Global Greenhouse Gas Emissions Research Articles

Technical and economic assessment of hydrogen-based electricity generation from PV sources in tertiary buildings: a case study of a hospital building in Algeria.

The largest anthropogenic source of carbon dioxide emissions is the global energy system, which means transforming the global energy system is one of the most significant ways to reduce greenhouse gas emissions and mitigate climate change. Buildings play a critical role in our transition to a lower-carbon future, accounting for approximately 47% of global energy consumption and about 25% of global greenhouse gas emissions. Renewable hydrogen represents one of the most environmentally friendly options for energy generation. This study presents an energetic, economic, and environmental impact of a self-sufficient system for energy production from renewable energy sources in buildings. To achieve this objective, a hydrogen-based generation system was selected to meet all the electrical requirements of tertiary building in Algeria throughout the year. The results indicate that the hybrid renewable energy system can avoid the emission of approximately 1056 tons of carbon dioxide per year. Furthermore, the payback period is 7years. These results clearly demonstrate that the integration of hydrogen energy in buildings is the optimal choice for environmental sustainability.

Decarbonizing Affordable Housing in New York City

Buildings account for about 30% of global greenhouse gas emissions. Retrofitting existing buildings for electrification and energy efficiency is a necessary first step toward building decarbonization. For the City of New York to reach its ambitious decarbonization goals, the city must create market conditions to allow rapid scaling up of deep energy retrofits. RiseBoro Community Partnership delivered one such innovative deep energy retrofit project called Casa Pasiva. This case study reveals ways in which affordable housing developers are uniquely positioned with many supporting policies in New York to become early adopters of deep energy retrofits, given their need to improve both business operations and tenant health. However, future projects still face steep obstacles ranging from funding gaps, a lack of familiarity with new building technologies, and conservative investors. RiseBoro’s successful Casa Pasiva pilot project identifies many of the remaining challenges related to deep energy retrofit capital projects as well as further opportunities to scale necessary retrofits across the New York affordable housing market. Readers will learn about options for and obstacles to implementing and scaling up deep energy retrofits in the affordable housing industry.

Studying long term relationship between carbon Emissions, Soil, and climate Change: Insights from a global Earth modeling Framework

The persistent increase in greenhouse gas (GHG) emissions, notably carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O), since the mid-20th century has been a key driver of significant climate alterations. This study investigates the complex feedback mechanisms that both influence and are influenced by global climate dynamics, soil processes, and GHG emissions. Our statistical approach incorporates correlation measures, highlighting the limitations of such analyses, namely their inability to confirm causality, sensitivity to outliers, and the exclusive capture of linear relationships. Geographically Weighted Regression (GWR) models reveal spatial variations in the relationship between environmental factors and GHGs, while Path Analysis aids in delineating direct and indirect influences among variables. The research pinpoints significant spatial heterogeneity in the impacts of economic and environmental factors on GHGs, underscoring the necessity of localized strategies for climate change mitigation and sustainable land management. This study also identifies potential threats to agricultural productivity due to soil degradation, which hinder climate adaptation efforts. Our findings advocate for a concerted global response to reduce GHG emissions and address the challenges posed by the interplay of climate change, soil dynamics, and GHG emissions.

We cannot afford another lost year for food and climate action

ABSTRACT In recent years, recognition has grown of the significant role that food systems play in driving climate change, constituting about one-third of global greenhouse gas emissions, while also playing a key role in sequestering carbon and adapting to climate changes. The COP28 climate conference signaled a pivotal shift, spotlighting food and agriculture in discourse. However, despite pledges and declarations, concrete plans and targets to address emissions from food chains remain elusive. Urgent action is imperative to transform food systems and avert surpassing critical warming thresholds.

Examining elevation and thermoregulatory trait differences of endemic tropical swallowtail butterflies to assess their vulnerability to climate change

Abstract Tropical montane insects are vulnerable to climate change if up‐hill range retractions reduce range sizes and increase extinction risk. Endemic species will be particularly at risk if they disproportionately occur at higher elevations, although threats may be ameliorated if they have morphological traits associated with improved thermoregulatory ability. We examine the vulnerability of endemic swallowtail butterflies on Sulawesi (Indonesia) to climate change by quantifying inter‐specific variation in traits associated with thermoregulation (body size and melanism) and whether species' traits are associated with the elevation of species' ranges. We collected data on size, melanism and elevation of 29 swallowtail butterfly species (Lepidoptera: Papilionidae) from 754 specimens at the Natural History Museum (United Kingdom) and the Zoologische Staatssammlung München (Germany). Endemic butterflies were less melanised (16 endemic species, mean = 83% melanised; 13 non‐endemic species = 89% melanised) but similar to non‐endemics in size (endemic, mean = 56 mm; non‐endemic = 53 mm) and elevation (endemic, mean = 345 m.a.s.l.; non‐endemic: 291 m). There was no evidence that species size or melanism patterns were related to elevation in either group. Few differences in elevation of endemic and non‐endemic species imply that endemic swallowtail butterflies are not disproportionately more threatened by climate‐driven mountaintop extirpation than non‐endemic species. Further work is needed to examine whether paler wings alter the ability of endemic species to thermoregulate and adapt to changing climates. In the absence of reductions in anthropogenic global greenhouse gas emissions, on‐going climate warming will continue to threaten tropical montane species.

A Grand Challenge: Net-Zero Operations—Changing the Definition of “Business as Usual”

_ This is the second of a series of six articles on SPE’s Grand Challenges in Energy, formulated as the output of a 2023 workshop held by the SPE Research and Development Technical Section in Austin, Texas. Described in a JPT article last year, each of the challenges will be discussed separately in this series: geothermal energy; improving recovery from tight/shale resources; net-zero operations; carbon capture, storage, and utilization; digital transformation; and education and advocacy. The first article, “An SPE Grand Challenge Update on Geothermal Energy,” was published in April 2024. _ At COP28, more than 50 oil and gas companies, many of them national companies, took a historic step toward decarbonization by launching the Oil & Gas Decarbonization Charter. The charter represents significant short- and long-term ambitions to reduce emissions, including net-zero operations by 2050 at the latest. This article explores the importance of this effort, the opportunities available to the industry to reduce its Scope 1 and 2 emissions, and the key technologies needed to achieve the net-zero goal. The Size of the Prize According to the latest data from the International Energy Agency (IEA), the production, transport, and processing of oil and gas resulted in 5.1 GtCO2e in 2022. These emissions stem from the production and delivery of oil and gas and the combustion of fossil fuel necessary for operations on-site (Scope 1), and the import of electricity from external sources consumed in oil and gas facilities (Scope 2). These Scope 1 and 2 emissions represent just under 15% of global energy-related greenhouse gas (GHG) emissions. This is a sizable contribution, nearly equivalent to all energy-related GHG emissions from road transport, highlighting the relative scale of the opportunities associated with implementing operational changes in the industry. The faster and deeper these emissions reductions are, the more significant the impact will be. Sources of Emissions To understand the various paths to net zero an oil and gas company can follow, it is critical to map the sector’s sources of emissions throughout the value chain. It is generally recognized that around 60% of an integrated company’s emissions emanate from upstream operations, predominantly from onshore assets. Refining and distribution are the second main contributors, but of a smaller order of magnitude, notably because of significant efforts already made by companies to reduce emissions from their refining assets and levers of decarbonization potentially easier to implement. However, emissions volumes and intensities differ significantly across regions, countries, and asset types. An asset operating in the Canadian oil sands region will have a very different emissions profile compared to an offshore platform in Western African countries. These differing profiles also call for tailored emission-reduction approaches. This means decarbonization studies must be carried out at the asset level, allowing operators to identify the most cost-effective means of tackling emissions reduction.

The Role of Natural Gas in the Socio-Technical Transition to a Carbon-Neutral Society and a Review of the European Union’s Framework

The urgent need for a significant reduction in global greenhouse gas emissions indicates that the change in the world’s energy mix is inevitable. In the power production sector, this would be achieved through decarbonization with renewables, and within the transport sector, this would be achieved by switching to alternative fuels and electric vehicles. However, this transition is neither fast nor cheap, and it will be gradual. The main goal of this article is to propose a feasible change in the present energy mix and to compare natural gas with other fuels used in power production and transport. The strengths, weaknesses, opportunities, and threats of the current system (traditional fossil fuels) and the potential future system (higher share of natural gas) in energy generation and transport were identified, and the influence of recent global trends was analyzed. Natural gas seems to be a viable solution that can help in the transition to a zero-carbon-emissions society.

A Study of Greenhouse Gas Emissions in Afghanistan

Afghanistan stands as one of the leading contributors to global greenhouse gas emissions, yet it remains one of the most susceptible nations to the adverse impacts of climate change. This vulnerability is underscored by recurrent episodes of droughts, floods, and landslides, exacerbated by the nation's exposure to natural disasters. However, the crux of this vulnerability lies not solely in exposure but also in the heightened sensitivity of the Afghan populace to these calamities. In light of Afghanistan's poverty and relatively underdeveloped status, any immediate expectation of curtailing greenhouse gas emissions appears unrealistic and unjust. The nation faces a paradoxical challenge balancing burgeoning emissions, inevitable amid developmental strides, with safe-guarding the interests of the impoverished populace. The heart of this challenge lies in ensuring that the trajectory of rising emissions aligns with uplifting the socioeconomic status of the vulnerable. This research delves into the complex interplay between Afghanistan's greenhouse gas emissions, its developmental trajectory, and the vulnerability of its population to climate change. By scrutinizing these facets, it aims to unearth pathways that reconcile developmental needs with environmental consciousness, with a paramount focus on securing the most marginalized against the dire consequences of climate change.

Climate Governance Pathway for BRICS in the Post-Paris Era

BRICS countries comprise 41.87% of the world’s population and generate over 42% of the global greenhouse gas emissions. As the largest political cluster in global climate governance, their positions and alignment in the post-Paris Agreement era would determine the future trajectory of climate governance for the international communities. This article aims to ascertain the respective positions of BRICS nations by examining their nationally determined contributions and targets for carbon peak and neutrality. Through this analysis, the article endeavors to consolidate a comprehensive BRICS decarbonization roadmap, providing stakeholders and policymakers with greater clarity. In addition, in-depth case studies from China and India, the two biggest emitters, offer valuable insights into their climate mitigation paths. This would inspire unity among the BRICS countries and encourage them to uphold the stability of their partnership in climate governance collectively.

Analysis of critical factors affecting green office retrofits based on the latest green building regulations in Indonesia

The construction industry is responsible for over 40% of global energy consumption and one-third of global greenhouse gas emissions. Generally, 10%–20% of energy is consumed in the manufacturing and transportation stages of materials, construction, maintenance, and demolition. The way the construction industry to deal with these impacts is to intensify sustainable development through green building. The author uses the latest Green Building Certification Standard in Indonesia as the Green Building Guidelines under the Ministry of Public Works and People’s Housing (PUPR) Regulation No. 01/SE/M/2022, as a basis for evaluating existing office buildings or what is often referred to as green retrofit. Structural Equation Modeling-Partial Least Squares (SEM-PLS) is used by the authors to detail the factors influencing the application of green building by analyzing several variables related to the problem studied, which are used to build and test statistical models of causal models. From this study, it is concluded that the most influential factors in the implementation of green retrofitting on office buildings are energy savings, water efficiency, renewable energy use, the presence of green building socialization programs, cost planning, design planning, project feasibility studies, material cost, use of the latest technology applications, and price fluctuations. With the results of this research, there is expected to be shared awareness and concern about implementing green buildings and green offices as an initiative to present a more energy-efficient office environment, save operating costs, and provide comfort to customers.

Integrated e-Methanol and Drop-in Fuels Hydrothermal Liquefaction Platform-Techno-Economic and GHG Emissions Assessment for Grid-Connected Plants under Flexible BECCU(S) Operation.

This study examines the combined production of drop-in fuels and methanol using hydrothermal liquefaction (HTL) as a technological basis in the context of bioenergy and power-to-X (PtX) applications. Given the increasing need for flexibility in a system dominated by fluctuating renewable power, we evaluated flexible methanol operation as a strategy to harness global greenhouse gas (GHG) emissions in a grid-connected HTL setup. In this operation, the biogenic CO2 destination is alternated between methanol synthesis bioenergy with carbon capture and utilization and combined underground storage depending on the hourly electricity price and grid carbon intensity. The results indicate that the strategy has potential to maintain the average fuel carbon intensity within the 65% GHG reduction threshold set by the renewable energy directive III at a minimum methanol price of 870 EUR/t. This approach could facilitate implementation as it does not require dedicated renewable power generation and hydrogen storage, potentially decreasing costs compared to semi-islands and off-grid PtX systems.

Impact of endogenous learning curves on maritime transition pathways

The maritime industry is a crucial hard-to-abate sector that is expected to depend on high-energy density renewable liquid fuels in the future. Traditionally, decarbonization pathways have been assessed assuming exogenous cost trajectories for renewable liquid fuels based on an exogenous learning curve. While past studies have looked at the impact of endogenizing learning curves for a specific technology utilizing linear approximation, a fully endogenous direct non-linear implementation of learning curves in a detailed sectoral model (maritime industry) that explores dynamics concerning sensitive parameters does not yet exist. Here, we apply an open-source optimization model for decarbonizing the maritime industry and further develop the model by encompassing a nonconvex mixed-integer quadratically constrained programming approach to analyze the impact of endogenized learning curves for renewable fuel costs following an experience curve approach. We find that global greenhouse gas emissions are significantly lower (up to 25% over a 30 year horizon) when utilizing endogenously modeled prices for renewable fuels compared to commonly used exogenous learning frameworks. Furthermore, we find that conventional modeling approaches overestimate the cost of climate mitigation, which can have significant policy implication related to carbon pricing and fuel efficiency requirements. In a broader context, this emphasizes the potential opportunities that can be achieved if policymakers and companies accelerate investments that drive down the costs of renewable technologies efficiently and thus trigger endogenous experience-based learning in real life.

Electrochemical analysis of carbon steel embedded in mortars with pretreated copper tailings as supplementary cementitious material

The cement industry, responsible for 8% of global greenhouse gas emissions, necessitates developing sustainable materials to replace cement partially. This investigation examined the feasibility of using copper tailings, a byproduct of mining, as alternative materials for cement within mortars and reinforced mortars (0–15 wt%). The microstructural composition of the tailings was analyzed using scanning electron microscopy and X-ray diffraction. The corrosion resistance of mortars reinforced with copper tailings was elucidated through open-circuit potential measurements and electrochemical impedance spectroscopy. The results showed that incorporating 5 and 10 wt% of sieved copper tailings improved the mechanical strength and significantly enhanced the electrochemical stability, as indicated by more noble open-circuit potential values. Specifically, the sieved tailings played a crucial role in forming a more stable oxide film, which was confirmed by higher impedance values, suggesting a reduced corrosion rate. In contrast, mortars with 5 wt% of milled tailings exhibited properties like those of the control group. This electrochemical understanding highlights the potential of processed copper tailings in mitigating the environmental impact of cement production and enhancing the durability of cementitious composites.

Simulink Model for LMV and Conceptualization of 2 Speed E-Axle

Heavy-duty trucks are the primary contributor to the global emissions of greenhouse gases. Because of this, electric haulage has seen significant growth in popularity. Electric heavy-duty trucks aren't widely adopted because of their limited range, payload capacity, and high prices. Electric axle systems, sometimes known as "E-Axles," are capable of electrifying heavy-duty vehicles effectively. The motor, power electronics, and gearbox are all combined into one unit in an E-axle. E-axles that are devoid of motors and gearboxes have the potential to boost performance while also reducing weight and fuel consumption. Heavy-duty automobiles are similar to them. E-axles have the potential to increase the fuel efficiency, flexibility, and emissions of heavy-load trucks. The e-axles are being inspected. E-axles for heavy-duty trucks bring both issues and opportunities concerning finances, infrastructure, and costs. Examine the performance standards as well as the technology behind batteries. This paper provides an introduction to MATLAB Simulink, which focuses on engineering and science. Simulink facilitates the design, simulation, and evaluation of systems. This article demonstrates the fundamental principles, features, and benefits of Simulink through the application of system modeling, control design, and dynamic simulation. It presents Simulink methodologies, libraries, and blocks, as well as interactive simulations.
 Keywords: MATLAB, Simulink, EV Control systems, EV simulation, EV powertrain modeling, EV test and validation Simulink, WLTP drive cycle

Examining Opportunities and Challenges for Addressing the Climate Impact of Aviation: A Narrative Review

Aviation is responsible for about five per cent of global greenhouse gas emissions through the burning of fossil fuels. This analysis explores the potential and obstacles of measures to reduce travel, energy use, and emissions in order to lessen aviation's impact on the climate in Sweden. Various efforts have been made to decrease aviation's climate impact, from regulations to alternative technologies for jet fuel. These efforts face multiple challenges, many rooted in social and political issues that are often overlooked in favour of technological fixes. One major hurdle is creating a market for alternatives to traditional jet fuel as consumer awareness and willingness to invest in these innovations remain limited. Current policy measures have proven ineffective at driving change; an understanding of aviation as a socio-technical system is essential moving forward. The significance of this review lies in its comprehensive examination of ways to diminish aviation’s climate impact, presenting new perspectives and identifying areas for further research by considering all components, their interactions, and interdependence.

Global Versus Regional Carbon Taxation: Exploring a Natural Experiment

The reduction of global greenhouse gas emissions has priority due to climate change. Scientists across disciplines promote carbon taxation or carbon pricing as an instrument to mitigate the negative externality of fossil energies. We exhibit two insufficiencies of today’s regulatory policy by utilizing a novel natural experiment. First, carbon taxation is only effective if it is implemented on a global scale because fossil energy markets and emissions are cross-border and global. Second, carbon taxation is based on an extrinsic mechanism and does not alter intrinsic behaviour sustainably. Our applied theory and modelling approach is corroborating these findings. The present regulatory approach is doomed to fail due to overambitious European countries and unambitious (partly realistic) rest of the world. Our interdisciplinary analysis unravels a new agenda to achieve the essential aim. What is needed is a global climate club, as proposed by Nobel Laureate William Nordhaus, with a least but global greenhouse gas reduction.

Solar-assisted clean steam generator, a cleaner production approach for sustainable healthcare facilities

Healthcare sector buildings, particularly hospitals, significantly contribute to global energy consumption and greenhouse gas emissions. Hospitals require a substantial amount of steam, including the essential hygienic or “clean steam,” that is currently supplied mostly by heaters and fossil fuel-based boilers. This study proposes a solar-driven clean steam generator, employing LS-2 parabolic trough collectors with Therminol VP-1 as the working fluid, to supply clean steam in hospitals. The system was designed and techno-economically assessed for two case study hospitals in Denmark and Sweden using MATLAB. The proposed system's proficiency was compared against existing solutions, revealing that it can contribute up to 19% and 22% of the energy requirements for the Danish and Swedish hospitals, respectively, in certain months. While the design may not enhance energy and exergy efficiencies due to inherent losses, it significantly reduces environmental impact, preventing 67.8 tons and 75.5 tons of equivalent CO2 emissions per year for the Danish and Swedish hospitals, respectively. This innovation aims to contribute to the healthcare sector's sustainability.

Carbon finance and funding for forest sector climate solutions: a review and synthesis of the principles, policies, and practices

The question of funding necessary climate actions, including those in the forest sector, to drastically reduce greenhouse gas (GHG) emissions and global warming, is important to both national governments and international agencies. The objective of this paper is to address this question by reviewing and synthesizing the economic principles associated with reducing GHG emissions, the pricing mechanisms used to achieve that goal, and the diverse practices of climate finance. Included in the carbon pricing mechanisms and practices are carbon tax, compliance and voluntary emission trading, internal pricing, and funding via issuing bonds or mobilizing public budgetary resources. Then, it proceeds to describe the roles that public and private organizations can play and have played in supporting emission reduction and removal, which serves as a vital backdrop for examining current states and relative costs of forest sector initiatives. Overall, as reported by the World Bank, only about 23% of global GHG emissions are subject to any explicit price, and 75% of the emissions that are subject to a price are charged less than $10 per tCO2e. Market-based forest finance and international support for reducing emissions from deforestation and forest degradation have accounted for a small fraction of the total spent on climate mitigation and adaptation. Further, the more recent developments in carbon pricing and funding remain slow and disappointing. Without the right scale of green finance at the right time, however, it will be difficult to achieve the needed energy and economic transformation.

Bad avocados, culinary standards, and knowable knowledge. Culturally appropriate rejections of meat reduction

Cultural conventions are central to tackling unsustainable consumption. In the Global North food conventions are increasingly contested due to the political importance of climate change and the share of global greenhouse gas emissions tied to animal food production and consumption. Significant reductions in meat consumption are touted as pathways to adaptation, but most consumers remain committed to consuming meat-based meals and diets with meat. To explore how consumers handle these issues in today’s cultural context, this article examines culturally appropriate ways of rejecting meat reduction. The theoretical framework is based on interactionism and accounts. The empirical material is from focus group discussions with Danish consumers. We find that in discussions about using plant-based meat, norms of proper culinary conduct are held to be more pressing guides for normative assessment than climate impacts. We also show that the status and function of climate impact “knowledge” is complex and ambiguous. A shared social knowledge of the climate impacts of meat consumption appears to exist alongside “questionable knowledge” and “lack of knowledge”, both of which are referred to excuse, justify, and charge others in reasoning supporting continued meat consumption. Knowledge of climate impacts is accepted when it fits cultural conventions but appears less knowable if it poses challenges to contemporary consumer culture. The article contributes insights into the ways in which cultural conventions and complex knowledge negotiations help to preserve unsustainable consumption.

Utilisation of Reused Steel and Slag: Analysing the Circular Economy Benefits through Three Case Studies

This research explores sustainable construction practices focusing on material reuse, specifically reclaimed structural steel and slag. In general, the building stock is not designed for deconstruction, and material recovery for reuse at the end of life of buildings is complex and challenging. The study evaluates the benefits of content reuse through a thorough analysis of three case studies—BedZED eco-friendly housing, Angus Technopôle building, and the use of steel slag aggregate in road construction. It highlights the value of reclaimed structural steel and by-products like steel slag in waste reduction, energy conservation, and resource preservation. The BedZED case study showcases recycled steel’s cost-effectiveness and economic viability in construction, while the Angus Technopôle building exemplifies the adaptive reuse of an old steel frame building. Additionally, the third case study showcases the benefits of using Electric Arc Furnace C slag in asphalt-wearing courses, highlighting the reduction in greenhouse gas emissions and environmental impact. The versatility of reclaimed structural steel and slag is evident in integrating material reuse in building construction and road infrastructure. These case studies illustrate the potential for reusing steel and its by-products in various construction contexts, from eco-friendly housing to road development. Therefore, the study aims to demonstrate the feasibility and benefits of sustainable practices within the construction industry by showcasing the successful incorporation of reclaimed steel and slag in these projects. Considering the significant contributions of building construction to global greenhouse gas emissions, raw material extraction, and waste production, the study advocates for adopting circular economy (CE) principles within the construction industry. Finally, the analysis of case studies underscores the advantages of reclaimed structural steel and the valorisation of steel slag through the lens of CE and their contribution to sustainable development.