecasting, an outside view de-biasing technique that has proven successful in overcoming both delusion and deception in private and public investment decisions.

The circular economy (CE) has recently become a popular discourse especially in government and corporate sectors. Given the socio-ecological challenges of the Anthropocene, the concept of CE could indeed help the transition to a sustainable, just and resilient future. However, the actual definition, objectives and forms of implementation of the CE are still unclear, inconsistent, and contested. Different actors and sectors are thus articulating circular discourses which align with their interests, and which often do not sufficiently examine the ecological, social and political implications of circularity. In this context, this research asks how to better navigate and analyse the history, complexity and plurality of circularity discourses by conceptually differentiating them in a comprehensive discourse typology. To answer this question a critical literature review has been carried out, which first, examines and reflects on the core challenges, gaps and limitations of the CE concept. Second, this research develops a comprehensive timeline of circularity thinking, which identifies and conceptually classifies 72 different CE-related concepts from the Global North and South (such as Gandhian and steady-state economics, buen vivir, doughnut economics and degrowth). This leads to the development of a typology of circularity discourses, which classifies circularity visions according to their position on fundamental social, technological, political and ecological issues. This research thus seeks to provide a basis for a more inclusive and comprehensive discussion on the topic, which opens the imaginary regarding the many circular futures that can exist and allows for a cross-pollination of ideas, policy options, strategies, practices and solutions.

The Supplementary Green Book Guidance on Optimism Bias (HM Treasury 2003) with reference to the Review of Large Public Procurement in the UK (Mott MacDonald 2002) notes that there is a demonstrated, systematic, tendency for project appraisers to be overly optimistic and that to redress this tendency appraisers should make explicit, empirically based adjustments to the estimates of a project’s costs, benefits, and duration. HM Treasury recommends that these adjustments be based on data from past projects or similar projects elsewhere, and adjusted for the unique characteristics of the project in hand. In the absence of a more specific evidence base, HM Treasury has encouraged departments to collect data to inform future estimates of optimism, and in the meantime use the best available data. In response to this, the Department for Transport (henceforth DfT), has contracted Bent Flyvbjerg in association with COWI to undertake the consultancy assignment "Procedures for dealing with Optimism Bias in Transport Planning". The present Guidance Document is the result of this assignment.

Urban Sustainability in Theory and Practice responds to the crises of sustainability in the world today by going back to basics. It makes four major contributions to thinking about and acting upon cities. It provides a means of reflexivity learning about urban sustainability in the process of working practically for positive social development and projected change. It challenges the usually taken-for-granted nature of sustainability practices while providing tools for modifying those practices. It emphasizes the necessity of a holistic and integrated understanding of urban life. Finally it rewrites existing dominant understandings of the social whole such as the triple-bottom line approach that reduces environmental questions to externalities and social questions to background issues. The book is a much-needed practical and conceptual guide for rethinking urban engagement.

2008. 352 pp. r150.00 (hardcover). This volume is intended to explain why major investment projects (the so-called mega-projects) often are not completed on time and cost more than originally budgeted. Drawing from experiences of European and North American countries, the book also suggests ways to avoid such failures. Although the topic is rather specific, the book is worth reading for both experts and nonexperts as infrastructure development continues to be a major key to economic expansion across the globe.g row_486 380.. 408 For those who only have a vague idea of what a mega-project is, the book begins by introducing the topic and reviewing the most important recent literature. The first part of the volume, then, provides numerous insights on the complexity of mega-projects, starting from the large number of reasons why mega-projects might fail. For example, the project might be "underdesigned," thus less costly but less robust to unforeseen developments, or it might be "overdesigned," when a large number of weaknesses and possible problems are considered in advance, and solutions are evaluated before the problem actually occurs. Overdesigned projects are more robust, less likely to fail, but are much more costly. The project might involve the use of innovative technologies that have never been applied to a similar context, and that involve more uncertain implementation costs and results. Most projects have an impact on the environment and might face opposition for example from environmentalist groups. If representative of these groups have not been directly involved in the design of the project, they might try to stop it, thus causing delays and increasing costs. Finally, because of incorrect predictions of 380 GROWTH AND CHANGE, JUNE 2009

Risk, including economic risk, is increasingly a concern for public policy and management. The possibility of dealing effectively with risk is hampered, however, by lack of a sound empirical basis for risk assessment and management. This article demonstrates the general point for cost and demand risks in urban rail projects. The article presents empirical evidence that allow valid economic risk assessment and management of urban rail projects, including benchmarking of individual or groups of projects. Benchmarking of the Copenhagen Metro is presented as a case in point. The approach developed is proposed as a model for other types of policies and projects in order to improve economic and financial risk assessment and management in policy and planning.

This paper explores how theories of the planning fallacy and the outside view may be used to conduct quality control and due diligence in project management. First, a much-neglected issue in project management is identified, namely that the front-end estimates of costs and benefits – used in the business cases, cost-benefit analyses, and social and environmental impact assessments that typically support decisions on projects – are typically significantly different from actual ex post costs and benefits, and are therefore poor predictors of the actual value and viability of projects. Second, it is discussed how Kahneman and Tversky’s theories of the planning fallacy and the outside view may help explain and remedy this situation through quality control of decisions. Third, it is described what quality control and due diligence are in the context of project management, and an eight-step procedure is outlined for due diligence based on the outside view. Fourth, the procedure is tested on a real-life, multibillion-dollar project, organized as a public-private partnership. Finally, Akerlof and Shiller’s recent discussion in economics of “firing the forecaster” is discussed together with its relevance to project management. In sum, the paper demonstrates the need, the theoretical basis, a practical methodology, and a real-life example for how to de-bias project management using quality control and due diligence based on the outside view.

Economic, environmental and social aspects of sustainability have been shown to span beyond organizational boundaries, indicating the importance of managing sustainability initiatives across the supply chain. Although scholars and practitioners focus a great deal of attention toward economic and environmental sustainability in supply chains, less attention is paid to social aspects. This is unfortunate, because social sustainability not only plays an important role in enabling other sustainability initiatives, but social injustices in one echelon of a supply chain can lead to significant losses for firms across the chain. Social issues have been especially problematic in developing nations, where abusive labor practices continue to negatively affect trading partners. This research seeks to disambiguate supply chain social sustainability in developing nations by uncovering relevant dimensions of social sustainability and resultant outcomes. Using semi-structured interview data collected from supply chain executives in Indian manufacturing companies, this research uncovers dimensions of social sustainability in terms of not only the focal firm, but also first-tier suppliers and customers. Each of these dimensions is then associated to potential performance outcomes. The findings not only provide a baseline for future research, but help practitioners understand where to focus their attention to enhance social sustainability in their supply chains.

Do different types of megaprojects have different cost overruns? This apparently simple question is at the heart of research at the University of Oxford aimed at understanding the characteristics of megaprojects, particularly in terms of how they are established, run and concluded. In this study, we set out to investigate cost overruns in the Olympic Games. To do so, we examined the costs of the Games over half a century, including both summer and winter Olympics. We looked at the evolution of final reported costs and compared these to the costs established in the Games bids, submitted to the International Olympic Committee (IOC) up to seven years before the Games occurred. In so doing we established the largest dataset of its kind, and documented for the first time in a consistent fashion the costs and cost overruns for the Olympic Games, from 1960 to 2012. We discovered that the Games stand out in two distinct ways compared to other megaprojects: (1) The Games overrun with 100 per cent consistency. No other type of megaproject is this consistent regarding cost overrun. Other project types are typically on budget from time to time, but not the Olympics. (2) With an average cost overrun in real terms of 179 per cent – and 324 per cent in nominal terms – overruns in the Games have historically been significantly larger than for other types of megaprojects, including infrastructure, construction, ICT, and dams. The data thus show that for a city and nation to decide to host the Olympic Games is to take on one of the most financially risky type of megaproject that exists, something that many cities and nations have learned to their peril. For the London 2012 Games, we find that: (1) With sports-related real costs currently estimated at USD14.8 billion, London is on track to become the most costly Olympics ever. (2) With a projected cost overrun of 101 per cent in real terms, overrun for London is below the historical average for the Games, but not significantly so. (3) The London cost overrun is, however, significantly higher than overruns for recent Games since 1999. London therefore is reversing a positive trend of falling cost overruns for the Games.

Utilizing 14 semi-structured interviews in a non-western context, this exploratory study examines how Filipino migrant workers' leisure satisfaction and QoL are intertwined in Macao, China. The study reveals that Filipino migrant workers regard "family and friends", and a sense of community as central to their QoL. Regarding leisure, the Filipino migrant workers experienced a lack of time-off and long working hours (structural leisure constraints) whilst living without their families in the Philippines (interpersonal leisure constraints). In addition, the Filipino migrant workers noted that few leisure options were available to them, and given commercial options dominate in Macao, the perceived cost of leisure participation clashes with the Filipino migrant workers responsibility to send remittances home. It is recommended that authorities and employers explore the importance of subjective QoL indicators such as sense of community that emerge from marginalized social groups, such as migrant workers, into their measurement systems and policy deliberations, to create a livable and sustainable community for all. Our study enriches the extant research by broadening the research location to focus on "voices" from low income migrants in a non-western context.

Some U.S. local governments are leveraging public procurement to meet their sustainability goals. However, does the simultaneous pursuit of multiple sustainability objectives potentially slow down the speed of procurement processes? We suggest that the simultaneous pursuit of multiple sustainability objectives through procurement is related to decision making speed. Additionally, we argue that centralized decision-making structures might moderate this relationship. Drawing on a representative sample of more than 200 U.S. local governments, we demonstrate that for low-cost purchases, as the number of policy objectives increases, so too does the average length of time for approval. We also find evidence of an interactive relationship between decision-making structures and the number of existing sustainability policies pursued simultaneously. For routine low-cost and routine high-cost purchases, we find evidence that as the centralization of procurement decision making increases, the marginal effect of purchasing complexity on approval times decreases. These findings offer important evidence about how pursuing multiple sustainability objectives affect decision-making efficiency and how decision-making structures might facilitate U.S local governments' integration of sustainability objectives into their existing internal processes.

The increasing concern over tourism's greenhouse gas emissions (GHG) and its subsequent impact on climate change has led some to recommend strict measures to reduce the volume of travel. While the reduction of tourism's GHG emissions is an essential piece of tourism's sustainability, there has been little discussion of the implications that reducing travel could have on a destination's triple bottom line (ecological, sociocultural, and economic sustainability). Much of the sustainable tourism literature has historically focused on maximizing tourism's benefits to residents' quality of life, the environment, cultural heritage, and the economy, but these traditional metrics have been largely removed from the recent discussion on tourism and climate change. This article proposes a conceptual model that incorporates the traditional metrics of sustainability with the net amount of GHG emitted to help determine whether travel has a net positive or negative impact. While the model is entirely theoretical, it depicts sustainable tourism as not solely a function of GHG emissions, but a function of maximizing tourism's positive impacts (handprint) within destinations while minimizing its GHG emissions (footprint). The article concludes by demonstrating how the framework can be applied to increase tourism's sustainability within destinations as well as globally.

We have discussed previously that a community led, asset based approach is required to achieve any sense of how social sustainability can be defined in a community setting within the context of energy developments. Our approach aims to initiate a lasting change within ‘energy’ communities through building social capital; focusing on community assets not deficits to define their social priorities. Through deliberation, we develop an understanding of social sustainability so that a community is well placed to enter discussions with government and industry regarding large energy developments that will directly affect them.
We review the 2015 Generic Design Assessment (GDA) Public Dialogue Pilot process for potential new nuclear reactors in the UK. We examine the aims of the dialogue, giving particular attention to a comparison between the national sampling of citizens for the GDA and the local community, deliberative approach we have proposed previously. We find an ongoing tension between ‘national’ engagement processes (such as the GDA Public Dialogue Pilot process) and the specific requirements of those energy communities that live adjacent or close to energy infrastructure, manifested here by a conflict between the requirements of the convenor and those of participants regarding priority issues for discussion. We also reveal a paradox; despite participant preference for a remote, internet-based engagement process, they agreed that face to face contact is a priority to encourage trust building between participants and the convenor of the process – a desired outcome of the process.
The GDA Public Dialogue Pilot process has demonstrated that stakeholders are willing to engage with and be more directly involved in local energy-related decisions that affect them directly, provided there is opportunity to discuss locally-relevant and site-specific issues in addition to those of a broader nature. There exists a disparity and conflict between ‘national’ engagement processes and the ‘local’ priorities of those energy communities that are adjacent or close to energy infrastructure. In this process and others, we have seen an imbalance between the requirements of the convenor and those of participants regarding priority issues for discussion. This continues to be a persistent challenge for those convening stakeholder engagement events where the scope and context is not primarily site-specific. However, it is encouraging that convenors and participants alike continue to be willing to work towards resolving this.

Building on farmer’s agroecological knowledge to design environmental-friendly agricultural systems is crucial given the environmental impact of industrial agriculture. We investigated the drivers of farmers’ knowledge of agrobiodiversity management and analyzed how farmers’ knowledge and their current farming contexts may guide future farming systems in sub-humid (Bassila) and semi-arid (Boukoumbé) areas of Benin. We conducted structured interviews with 180 farmers and used generalized linear models and correlation analyses to understand the spatio-temporal dynamics of farmers’ knowledge and perception. Land tenure, ecological conditions and sociolinguistic membership were the main drivers of farmers’ knowledge of agroforestry systems, practices, species diversity and current farming systems. Sociolinguistic membership also significantly predicted farmers’ knowledge of livestock management. Farmers in the semi-arid area were more involved in integrated crop-tree-livestock systems than those in the sub-humid area. However, all farmers indicated a willingness to adopt this integrated farming system regardless of socioeconomic and ecological factors. Farmer’s knowledge of agrobiodiversity (crops, agroforestry species and livestock diversity) management was correlated with the involvement in integrated crop-livestock-tree and agroforestry systems. These findings provide insights into how farmers’ knowledge can serve as basis in optimizing agricultural and livelihoods systems. Investigating the ecological, economic and social performance of the most desired integration/diversification options using a system approach involving a co-innovation process can further our mechanistic understanding of farmers decision making process.

Over the coming two decades Asia will be the main driver of a 40% increase in global energy consumption. Ambitions for a more sustainable future in the region are severely compromised by the widespread and rapid take-up of energy-intensive methods for cooling the built environment. For the majority of Asia’s countries buildings account for more than 50% of all national greenhouse gas emissions. With around half that energy consumption typically associated with cooling or heating interior spaces, national carbon footprints have increased dramatically in recent decades through the introduction of electronic airconditioning.
This paper argues such trends are unsustainable and low-carbon alternatives for environmental comfort are required urgently. It traces shifts in how air has been ‘materially imagined’ over the last century or so in Asia and how this bears upon the future of sustainable urbanism. Air-conditioning is seen as pivotal to transformations in urban design and living, such that two phases of modernity are identified: preconditioned and conditioned. By foregrounding the need for low-carbon alternatives, the paper advocates for an alternative, low-carbon regime of thermal governance.

In reflecting on Dutch Christmas shoppers, this article will discuss Environmental Kuznets Curve (EKC), postmaterialist values hypothesis, and ecological modernization theory. According to the EKC hypothesis, while at the initial stages of industrialization material resources are often used unsustainably, continuing industrialization leads to a threshold after which lead to progressively more sustainable technologies. According to the postmaterialist values hypothesis, only wealthier societies can ‘afford’ to care about the environment, assuming that wealth will lead to development of greater concern about and valuation of environment. Finally, ecological modernization theory postulates that environmental conditions improve with advanced technological development and suggests that enlightened self-interest, economy and ecology can be favorably combined and that productive use of natural resources can be a source of future growth. In generalizing economic, political and social trends in relation to consumption in The Netherlands, the aim of this article is to consider the consequences of Western-style consumption for the enterprise of global development.

Abstract: This paper examines two issues related to research of certified fair trade goods. The first is the question of how agendas for fair trade research should be developed. The second issue is the existence of major gaps in the fair trade literature, including the study of the particular features of fair trade practice in individual northern countries. In taking up the first of these issues, the paper proposes that normative analysis should provide the basis for developing research agendas. Such an approach is important to ensure that the necessary types of questions to make normative judgments and policy decisions are posed and that biases that tend to favor mainstreaming practices in the generation of knowledge are minimized. The paper addresses the second research issue by examining the development of research agendas at the level of individual countries, using Canada as a case.

Someone said that writing a PhD thesis is a lonely process. It is, and I sometimes felt like it was especially so for me. Therefore, I bear the sole responsibility for the mistakes, the inconsistencies, the confusion and the few good ideas that are found in the next 400 something pages. However, a few good people have helped along the way, and I much obliged to them.

Mining and quarrying activities in Europe generate approximately 55% of total industrial wastes, according to a recent Eurostat report. Most of these wastes are directly dumped on land or deposited in landfill sites. The first solution may lead to negative environmental impacts on land (removal of vegetation, deforestation, land slope changes and increased risk of erosion), water (pollutant transport through surface runoff, soil infiltration and contamination of water resources), may lead to the contamination of agricultural goods and may impose risks on human health. In Portugal, about 20% of industrial waste produced originates from mines and quarries, particularly from Panasqueira mining, one of the largest tungsten mines in the world. Currently, Panasqueira mining generates almost 100 tonnes of waste-rock, per day. Such waste-rock have accumulated over a number of years into very large heaps and it is desirable to seek new economic solutions that can contribute towards their reuse. In this context, this work discusses the potential for reuse of waste-rock piles of Panasqueira tungsten mine, which may be a case statement to be followed. The proposed solution described in this paper consists in developing innovative polymer-based composite materials, obtained from non-contaminated waste-rock tailings. Such materials must have suitable properties for technical-artistic value added applications, such as conservation, restoration and/or rehabilitation of historic monuments, sculptures, decorative and architectural intervention, or simply as materials for building revetments.

This study investigated the effects of reed and willow on bioremediation of landfill leachate in comparison with an unplanted control by measuring redox potential levels in the rhizosphere of microcosm systems in a greenhouse. Plants had a significant influence on redox potential relative to the plant-less system. Redox potential in the reed rhizosphere was anoxic (mean −102 ± 85 mV), but it was the least negative, being significantly higher than in the willow (mean −286 ± 118 mV), which had the lowest Eh. Redox potential fluctuated significantly in the willow rhizosphere during daylight hours, with large decreases in the morning. Levels of NH4+ decreased significantly in the first day of the experiment and remained at similar low levels in all three variants for the next four weeks of the experiment. Following this removal of ammonia significant peaks in NO2− occurred in the control and reed tanks on the 1st day, and again on 14th day in the control tank up to 13 mg/dm3. In the willow tank there was also one significant peak of NO2− in the first week, but only up to 0.5 mg/dm3. Significant accumulation, within 21 days of NO3− in all variants was observed, but in tanks with reed and willow the concentration of NO3− remained significantly lower (<4 mg/dm3) than in the unplanted tank (∼35 mg/dm3). Final levels of total-nitrogen, nitrate and chemical oxygen demand were considerably lower in the reed and willow tank than in the unplanted tank.

Companies responsible for product development (PD) and manufacturing play an important role in supporting society in achieving sustainability, and yet they do not always include full sustainability considerations in PD decisions. The social dimension of sustainability has been largely neglected in the PD field and there is very little empirical evidence of social sustainability implementation in general. The aim of this paper is to investigate how social sustainability is currently included in PD organizations and what their motivations are to do so. Results from a comparative case study approach with three organizations include rich descriptions across four dimensions: The scope of the work and their view of interdependencies with other social systems, their definition of social sustainability and the issues they work with, what guides strategic decisions, and how this internal work is structured. The results reveal that the three product development organizations are heterogenous in their approaches to social sustainability and that the more advanced approach shows a better understanding of the complexity of social sustainability and a broader perspective of its interdependencies, which goes hand-in-hand with a way of organizing that overcomes traditional hierarchies and allows for more collaborative and strategic work in this area. This systems perspective also drives what issues are included in an organization's work; scope and definition of social sustainability become more encompassing and aligned. Finally, our study shows that social sustainability impacts connected to products' lifecycles, when addressed, are done so by functions outside design activities, as opposed to product developers. A greater understanding of how companies currently approach social sustainability and what challenges they might face in integrating it in organizational and design related practices has been called for; our paper contributes to this but acknowledges that more work is needed.

Three discontinuous batch shallow constructed wetland systems with recirculating subsurface horizontal flow with reed, willow, and without plants were used to assess the removal of nitrogen from landfill leachate in relation to hydraulic retention time and climatic conditions. In all systems redox potential in the beds increased asymptotically from negative anoxic conditions to +67 (reed bed), −2 (willow bed), and +17 mV (control bed), reaching a plateau in two wk. During the first 24 h after feeding the beds all forms of nitrogen decreased significantly. It has been shown that plants release O2 and Norg which was then hydrolyzed to ammonia. Plant-available radiation significantly (p < 0.05) increased the release of Norg and removal of ammonia after the 9th day of the experiment. Low, and relatively constant concentrations of nitrite and nitrate indicated that denitrification had taken place in the beds.

Among the most pressing energy and environmental strategic challenges today is to identify and deploy viable alternatives to fossil-fuel-based energy systems  The barriers to deployment are systematic, leading to a state of affairs described as ‘carbon lock-in’ (Unruh
2000; Neuhoff 2007). Simply stated, even if alternative energy systems are cost-competitive in theory, the prime movers that control their diffusion throughout society –
for example, conversion and distribution infrastructure; financing mechanisms; skilled labour force; attitudes toward particular kinds of energy production activities and energy services – exhibit a preference for incumbent carbon-intensive fossil energy resources. Carbon lock-in represents path dependencies within energy systems including sunk-cost in prevailing infrastructure and entrenched political interests along with positively reinforcing relationships with broader system dynamics, from global financial logics that continue to monetise unburned carbon through energy
futures contracts to our everyday practices and expectations about mobility, comfort, and overall
well-being that underpin regular visits to the gasoline station. All of this is to say that energy systems are sociotechnical in nature, characterised by deep and often subtle interdependencies between technological, social, political-economic, and cultural processes which operate across the energy supply chain and at all scales of energy system operation (Miller, Richter, and O’Leary 2015).

The integration of technology into education has forced radical innovations to traditional instructional delivery models. Given its prevalence, a thorough understanding of peda-gogical best practices associated with the design and implementation of such programs is critical. Furthermore, the need for an institutional commitment to assessment and a framework to objectively measure student performance against a program's learning goals and objectives is also necessary. The impetus behind this study is to suggest that applying the principles of continuous improvement (CI) to pedagogical assessments can foster institutional commitment and enhance the process by which universities assess student performance. This study applies CI to an Assurance of Learning assessment of two courses in an entirely online supply chain management program by implementing DMAIC as a tool to improve program-level outcomes. The results show how the course content and program can be continuously improved to enhance student learning and the related outcome measures.

A submerged biologicalaeratedfilter (BAF) partiallyaerated was used to study the removal of lowconcentrations of ammonia nitrogen (0.3 g N/m3 to 30.5 g N/m3) typically found in nutrient enriched river and lake waters, and treated effluents. Four series of experiments were performed with a synthetic wastewater at ammonia loading rates between 6 g N/m3 d and 903 g N/m3 d and C/N ratios from 2 to 20. The results showed that ammonia removal rates reached higher values (172 g N/m3 d to 564 g N/m3 d) for C/N = 2 and lower values (13.6 g N/m3 d to 34.6 g N/m3 d) for C/N = 20. Between 50% and 70% of the ammonia was removed in the upper section of the BAF, where the dissolved oxygen (DO) concentration was over 2.1 g O2/m3 and the biofilm depth ranged from 0.4 to 0.6 mm. At the bottom section of the reactor, simultaneous removal of ammonia and nitrate was observed at the DO concentrations in the range 0.4 g O2/m3 to 0.8 g O2/m3. There was no removal of ammonia nitrogen for loads below 15 g N/m3.d. The results indicate that the removal of nitrogen in partiallyaerated BAF may not only be explained by the conventional mechanisms of nitrification/denitrification.

This research explores the attitudes of children from different socioeconomic backgrounds toward consumption with the aim of establishing a framework for incorporating the subject of (responsible) consumption into the upper elementary school curriculum. This study draws upon the four-step methodological procedure, including consumption diaries, focus-group sessions, interviews, and concept mapping, conducted among 140 upper elementary school children in the Netherlands between September 2010 and January 2011. The consumption diaries, chronological documents recording purchase, use and waste of materials, were used both as analytical tools and the means to stimulate environmental awareness. Comparison of the clusters generated by concept mapping analysis shows that there are significant differences between attitudes of children from different socioeconomic backgrounds. While pupils from the “well-to-do” predominantly ethnically Dutch schools showed greater awareness of and concern about their own consumptive patterns, children from less economically advantaged and ethnically mixed schools demonstrated lower environmental awareness and concern. However, children from the disadvantaged schools demonstrated more pro-environmental consumptive behaviors associated with the money-saving activities.

Climate change means that countries like Canada need to find suitable transition pathways to overcome fossil-fuel dependence; one such pathway is the so-called 'bio-economy'. The bio-economy is a term used to define an economic system in which biological resources (e.g., plants) form the basis of production and production processes. For example, it would involve the replacement of petroleum energy, inputs, chemicals, and products with bioenergy, biological inputs, bio-chemicals, and bio-products. A number of countries and jurisdictions have established policy strategies in order to promote and support the development of a bio-economy, exemplified by the European Union where the bio-economy represents a key pillar in its broader Horizon 2020 strategy. Other countries, like Canada, do not yet have an over-arching bio-economy strategy, but have a series of diverse, and often competing, policy visions and frameworks. It is useful to analyse countries like Canada in order to understand how these policy visions and policy frameworks are co-constituted, and what this might mean for the development of an over-arching bio-economy strategy. This raises a number of questions: How is the bio-economy imagined by different social actors? How are these imaginaries and policy frameworks co-produced?

Infrastructure threatens to lock-in societies to fossil fuels, unless something is done about it now. This is because infrastructure lasts for such a long-time, meaning that any infrastructure built or rebuilt now will last well into the 21st century – even until the end of the century in some cases. Consequently, there is a need to integrate climate change, especially adaptation, into infrastructure now or societies will be left with infrastructure designed around an unsustainable socio-technical system (e.g. combustion engines, roads, suburbanization, etc.). Such change is conceptualized in the literature as a sustainability transition. However, any attempts at such transitions have to address the materialities of infrastructure systems (e.g. physical form, environmental context, etc.). In this paper I develop the concept of socio-material systems and apply it to transport infrastructure in Ontario, Canada.

Excessive growth of biomass and retention of solids associated with air bubbles lead to bed clogging, which affects the biofilters’ performance. Two experiments were carried out in a submerged biofilter at the flow velocity of 0.5 m h−1, for an organic loading rate of 51 g C m−3 h−1 and a nitrogen loading rate of 13 g NH4-N m−3 h−1, one with the biofilter not aerated, the other with the biofilter partially aerated. The results showed that the higher head losses occurred in the upper section of the biofilter, where there was a greater biomass development and a higher removal of organic carbon, ammonia and solids, with the maximum allowed head loss being reached in 16 and 8 days. In any case, the steady-state conditions were achieved after 2 days and were interrupted on the tenth day of experiment E1 and on the fifth day of experiment E2. This allowed defining different operating cycles that enabled an average organic removal rate of 12.7 g C m−3 h−1 (27 %) and an average ammonia removal rate of 1.1 g NH4-N m−3 h−1 (9 %) without aeration, and of 35.8 g C m−3 h−1 (76 %) and 6.3 g NH4-N m−3 h−1 (51 %) with aeration. Regardless of the aeration conditions, more than 90 % of TOC and NH4-N removal occurred in the upper section. After the backwashing cycle, the biofilter returned to steady-state conditions in 6 h (without aeration) and 7 h (with aeration).

A monitoring campaign in a horizontal subsurface flow constructed wetland under the influence of transient loads of flow-rate, organic matter, nitrogen and suspended solids showed an irregular removal of COD and TSS and lower both removal efficiencies and mass removal rates than the ones observed in other studies for similar operating conditions. This circumstance is associated to the presence of large amount of particulate organic matter from non-point sources. The mass removal rate of ammonia increased 39% as both the water and soil temperatures increased from weeks 1–8 to weeks 9–14. A good correlation between mass load and mass removal rate was observed for all measured parameters, which attests a satisfactory response of the bed under to transient loads.

Taking as reference the historical context of the expansion phenomenon of Medellin and the anthropogenic processes based on
Moravia´s neighborhood, this paper purpose is to make an impact evaluation of the Integral Improvement Plan (PPMIM 2004-
2011), using the relationship between the urban design features and the social capital variables. Initially, a theoretical and
conceptual framework of the various topics under review is presented. Secondly, we confront the PPMIM´s principles, its urban
design strategies, its procedural methodology with the built project and evaluate its general socio spatial impact. Finally, we
analyze its impact on the cognitive and structural dimensions of the social capital. The Integral Improvement Plan (PPMIM)
brought the physical, ecological, cultural and social rehabilitation of the human settlement allowing recovering the historical as
well as the cultural memory of the community and strengthening some aspects of the social capital and its ties, as the bridging
and linking networks. Finally the paper highlights and summarizes positive and negative implications of slum upgrading
programs and some necessary recommendations for urban design, the social capital that can really be translated into real
resources for the self-sustainable development of low-income communities and their future generations.

The concept of "Affordance" is increasingly used among urban designers because it adds theoretical clarity to the understanding of the link between the environment, human behavior, and human needs fulfillment. Affordances emerge only when the different characteristics of individuals, such as their physical dimension and abilities, social needs and personal intentions are matched with the features of the environment. However, in formalizing social sustainability, a central issue to be addressed is the relationship between people and their environment in social sustainability processes. The definition of "Affordance " of a particular urban context will provide the means to make precise the opportunities for achieving social sustainability. With reviewing the related literature, it is concluded that the multidisciplinary relations between "Human Needs " and "Social Sustainability" with the aim of "Theory of Affordance" has been out of scholar's agenda. This paper fills this gap with proposing an integrated model of fulfilling human needs in the urban context through achieving social Sustainability with the aim of cognitive affordance.

This paper illustrates the potential federal financial risk created by groundwater over-abstraction, rapid urbanization, competing economic interests and institutional arrangements in groundwater-dependent areas of Texas. In the Upper Trinity Groundwater Conservation District (UTGCD), located in the Dallas-Fort Worth Metropolitan Area, urban sprawl creates suburbanized rural areas reliant upon the Upper Trinity Aquifer. Within the past 10 years, competing economic interests for groundwater have intensified as the area has experienced rapid urban sprawl combined with escalating Barnett Shale hydraulic fracturing activity, which coincided with two extreme droughts in 2006 and 2011. Urban sprawl generates business opportunities and tax revenues for state and local governments in the short term, but if groundwater-overabstraction leads to land subsidence, financial risk is transferred to the federal government due to increased risk exposure from federal housing loans and government-backed residential lending.

Most of the wastewater treatment systems in small rural communities of the Cova da Beira region (Portugal) consist of constructed wetlands (CW) with horizontal subsurface flow (HSSF). It is believed that those systems allow the compliance of discharge standards as well as the production of final effluents with suitability for reuse. Results obtained in a nine-month campaign in an HSSF bed pointed out that COD and TSS removal were lower than expected. A discrete sampling also showed that removal of TC, FC and HE was not enough to fulfill international irrigation goals. However, the bed had a very good response to variation of incoming nitrogen loads presenting high removal of nitrogen forms. A good correlation between mass load and mass removal rate was observed for BOD5, COD, TN, NH4-N, TP and TSS, which shows a satisfactory response of the bed to the variable incoming loads. The entrance of excessive loads of organic matter and solids contributed for the decrease of the effective volume for pollutant uptake and therefore, may have negatively influenced the treatment capability. Primary treatment should be improved in order to decrease the variation of incoming organic and solid loads and to improve the removal of COD, solids and pathogenic. The final effluent presented good physical–chemical quality to be reused for irrigation, which is the most likely application in the area.

Preprint of a peer-reviewed article, accepted for publication at the journal Quaestiones Geographicae

The article presents results from a research on the relevance and challenges of collaboration for the long-term sustainability of rural community enterprises. The study relies on Communities of Practice and Degrowth theories. Methods include semi-standardised interviews and focused ethnography in two community enterprises in rural areas in Germany and Portugal. Main results confirm the relevance of collaborative relations with residents, public sector, peer organisations and within the teams for both stability and transformative power of the organisations’ work. Respectful handling of privileges and balance in participation and professionalisation support sustainability, whereas institutional stagnation and involuntary degrowth may risk it.

This theoretical article opens with the reconstruction of a value-critical argument which claims that capitalism is a form of society that is structurally unsustainable. The reason for this is the need for ever-increasing value production which stems from the core of capitalism (the commodity form, competition, profit maximization, private production) and its internal and external limits. Based on this, the article calls for a fundamental social transformation and positions
the commons as a social form that has the potential to replace the
commodity form as societal foundation. Constituted by social practices
(commoning) that are based on voluntariness, autonomy and needs-
satisfaction, commons do not have an inbuilt growth compulsion. Therefore, the article concludes, the commons may enable humanity to deal with the question of sustainability on the basis of social structures that include the possibility of a solution.

The evaluation of the dispersion in vegetated beds may allow indentifying mechanisms that affect the transport and reaction of solutes, namely organic and nitrogen compounds. A set of non-reactive tracer experiments (slag injection) was performed in a vegetated bed (a mesocosm with a LECA-based substratum and colonized with Phragmites australis) used for the removal of organic and nitrogen pollutant loads. Loads of approximately 300 mg COD/L and 30 mg NH4-N/L and a hydraulic loading rate of 3.5 cm/d were used. The results showed a delay in all the residence time distribution (RTD) curves and a variation in the dimensionless residence time (μ(m,θ)) of the E(θ) curves, which means that the mass centre of the impulse was late relatively to the expected one. A strong dispersion and tracer retention (due to the presence of stagnated areas and internal recirculation) was observed, especially in the first 33 cm of the bed, which seems to have been related to the presence of complex clusters of roots, solid material, biofilm and LECA particles. An analytical solution of the Multiple-Tanks-in-Series (MTS) model well represents the RTD curves obtained in the tracer experiments. The detected dispersion and dead volume ratios (7% to 12%) did not affect the performance of the bed, which presented mean removal efficiencies of 85% and 60.4% for COD and NH4-N, respectively.

The multimode resource-constrained project scheduling problem (MRCPSP) deals with the scheduling of a set of projects with alternative requirements of renewable and non-renewable resources. Solutions to the MRCPSP usually consider objectives in terms of cost and time. However, social objectives related with the workforce may impact the performance of projects and affect program sustainability goals. To account for this new social input, this paper extends the MRCPSP and proposes a new multiobjective mixed-integer programming model. The proposed solution method uses an a priori lexicographic ordering of the objectives, followed by an e-constraints approach. The model is illustrated with a case study of a construction program.

This study was on the technical and biological characteristics of a partial-SHARON submerged-filter bioreactor of 3 L. The main focus was the influence of the hydraulic retention time (HRT) on biofilms. For this purpose, we used molecular tools based on the partial 16S rRNA genes. The results showed that the HRT may affect the nitrification processes of a bioreactor using synthetic
wastewater containing 600 mg/L of ammonia. It was found
that an HRT of 0.5 day transformed 100 % of the ammonium
into nitrite. However, when the HRT was decreased to 0.4 day, there was a significant reduction (35 %) in the quantity of ammonia transformed, which confirmed the complexity of the system operation. Moreover, a PCRTGGE approach highlighted the differences observed. The results obtained showed that an HRT of 0.5 day reduced bacterial biodiversity in the biofilms, which were mainly formed by Nitrosomonas and Diaphorobacter. In contrast, an HRT of 0.4 day facilitated the formation of heterogeneous biofilms formed by nitrifying bacteria, such as Nitrosomonas sp., Nitrosospira sp., and Nitrosovibrio sp.).

Pulp mill sludge produced in the Cova da Beira region (Portugal) contains organic matter (11–47%), nitrogen (38–2560mg N/kg) and phosphorus (167–370mg P/kg), which may be valuable for increasing soil productivity. The levels of heavy metals are below the limits recommended by legislation and the
amount of nitrogen and phosphorous to be introduced in soils does not present a risk for nutrient leaching.
After identifying the environmental and technical restrictions on its application, an area of 1650 ha was identified where the sludge can be applied in forage crops, fruit trees, olive groves and vineyards. A suitable area was also found for a biosolids storage centre. The use of GIS allowed to define a sludge
application index and to produce land-use suitability maps, which can be useful for sludge management.

At Teachers College, Columbia University, the Games Research Lab has created Greenify, an online social platform designed to foster flourishing sustainable communities. Gamification elements facilitated the creation and completion of user-generated missions, encouraging interaction between geographically proximate communities of peers. Three elements were identified as necessary components to achieve sustainable communities: a healthy climate and environment, social well-being, and economic security. This paper describes our approach in addressing these elements through a crowdsourced, gamified system. Implications for HCI are also discussed.