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Addressing global warming challenge, carbon emissions reduction potential of the construction industry has received additional attentions. The decoupling of construction industry and carbon emissions through policies, technologies and model innovations is an effective way for reducing environmental pollution and achieve eco-urban target. The paper aims to discuss these issues.

Within the scope of green building carbon emissions (GB-CO₂) research, a large number of scientific literature has been published in construction discipline over the past few decades. However, it seems that a systematic summary of strategies, techniques, models and scientific discussion of future direction of GB-CO₂ is lacking. Therefore, this paper carries out data mining on authoritative journals, identified the key research topics, active research areas and further research trends through visualization studies.

This study contributes to the body of knowledge in GB-CO₂ by critically reviewing and summarizing: professional high-quality journals have a greater influence in the scope of research, developed countries and developing countries are all very concerned about sustainable buildings, and the current hot topics of research focus on the application of the life cycle models, energy efficiency, environmental performance of concrete material, etc. Moreover, further research areas that could expand the knowledge of cross-national long-term carbon mechanisms, develop comprehensive life cycle carbon emissions assessment models, build technical standards and tests for the sustainable building material and systems, and exploit multi-objective decision models considering decarbonizing design and renewable energy.

This study is of value in systematic insight the state-of-the-art of GB-CO₂ research in the more recent decade. A more vividly and effectively method is documented in extending the traditional bibliometric review to a deeper discussion. This study can also benefit construction practitioners by providing them a focused perspective of strategy and technologies innovations for emerging practices in green building projects.

Dams require high-volume of construction materials and operations over the life cycle. This paper aims to select a proper type of dam structure that can significantly contribute to the sustainability of dam projects.

This research proposes a complementary fuel consumption and carbon dioxide (CO₂) emission assessment method for the alternate dam structure types to assist decision-makers in selecting sustainable choices. Related equations are developed for two common earthen and rock-fill dam structures types in Iran. These equations are then successfully applied to two real dam project cases where the significance of the achieved results are assessed and discussed.

The achieved results of the case studies demonstrate a high deviation of up to 41.3% in CO₂ emissions comparing alternate dam structure scenarios of earthen and rock-fill dam structures. This high deviation represents an important potential for CO₂ emission reduction considering the high volume of the emission in large dam projects.

The life cycle emission assessment of the alternate dam structures, proposed in this research as a novel complementary factor, can be used in the decision-making process of dam projects. The results in this research identify high potential sustainability improvement of dam projects as a result of the proposed method.

This study aims to use life cycle assessment to determine the environmental impact of food purchases at a small, liberal arts college. The authors also use the results to develop a simple decision-making tool for college and university dining services administrators, attempting to make their food purchases more sustainable.

Life cycle assessment was used to analyze the global warming potential (GWP) of all food products purchased at a college café during a four-month study period.

The authors found the top ten highest impact products accounted for 40% of orders by weight, but 80% of the GWP. In particular, beef and cheese exhibited the highest GWP/kg. These findings highlight the importance of considering the carbon intensity of food products when making purchasing decisions. The authors also examined the carbon intensity and cost of common meal options and developed a carbon intensity comparison heuristic that can assist in making food purchasing decisions with the goal of lowering the GWP of food purchases.

The results of this study show that life cycle assessment is a useful tool for university food service operations seeking to reduce environmental impact. The carbon intensity food comparison heuristic based upon this data serves as a helpful decision-making tool in guiding food service to reduce GWP.

While life cycle assessment has typically been used to analyze individual food products, this study demonstrates its use as a decision-making tool to guide purchasing decisions across an entire array of food purchases.

Considering the world population, an additional 415.1 billion m² of built floor will be needed by 2050, which could worsen the environmental impact of the construction industry that is responsible for one-third of global Carbon Emissions (CEs). Thus, the current construction practices need to be upgraded toward eco-friendly technologies. Building Information Modeling (BIM) proved a significant potential to enhance Building and Infrastructure (B&I) ecological performances. However, no previous study has evaluated the nexus between BIM and B&I CEs. This study aims to fill this gap by disclosing the research evolution and metrics and key concepts and tools associated with this nexus.

A mixed-method design was adopted based on scientometric and scoping reviews of 52 consistent peer-reviewed papers collected from 3 large scientific databases.

This study presented six research metrics and revealed that the nexus between BIM and CEs is a contemporary topic that involves seven main research themes. Moreover, it cast light on six key associated concepts: Life Cycle Assessment; Boundary limits; Building Life Cycle CE (BLCCE); Responsible sources for BLCCE; Green and integrated BIM; and sustainable buildings and related rating systems. Furthermore, it identified 56 nexus-related Information and Communication Technologies tools and 17 CE-coefficient databases and discussed their consistency.

This study will fill the knowledge gap by providing scholars, practitioners and decision-makers with a good grasp of the nexus between CEs and BIM and paving the path toward further research, strategies and technological solutions to decrease CEs of B&I sectors and their impacts on the climate change.

A greenhouse gas (GHG) inventory was conducted for Yale University's procurement of goods and services over a one‐year period. The goal of the inventory was to identify the financial expenditures resulting in the greatest “indirect” GHG emissions. This project is part of an ongoing effort to quantify and reduce the university's environmental impacts.

The impacts of institutional purchases were analyzed using publicly available economic input‐output life cycle assessment software. This model allows users to estimate the indirect GHG emissions of procured goods and services using expenditure data for different categories of purchases. The results are based on national averages for the USA.

The findings of this inventory indicate that indirect GHG emissions from procured goods and services are the greatest source of the university's emissions. A total of 15 of the university's 142 financial expenditure categories accounted for 80 percent of the GHG emissions. Many of these categories were expected, including energy purchases, construction activities, and air travel. Others were more surprising, particularly architectural and engineering services, laboratory supplies, and software.

This study is expected to assist Yale University in its efforts to reduce GHG emissions by providing a quantitative basis for prioritizing green supply chain management decisions.

This study demonstrates that universities and other organizational entities can proficiently assess indirect GHG emissions from goods and services using publicly available software, and that these efforts are significant for understanding the environmental impacts of higher education.

The primary driver of future aviation has recently been sustainability. The rapid development of radically new, disruptive technologies and solutions should be regularly evaluated to maintain the desired trends in sustainable aviation. The purpose of this research can be listed as follows: (i) to propose a sustainable performance index and methodology (ii) to evaluate the new technologies and solutions, and (iii) apply them to evaluate the effect of technologies and solutions under development.

This paper introduces a total sustainable performance index for evaluating the sustainability; demonstrates its applicability to future development processes; recognizes the supporting new technologies and solutions by implementing their identification, evaluation and selection processes; and defines the major trends and drivers maintaining the sustainability of the future aviation.

This study has resulted in a proposed new “total sustainable performance index,” and methodology of identifying key drivers that allow defining the technology and solution-driven trends, and defines the major trends and listed technologies and solutions that may have a determining role in given trends.

There are dilemmas on taking into account the positive effects of aviation on the economy and society that may overwrite the costs and limited information about the foresight on new technologies and solutions.

It depends on access to required inputs.

Two-way effects of solid expectations of society on the possible greening of aviation can be listed as the social implication of this research.

The proposed “total sustainability performance index” totally evaluates sustainability, including a penalty, considering the policy (regulation) and interest of future generations.

Titanium dioxide pigments have been produced commercially for eight decades. The industry has seen many developments from the humble beginnings with uncoated, impure, anatase pigments to the highly refined TiO₂ pigments of today. For the past four decades there have been two commercial routes for making TiO₂ pigments ‐ sulphate and chloride. In recent years, significant efforts have been made to produce TiO₂ by both routes with greater environmental awareness. To compare the overall impact of TiO₂ manufacturing processes on the environment, life‐cycle assessments of several process options are described in this paper.

This chapter provides a legal and theoretical overview of environmental PPMs articulated in private standards. It seeks to expand the debate about environmental PPMs, elucidating important dimensions to the issue from the perspective of global governance and international trade law. One of the arguments advanced in this chapter is that a comprehensive analysis of environmental PPMs should consider not only their role in what is regarded as trade barriers (governmental and market driven) but also their significance in global objectives such as the transition towards a green economy and sustainable patterns of consumption and production.

This chapter is based on an extensive literature review and doctrinal legal research.

This research shows that environmental PPMs represent a key issue in the context of the trade and environment relationship. For decades such measures have been thought of as being trade distortive and thus incompatible with WTO law. Although it seems clear now that they are not unlawful per se, their legal status remains unsettled. PPMs can be regarded as regulatory choices associated with a wide range of environmental concerns. However, in trade disputes, challenged measures involving policy objectives addressing production issues in the conservation of natural resources tend to focus on fishing/harvesting techniques. On the other hand, an important goal of Global Environmental Governance (GEG) is to incentivise sustainable consumption and production in order to achieve the transition to a green economy. In this sense, it can be argued that what are generally denominated as ‘PPMs’ in the WTO terminology can alternatively be regarded ‘SCPs’ in the language of environmental governance. Environmental PPMs are not only limited to state-based measures, such as import bans, tariff preferences, and governmental labelling schemes. Environmental PPMs may also amount to good corporate practices towards environmental protection and provide the rationale for numerous private environmental standards.

Most academic attention afforded to environmental-PPMs has focused on their impacts on trade or their legality under WTO law. Although legal scholars have already referred to the significance of such measures in the context of environmental governance, this issue has remained almost entirely unexplored. This chapter seeks to fill the gap in the literature in this regard. In particular, it addresses the relevance of environmental PPMs in the context of decentralised governance initiatives such as the UN Global Compact and private environmental standards.

Overall, this chapter assists in the understanding of the significance of environmental PPMs in the context of private environmental standards and other governance initiatives involving goals related to sustainable consumption and production. This chapter adds to the existing body of literature on the subject of PPMs in international trade and environmental governance.

Pharmaceutical and personal care products (PPCPs) and phosphorus are pollutants that can cause a wide array of negative environmental impacts. Phosphorus is a regulated pollutant in many industrial countries, while PPCPs are widely unregulated. Many technologies designed to remove phosphorus from wastewater can remove PPCPs, therefore the purpose of this paper is to explore the ability of these technologies to also reduce the emission of unregulated PPCPs.

Through meta-analysis, the authors use the PPCPs’ risk quotient (RQ) to measure and compare the effectiveness of different wastewater treatment technologies. The RQ data are then applied via a case study that uses phosphorus effluent regulations to determine the ability of the recommended technologies to also mitigate PPCPs.

The tertiary membrane bioreactor and nanofiltration processes recommended to remove phosphorus can reduce the median RQ from PPCPs by 71 and 81 percent, respectively. The ultrafiltration technology was estimated to reduce the median RQ from PPCPs by 28 percent with no cost in addition to the costs expected under the current phosphorus effluent regulations. RQ reduction is expected with a membrane bioreactor and the cost of upgrading to this technology was found to be $11.76 per capita/year.

The authors discuss the management implications, including watershed management, alternative PPCPs reduction strategies, and water quality trading.

The evaluation of the co-management of priority and emerging pollutants illuminates how the removal of regulated pollutants from wastewater could significantly reduce the emission of unregulated PPCPs.

Circular economy (CE), as a new economic paradigm, has gained traction in recent years. Cities' role in driving CE forward has been perceived as being increasingly important to achieve sustainable development (SD). For this reason, there is an urgency to understand what a circular city is and how it might be composed. This research explores the ways in which the city-state of Singapore is transitioning to a CE.

A systematic literature review on CE and cities was carried out using a bibliometric review and a snowballing technique. This review was performed on academic and on non-academic papers.

This research has confirmed the lack of robust circular cities case studies. As Singapore has already begun its journey towards circularity, this article examines its current efforts and offers recommendations in the design and implementation of CE policies that may be valuable not just for Singapore but also for high-density and rapidly expanding cities around the world that require a new development pathway to emulate.

This manuscript is the first detailed, independent and comprehensive review of Singapore's approach to CE.