Tons Of CO2-eq Research Articles

Bioenergy-livestock integration in Brazil: Unraveling potentials for energy production and climate change mitigation

Future projections indicate an expansion for both food and energy demands, which can increase pressure on land use, while there is an urgent global need for climate change mitigation. Bioenergy is foreseen as key option to meet future energy demands and reduce greenhouse gas (GHG) emissions, however its sustainability depends on locations and regional characteristics. Simultaneously, agricultural production models that co-produce food, feed, and energy offer sustainability synergies and co-benefits, but site-specific sustainability assessments of their large-scale implementation are missing. This study presents a bottom-up approach to assess spatially explicit sustainability aspects of bioenergy-livestock integrated systems (BLI) in Brazil and shed light on their contribution to future energy demands, to climate change mitigation targets, and their impacts on selected ecosystem services, including bioenergy production, climate change mitigation, reduction of food competition, biodiversity conservation, and avoided deforestation. The proposed integration considers livestock intensification and use of biofuels by-products as animal feed supplement, taking advantage of synergies between these two value chains. The expansion of the BLI system in the Center-South region of Brazil produce up to 89 billion liters of ethanol, enough to meet future domestic ethanol demands from multiple shared socioeconomic pathways and generating surpluses for export. This production takes place on 16 million hectares of pastureland within the Sugarcane Agroecological Zoning, excluding the Amazon and Pantanal biomes, and biodiversity hotspots. BLI expansion mitigate up to 250 million tonnes of CO2eq and generate 15 billion dollars of profits. The best locations to maximize the selected ecosystem services are west of São Paulo, east of Mato Grosso do Sul, and the south-central region of the states of Goiás. This study may encourage the formulation of enhanced public policies for the integration of bioenergy and livestock value chains and guide a sustainable large-scale deployment of BLI systems.

Use of a Hybrid Approach to Estimate Greenhouse Gas Emissions from the Transport Sector in Palestine

The transport sector is the second leading emitter of greenhouse gas emissions (GHGEs) from fuel combustion activities on a global scale. Reducing emissions related to this sector requires detailed data about the emissions by vehicle type and traveled distance. Generally, these data are missing in developing countries, which makes difficult the establishment of effective policies for the reduction of these emissions. This paper presents a hybrid method to estimate these emissions using the IPCC 2006 guidelines. The method combines bottom-up and top-down approaches to estimate vehicular emissions using data about the vehicle type, vehicle kilometers traveled, and fuel consumption. This method is applied for the first time for the Palestinian territory. Data have been collected from the administration, official reports, and papers. The results show a significant increase in the total vehicles in Palestine, particularly diesel vehicles. Emissions from the on-road transport system were approximately 2,207,834 tons of CO2eq in 2019. Diesel vehicles were responsible for about 75% of these emissions. Private cars were the most significant contributor to these emissions, with a share exceeding 50% of the total emissions, followed by commercial vehicles and light trucks (20%), public taxis (9%), and buses (7%). These results show clearly that the GHGEs reduction policies in Palestine should focus on diesel and private vehicles by developing the public transport systems and replacing diesel and gasoline vehicles with more environmentally friendly vehicles, such as hybrid and electric cars.

Inclusiveness of Transmigration Women

The purpose of this study was to analyze the activities of the Anggrek Dewata program as a form of inclusiveness for transmigrant women in Air Talas Village, Rambang Niru District, Muara Enim Regency, South Sumatra. The method used in this study is descriptive qualitative by analyzing the impact of the program with social, economic and environmental dimensions. The results show that with the Orchid Dewata program, as a form of inclusiveness implemented in Air Talas Village, namely the formation of women farmer groups (KWT), training of citrus derivative products into pie, syrup and marmalade, construction of a production house as a container and management of kwt production, P-IRT and HALAL certification to increase consumer confidence in the product. So that the activities can increase the group's economic income by as much as IDR 2,000,000/month/member. In addition, from an environmental point of view, the activities have been able to reduce unused sour orange waste by 1 ton and reduce GHG emissions by 3,504 Tons of CO2eq.

Production and characterization of ecological fire starter from sawdust and vegetable oil

The objective of this article aims to reduce indoor air pollution through the use of ecological fire starter (EFS) made from sawdust and vegetable oils. In the Far North region of Cameroon, plastic waste is used to ignite and stoke solid fuels fires, exposing mainly women and children who are responsible for cooking to health risks from indoor air pollution. Thus, the survey conducted among the population of the region shows that 96% of urban households use plastics waste made with LDPE, HDPE, PET, PS, PP and EVA as fire starter for solid fuels. In the region, 5544 tons of plastic used by households could emit approximately 15,314 tons of CO2 eq per year. The region has a manufacturing capacity of 1000 tons of EFS while its need is 894 tons in 2022. The lower heating value of the EFS varies between 31.914 ± 0.810 and 25.127 ± 0.026 MJ/kg, and have many ecological health and economic advantages. A household needs about 10 g of EFS to ignite solid fuel per day, with an annual expenditure ranging from 5.5 and US$ 7 to purchase EFS. Therefore, it is important to promote EFS through developing countries and look for another way to recover plastic waste.

Reusable laryngoscope blades: a more eco-responsible and cost-effective alternative

IntroductionConsumption of single-use medical devices has increased considerably, contributing to the excessive wastage produced during surgical procedures. The present study aimed to describe a methodology to assess the transition from single-use blades (SUB) to reusable laryngoscope blades (RUB) and to assess the ecological and economic impact of the switch. MethodsThe ecological analysis was based on the life cycle assessment method. Based on 30 operating rooms in a single tertiary university hospital, the economic analysis compared the usual SUB supplier with four RUB suppliers considering different costs: blade purchasing and depreciation, reprocessing, logistics and waste management. ResultsIn 2021, 17,200 intubations were performed requiring about 147 RUBs. Switching from SUB to RUB led to an annual saving of 26.5 tons of CO2eq (global warming impact), equivalent to 120 000 km by car. It avoids the extraction of 6.6 tons Oileq (petroleum) and 579 kg of copper (mineral resources) per year. This action also leads to a land occupation reduction of 626 m2 per year and water savings of 221.6 m3 per year. The average cost per intubation varies from 3.16 [3.15–3.16] for SUB to 2.81 [2.77–2.85] for RUB, representing an average saving of 0.35 per intubation leading to 5783.50 annual gain [5074.00–6192.00]. RUB are preferable from 3 and 86 uses from an ecological and economic viewpoint, respectively. ConclusionIn a model of 17,200 intubations /year, switching SUD to RUB would save 26.5 tons of CO2eq and 6.6 tons of Oileq with 5783.50 annual gain. RUBs are ecologically and cost-effective after 3 and 86 uses, respectively.

Modeling and performance analysis of solar parabolic trough collectors for hybrid process heat application in Kenya’s tea industry using system advisor model

Among the Concentrated Solar Collector (CSC) technologies, Parabolic Trough Collector (PTC) is the most mature and commercialized CSC technology today. Currently, solar PTC technology is mainly used for electricity generation despite its huge potential for heating, especially in industrial process heat (IPH) applications. Though the technology is well-developed and successfully used in many developed countries, there is barely any development in Kenya. This paper studies the techno-economic feasibility of a solar PTC-assisted tea drying process in one tea factory that currently relies on biomass for process heat, in the tea producing area of Kericho, Kenya. The plant integrating parabolic troughs is modelled and a yearly simulation performed using System Advisor Model (SAM) software. The weather data are derived from ground measurements at Kericho meteorological weather station. SAM is used to model the impact of the principal design parameters, i.e., solar multiple (SM), thermal energy storage (TES) and hybridization percentages, on solar–biomass plant configurations, and to reveal the optimum case. The studied impacts are linked to the annual energy production and the optimal size which minimizes the levelized cost of heat (LCOH). Analysis of monthly variations of energy production by the solar PTC reveals that even when the solar system is designed to its maximum capacity (SM of 3 and TES of 24 h), some months will still require hybridisation with biomass to fully meet the energy demand. TES must also be incorporated in the solar PTC design to maximise on energy production. The hybrid solar–biomass plant with TES provides optimal performance when SM is 1.8 and TES is 24 h. This results in LCOH of 1.85 US cents/kWh, which is 25% cheaper than using biomass only as is the current practice. Furthermore, integration of solar PTC has a positive impact on carbon footprint and considerably reduces annual greenhouse gas (GHG) emissions by 9817 tons of CO2-eq, and annual fuel wood consumption by 16,462 m3 (equivalent to 23.51 acres of mature grown trees).

The status and improvement opportunities towards carbon neutrality of a university campus in China: A case study on energy transition and innovation perspectives

In response to China's commitment to meet carbon peaking and carbon neutrality targets, universities are seeking to assess and minimize their greenhouse gas emissions. In this study, a new methodology based on LEAP and LCA was developed to assess the carbon footprint of a medium-sized university campus in eastern China. The emission sources consider six areas: electricity, fuel, transportation, water, waste, and consumption of other materials. The results showed that the campus emitted about 13,877 tonnes of CO2-eq in 2020. In particular, electricity consumption contributed about 77% of the total CO2-eq emissions on campus, while green cover and material recycling resulted in a negative emission of 404.4 tonnes of CO2-eq. In addition, seven common mitigation strategies were proposed to reduce the campus carbon footprint, and budgets would influence the implementation time. It was found that the seven proposed carbon reduction measures could reduce emissions by 97% in 2060, with decarbonisation of electricity being the largest contributor, leading to an emissions reduction of 64.7%. In addition, carbon offsetting is needed to achieve a carbon-neutral campus by 2060.

Energy and environmental study for the textile industry based on absorption heat transformer

ABSTRACT Many of the gases released by industrial processes pollute the environment and are largely responsible for climate change. Also, large amounts of low-temperature waste heat are generated by the industrial sector in different production processes. The waste heat can be recovered and reincorporated into the industrial process by means of an Absorption Heat Transformer (AHT), to reduce greenhouse gas emissions, reduce the consumption of fossil fuels, and increase energy savings. Therefore, three important aspects of the AHT are emphasized in this paper: first, the thermodynamics parameters of the AHT that influencing in its performance, second, heat recovery study and third CO2 emissions avoided analysis. For this purpose, a thermodynamic model was implemented for AHT using two working mixtures, namely, LiBr- H2O and Carrol-H2O. Besides, a heat recovery study was carried out considering the Mexican textile industry as a case study, to determine the stages of the textile process in which it is possible to return the recovered heat, as well as the best location to install an AHT. The results show that the Coefficient of Performance values increase when the absorber thermal levels range from 100 to 150°C, source temperatures from 80 to 90°C and condensation temperature from 25 to 30°C. The study of heat recovery in the textile industry describes that it is possible to install an AHT at five states in Mexico, with the potential to recover and return heat in 6 of the 7 stages of the textile process, it was also determined that with the Carrol-water mixture it is possible to obtain higher thermal levels in the absorber and recover more heat than with the water/lithium bromide mixture. The emissions analysis showed that the technology is environmentally sustainable by avoiding up to 119 tonnes of CO2eq per year into the atmosphere.

A pattern changes evaluation on household greenhouses gases during pandemic in Surakarta

The pandemic has caused a change in activity patterns that affect energy consumption and waste production due to restriction of activities. The purpose of this study is to find the changes in household GHG emission pattern during the pandemic in Surakarta Municipality. The focus of household GHG calculated in the study is electricity and liquid petroleum gas (LPG) consumption, waste production, and household batik industry. Greenhouse gases calculated with IPCC Guideline. Data activity used reference based approach. The total of household activity emission during the pandemic in Surakarta reaches 1035680.40 tonnes CO2eq, contributing to 33.5% of the total emission. The number comes from electricity consumption that produced 900709.38 tonnes CO2eq/year, LPG consumption that produced 107494.09 tonnes CO2eq/year, waste that produced 26050.44 tonnes CO2eq/year, and household batik industry that produced 1427.55 tonnes CO2eq/year. Monthly electricity consumption had 10% increase during the pandemic, surpassing the pre-pandemic highest value of 5.71%. LPG consumption had a decrease of 4.86%. Domestic waste production has an increasing trend of 36%, mostly containing inorganic waste (plastic). Pandemic created a new pattern on domestic electricity consumption.

Emission accounting, sectoral contributions and gridded spatial distribution of greenhouse gases in a typical petrochemical district of Shanghai

In this study, a petrochemical industrial district (PID) in the megacity of Shanghai was selected as a case study to investigate the quantity and components, sectoral contributions, and spatial distribution of greenhouse gas (GHG) emissions, including carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). The total GHG emissions from the PID were 25.86 million tonnes of carbon dioxide equivalent (CO2eq), of which CO2 made the largest contribution (96.9%), followed by N2O (2%) and CH4 (1.1%). In terms of the sectoral contributions, energy use and industrial processes and product use (IPPU) were the two major emission sources of GHGs, accounting for 76.14% and 23.17% of the total, respectively. Moreover, GHG emissions from energy use and IPPU in the petrochemical industry accounted for 36.1% of the total, indicating the significance of the petrochemical industry for GHG emissions. A high-resolution gridded (200 × 200 m) spatial distribution map of GHG emissions was created based on point source, line source, and area source databases, showing a clear difference in the emission levels of GHGs among the grids. Thirteen ultra-high grids with GHG emissions above 10,000 tonnes CO2eq, accounted for more than 90% of the total emissions in the PID, which should be given more attention in emission management programs. The results provided useful insights into the amount and composition, sectoral contributions, and gridded spatial distribution characteristics of GHG emissions in the petrochemical industry, and can be used by decision makers to develop refined management strategies for GHG emission reductions in typical petrochemical districts.

Research on digital energy carbon management platform and services for energy-using companies under the “3060” target

This study focuses on serving governments, enterprises and individuals related to digital energy carbon management. The National Grid provides digital carbon management services to electricity-using enterprises, solving the problems of high cost, difficulty and long lead time in managing carbon assets of electricity-using enterprises. We have innovated daily real-time carbon emission management services, carbon emission reduction services, carbon decision-making services, value-added carbon asset services and carbon trading services. Xinjiang Autonomous Region is a water-scarce and arid region which water resources are particularly important, so we choose the wastewater treatment industry in Xinjiang as a case study. The daily electricity consumption of Xinjiang Wastewater Treatment Plant A is 4063.75 kWh and the daily electricity consumption carbon emissions are 2.36 tonnes CO2eq, which is estimated to be about 2.78 tonnes CO2eq per day. the daily carbon emissions of the daily electricity consumption Wi of Xinjiang Wastewater Treatment Plant B is 3469.22 kWh and the daily electricity consumption carbon emission is 2.02 tonnes CO2eq, which is estimated to be 2.38 tonnes CO2eq. The carbon account value-added service provides carbon market users with transaction-assisted decision-making services, realizes accurate and efficient services, and helps society achieve the “3060” strategic goal of low-carbon green transformation.

Assessment of the benefits from energy recovery based on the greenhouse gas emission reduction scenario in urban landfills – A case study in Bac Lieu Province, Vietnam

Bac Lieu is one of the provinces with the fastest rate of socio-economic development and urbanization in the Ca Mau Peninsula and the coastal areas of the Mekong Delta Region (MDR). Like many other urban regions in Vietnam, Bac Lieu has always faced significant challenges in the management and treatment of municipal solid waste (MSW) and controlling greenhouse gas (GHG) emissions from landfills. This study was carried out to analyze and assess the profits gained from the scenario of minimizing GHG contributions in the Hoa Binh landfill, which is one of the largest landfills in Bac Lieu Province. On the basis of the circular economy orientation and planning MSW management with a vision to 2030, the EnLandFill 2019 software (ENvironmental information – model integrated system for air emission and dispersion estimation from LandFill) was applied. The highlight outcomes presented that from 2020 to 2035, the total GHG emission potential for the landfill gas recovery scenario was 19.270 thousand tonnes of CO2-eq, which was 7.978 times lower than the case of no recovery. Furthermore, the benefits achieved from the maximum capacity of electricity generation potential in 2032 are up to 1.932 million kWh/year with a power plant size of 220.540 MW. The research provided theoretical and practical implications, playing a crucial role as a driving force in promoting the development of provincial public policies and investments. Moreover, thereby oriented with a multi-objective approach to an integrated relationship of environment, economy, and society, as well as toward an urban of sustainable development.

Current Situation and Solutions for Methane (CH4) Emission in Paddy Rice Cultivation in Vietnam


 Abstract: Paddy rice production emits a significant amount of greenhouse gas, particularly methane (CH4). The purpose of this review is to assess the current status of CH4 emissions from paddy rice cultivation in Vietnam and propose solutions for reducing CH4 emissions. CH4 emissions from paddy rice cultivation account for 49.7 million tons of CO2eq (CO2 equivalent) per year in Vietnam. Soil texture, watering regime, and paddy cultivation technique are important in influencing CH4 emissions. Applications of advanced farming techniques such as the System of Rice Intensification (SRI), Alternate Wetting and Drying (AWD), and the use of biochar are among the recommended solutions. In summary, paddy rice production is the main source of CH4 emissions, which causes devastating effects on the global climate. Therefore, solutions that may both reduce GHG emissions and increase economic efficiency should be put into practice.
 
 

Fuel use intensity of hilsa fisheries in the lower Meghna river estuary of Bangladesh

Among the species caught by small-scale fisheries in Bangladesh, hilsa (Tenualosa ilisha) is the most important by volume and of great cultural importance. Hilsa fishing boats have over the last decade been mechanized, enabling longer trips and larger hauls. This development has, however, also resulted in increased fishing pressure and increased reliance on fossil fuels. This study estimates the fuel use intensity (FUI) of hilsa fishing, calculated as fuel per unit landed mass of hilsa at one of the main landing stations (Chairman ghat) in the coastal area of Noakhali district, Bangladesh. Primary data were collected from three types of artisanal fishing boats commonly used in hilsa fisheries, namely small boats (Choto/Khosa tempo), medium boats (Tempo), and large boats. Our results show a higher fuel use intensity in small boats (750 ± 468 l t-1), compared to medium (495 ± 270 l t-1) and large boats (576 ± 365 l t-1). Considering the gross catch and total fuel consumption of all boats, the absolute FUI is estimated at 463 l t-1. Thus, the FUI of hilsa fishing is slightly lower than the average for global fisheries FUI (489 l t-1). In terms of greenhouse gas (GHG), not including other lifecycle inputs (e.g. infrastructure, ice, supply chain etc.) than fuel (i.e. diesel, LPG, and wood), the average global warming impact is 1.72 ± 0.34 tonnes CO2-eq. t-1 overall catch. This study provides a baseline estimate for FUI and GHG emissions from contemporary hilsa fishing, and proposes solutions for addressing environmental issues and improving the overall performance of the sector.

Modeling the Impact of Fees and Circular Economy Options on the Financial Sustainability of the Solid Waste Management System in Jordan

Municipal solid waste services in Jordan are being provided by municipalities, where 90% of the generated solid waste finds its way to the landfills and dump sites. All Jordanian municipalities are suffering from low cost recovery where it reaches 50% in its best case. Realizing these facts, recently, the Jordanian government has embarked on an ambitious package of regulations and policies to promote the adoption of circular economy options. The National Solid Waste Management Strategy (NSWMS) of Jordan has called for rationalization, gradual increase of the service fees and adoption of circular economy options through recycling and composting. To assess the impacts of the proposed policies by the NSWMS on the financial sustainability, a system dynamic modeling (SDM) was carried out for the two largest municipalities in the country, namely Greater Amman Municipality (GAM) and Greater Irbid Municipality (GIM). The share of solid waste management cost from the total municipal budget in GAM and GIM is 13.3% and 24%, respectively. On the other hand, the cost per ton of solid waste management in GAM is USD 85 and in GIM it is USD 50. Medium-term and long-term scenarios were considered in the SDM analysis. By considering the year 2016 as a baseline year, the simulation revealed that during the midterm period (2022–2026), the cost recovery will be increased from 54% to 82.5% in GAM, while in GIM it will be raised from 45% to 70%. Moreover, during the long-term period (2027–2034) as a result of adopting circular economy options by recycling and composting, both GAM and GIM will achieve full cost recovery of the solid waste services, in 2028 and 2029, respectively. Furthermore, diverting the solid waste from the landfill will lead to climate change mitigation, where about 652,275 tons of CO2eq. and greenhouse gases will be avoided. It is recommended that municipalities in Jordan should consider a more efficient solid waste collection mechanism rather than through electricity bills. Further research is needed to assess the impact of other circular economy options such as waste to energy and extended producer responsibility (EPR).

Carbon efficiency analysis in the provision of drinking water: Estimation of optimal greenhouse gas emissions

Assessing carbon efficiency (CE) in the provision of drinking water services is essential to achieve a net-zero greenhouse gas (GHG) urban water cycle. Previous studies evaluating the CE of water companies are very scarce and employed parametric and non-parametric. Both methodological approaches present limitations such as overfitting issues or require assumptions about the production technology which could lead to less reliable efficiency scores. To overcome these limitations, in this study, and for the first time, we estimated CE of English and Welsh water companies using the Efficiency Analysis Trees (EAT) approach. This technique brings together machine learning and non-linear programming techniques to estimate production frontier and efficiency scores. It also allowed us to quantify the optimal level of GHG emissions in the provision of water services and estimate potential GHG savings. Bootstrap truncated regression methods were employed to quantify the impact of operating characteristics on CE of water companies. The optimal level of GHG emissions was estimated to be between 0.062 and 133.03 tons of CO2 equivalent (CO2eq) per year and per connected property. The average CE was at the level of 0.632. This means that GHG emissions could reduce by 36.8% to maintain the same level of water services. Equivalently, this corresponds to a reduction of 488,321 tons of CO2eq per year. Water only companies exhibited a better performance than water and sewerage companies with an average CE of 0.785 and 0.540, respectively. The performance of the English and Welsh water companies decreased over time. In 2011 the average CE was 0.772 whereas it went down to 0.534 in 2020. It was also estimated that on average water companies could reduce 0.034 tons of CO2eq per cubic meter of drinking water supplied and 16.16 tons of CO2eq/connected property per year. The regression results showed that topography and water treatment complexity had a significant impact on CE. The conclusions of this study are relevant for policy makers to define policies toward a low-carbon urban water cycle.

Techno-economic analysis of biofuel production from construction and demolition wood waste

ABSTRACT The increase in the amount of waste generated from construction and demolition (C&D) has raised concerns regarding landfill space and greenhouse gas emissions. One of the waste management practices that can remedy these issues is to convert the C&D wood waste into biofuel. The technical aspects, environmental benefits, and economic feasibility of such a practice may vary from one case to another and should be evaluated before implementation. In this study, techno-economic feasibility of establishing a biofuel production plant, which uses C&D wood waste delivered to the City of Vancouver (CoV)’s landfill in British Columbia, Canada is conducted. In addition, the GHG emission reduction of biofuel production compared with landfilling the C&D wood waste is investigated. According to the results, the average GHG emissions from landfilling all the waste is 24,350 tonnes of CO2 eq. while the emissions from biofuel production are 11,156 and 10,539 tonnes CO2 eq. for the biofuel production plant using diesel-based and electric-based equipment pieces, respectively. The GHG emission reductions are then monetized and included in the economic analysis. Results indicate that biofuel production is economically feasible only if the impacts of GHG emission reduction are considered. Moreover, sensitivity analysis and scenario analyses are performed on financial parameters, wood waste supply, biofuel demand, plant capacity, and plant ownership schemes. Based on these analyses, the biofuel selling price is the most impactful financial parameter on the outcome of economic feasibility. A 50% change in the biofuel selling price results in 42% and 45% change in NPV of the project for diesel-based and electric-based equipment, respectively. Furthermore, the ownership scheme, where CoV and a partner split the ownership and the partner operates the plant is the best option, with a net present value of more than $69 million.

Sustainable Conversion of Harmful Algae Biomass into a CO2 Reduction Electrocatalyst for Two-Fold Carbon Utilization.

Harmful algae blooms (HABs) frequently occur all over the world and cause great harm to the environment, human health, and aquatic ecosystems. However, owing to their great growth rate and large nutrient intake capacity, algae can enrich a large amount of carbon (CO2) and nutritional elements (N and P) in their biomass. Thus, this could be applied as a robust approach to battle global warming and water eutrophication if the harmful algae biomass was effectively harvested and utilized. Herein, we propose a thermochemical approach to convert algae biomass into a nitrogen-doped electrocatalyst for CO2 reduction. The as-synthesized carbon catalyst exhibits a favorable electrochemical CO2 reduction activity. The key drivers of the environmental impacts in the thermochemical conversion approach with a comparison with the commonly used landfilling approach are identified with life cycle assessment. The former presents much lower environmental burdens in terms of impacts such as freshwater/terrestrial ecotoxicity and human toxicity than the latter. Moreover, if the thermochemical conversion process was successfully applied for biomass conversion worldwide, 2.17 × 108 tons of CO2-eq, 8.42 × 106 tons of N, and 1.21 × 106 tons of P could be removed from the global carbon and other element cycles. Meanwhile, the thermochemical approach is also similar to landfilling in terms of costs. The results from this work provide a brand-new perspective for achieving twofold CO2 utilization and efficiently battling harmful algae blooms.

Assessment and Forecasting of Metallurgical Enterprises Carbon Footprint in the Sverdlovsk Region

The achievement of the targets of reducing greenhouse gas emissions is ensured, among other things, through direct price regulation measures, for the implementation of which a necessary condition is the calculation of the carbon footprint of products. At the same time, carbon footprint targets can be used as driving parameters to set industry targets for reducing greenhouse gas emissions, as well as to provide government support measures for enterprises. The aim of the work is to develop a methodological approach to the use of the «carbon footprint of products» indicator as a parameter for assessing the current and forecast values of greenhouse gas emissions from enterprises in industries that are subject to carbon regulation. The hypothesis of the study is to justify the use of target values of the indicator «carbon footprint of products» for strategic estimates of greenhouse gas emissions in the process of industrial decarbonization. For this purpose, the paper considers the organizational and economic mechanism of the European emissions trading system. A methodical approach to determining the carbon footprint of metallurgical products is described, and calculations of the carbon footprint of metallurgical enterprises in the Sverdlovsk region are performed. Calculations based on average indicators of the carbon intensity of products of Russian metallurgical enterprises showed that the total carbon footprint of the metallurgical sector of the Sverdlovsk region in 2021 is 21.8 million tons of CO2-eq; its target value may be 16.7 million tons of CO2-eq . Differences in values are due to the existing structure of manufactured products and applied technologies. The development of standard metrics for assessing greenhouse gas emissions at the enterprise level, regularly conducting such an assessment and its verification by an independent organization may constitute a preparatory stage that makes it possible to launch a mechanism for trading greenhouse gas emissions at the regional or country level. Additionally, the carbon footprint of products can act as a control parameter while establishing quantitative values for the volume of greenhouse gas emission reductions. The proposed methodological approach can be used by decision makers to shape regional decarbonization policies.

Urban transport energy demand model for Riyadh: methodology and a preliminary analysis

ABSTRACT Saudi Arabia intends to reduce GHG emissions by 278 million tons of CO2eq annually by 2030 through Nationally Determined Contribution (NDC) to UNFCCC. Among many policies, mass transit system and transit-oriented development are being developed with the expectation to reduce energy consumption and GHG emissions in Riyadh. To what extent such initiative can reduce energy consumption and GHG emission is an important question. In this paper, a methodology to systematically measure the impact of mass transit and transit-oriented development in Riyadh city on the energy demand has been developed. For Riyadh, a comprehensive travel demand model considering the impact of mass transit and transit-oriented development is still missing. To this end, this paper aims to fill the gap. This methodology considers the state-of-the-art in travel demand analysis and the local context by combining traditional four-step model and activity-based model for modal-shift. This paper describes the methodology and its application for Riyadh by analyzing modal-shift only between car and metro. The results suggest that metro can reduce energy consumption, but the reduction varies with varying accessibility, car, and metro situations. At high urban density and higher car travel cost, we may achieve as high as 13% reduction in fuel demand.