Additional Ton Research Articles

Sustainable practices in steel manufacturing: Substitution elasticities between waste, raw materials, and energy for greenhouse gas emission reduction

This study investigates the potential of waste utilization to mitigate greenhouse gas (GHG) emissions within the steel manufacturing industry. Utilizing a translog production function, we analyze the substitution elasticities among scrap steel, iron ore, and energy, exploring their roles in carbon reduction. Our approach incorporates the Resource Efficiency and Climate Change Mitigation model to simulate the impact of various waste utilization strategies on GHG emissions. The findings highlight that scrap steel and iron ore exhibit substitution dynamics. Iron ore and energy exhibit complementary relationship, and there is also a complementary relationship between scrap steel and energy but with lower elasticity, indicating that increasing scrap steel usage can significantly reduce emissions while decreasing iron ore demand. Specifically, enhancing the input efficiency of scrap steel in secondary steel production can reduce GHG emissions by over 8.3 tons for each additional ton produced—surpassing the impact of merely increasing the volume of reused material, which offers a reduction of more than 2.2 tons per ton. The strategies centered on reduction and recycling demonstrate even lower GHG reduction efficiency. The findings advocate for governmental intervention to promote and support waste reuse initiatives, highlighting the potential environmental benefits and efficiency gains from such policies.

Scrap Steel Recycling: A Carbon Emission Reduction Index for China

Accurately assessing carbon emissions from recycling scrap steel is essential for reducing emissions in the steel industry, especially in China, the world’s largest crude steel producer. In this study, a carbon emission reduction index was introduced to evaluate the effectiveness of recycling scrap steel in reducing emissions. The index considers the three processes used in scrap steel recycling: blast furnace ironmaking, converter steelmaking, and electric arc furnace steelmaking. This study developed an evaluation model using fuzzy analytic hierarchy process and iterative cluster analysis to determine the reduction of carbon emission. From a life cycle perspective, this study identified primary factors contributing to emissions, including fuel, raw materials, electric energy, and auxiliary materials. Then, the carbon emission reduction index for scrap recycling was developed by examining the production of one ton of steel and each additional ton of scrap steel, which can provide valuable insights into the environmental impact of scrap recycling. Finally, the study forecasts the future Carbon Emission Reduction Index for steel scrap recycling. The study indicates an increase in the carbon emission reduction index for scrap recycling prior to 2017, followed by a decrease about 11.8% from 2017 to 2018 and increases from 2018 to 2021. Finally, it dropped by 8.7% per cent in 2022. Similarly, the carbon emission reduction index for electric furnace steelmaking increased prior to 2019, then subsequently decreased. It is changing by ten per cent a year. Additionally, the scrap recycling index experienced a significant decrease of 90% in 2015, followed by a gradual increase until 2017 and then a consistent decrease every year thereafter. The index suddenly rose in 2021 and then decreased change for policy reasons. The forecast results suggest a gradual increase in the carbon emission reduction index per ton of steel scrap in the future. In conclusion, the practicable modeling methodology has the ability to assist government organizations and private enterprises in devising efficient green and low-carbon development tactics.

Entomopathogenic nematodes as an effective and sustainable alternative to control the fall armyworm in Africa.

The recent invasion of the fall armyworm (FAW), a voracious pest, into Africa and Asia has resulted in unprecedented increases in insecticide applications, especially in maize cultivation. The health and environmental hazards posed by these chemicals have prompted a call for alternative control practices. Entomopathogenic nematodes are highly lethal to the FAWs, but their application aboveground has been challenging. In this study, we report on season-long field trials with an innocuous biodegradable gel made from carboxymethyl cellulose containing local nematodes that we specifically developed to target the FAW. In several Rwandan maize fields with distinct climatic conditions and natural infestation rates, we compared armyworm presence and damage in control plots and plots that were treated with either our nematode gel formulation, a commercial liquid nematode formulation, or the commonly used contact insecticide cypermethrin. The treatments were applied to the whorl of each plant, which was repeated three to four times, at 2-week intervals, starting when the plants were still seedlings. Although all three treatments reduced leaf damage, only the gel formulation decreased caterpillar infestation by about 50% and yielded an additional ton of maize per hectare compared with untreated plots. Importantly, we believe that the use of nematodes can be cost-effective, since we used nematode doses across the whole season that were at least 3-fold lower than their normal application against belowground pests. The overall results imply that precisely formulated and easy-to-apply nematodes can be a highly effective, affordable, and sustainable alternative to insecticides for FAW control.

Does the Capital Market Value Carbon Emission Reductions? Evidence from China

ABSTRACT: An increasing number of Chinese companies are strengthening their commitment to corporate social responsibility (CSR) by reporting their carbon emission reductions. Research suggests that such voluntary environmental disclosures can reduce information asymmetry, decrease the cost of capital, and thus enhance firm value. However, a significant research gap exists because this evidence mainly derives from developed countries, with limited consideration given to emerging countries, where the capital market often lacks robust informational content. To fill this research gap, we endeavor to explore the firm-value effects of the disclosures and the magnitude of carbon reduction in China, the largest emerging market. By manually collecting data on carbon emission reductions from the CSR reports of Chinese listed companies from 2008 to 2013, we employ the balance sheet valuation model and ordinary least squares regression to investigate the firm-value effects of the disclosures and the magnitude of carbon emission reductions. The empirical results show that firm value is positively associated with not only voluntary carbon emission reduction disclosures, but also the magnitude of carbon emission reductions. In our sample, for every additional ton of carbon emission reduction, firm value increases by approximately 340 yuan (equivalent to 44 euros or 52 US dollars). We also find that the firm-value effects of carbon emission reductions are more pronounced in high-pollution industries than those in low-pollution industries. Further channel tests reveal that on average, agency problems, as measured by selling, general, and administrative expenses, are lower in firms that disclose carbon emission reduction information than those that do not. In addition, firms with carbon emission reduction disclosures can obtain more green subsidies than those without such disclosures. To mitigate climate risk, firms should proactively engage in carbon emission reductions, which can potentially receive a positive recognition from the capital market. Our study also provides valuable insights for regulators in terms of establishing and enhancing carbon accounting standards to encourage corporate involvement in carbon reductions.

Potential for Carbon Credits from Conservation Management: Price and Potential for Multi-Habitat Nature-Based Carbon Sequestration in Dorset, UK

Carbon offsetting is currently a major tool in managing carbon emissions and informing sustainability plans of organisations in the drive to net-zero. This study aims to identify the offsetting potential of existing conservation schemes, and whether carbon offsetting credits could provide finance these conservation activities. The results from Dorset, in the UK, indicate that many existing conservation schemes in woodlands, heathlands, and grasslands cannot only enhance biodiversity but also capture significant amounts of carbon, and while habitats differ by region and country, the general results should be applicable elsewhere. We show that the cost per additional tonne of carbon sequestered as a result of conservation activities varies considerably between different conservation projects. On average, across the conservation projects we studied, the cost of this offsetting is GBP 80 per tonne CO2e sequestered and ranging between GBP 120 and GBP 0, depending on the project and whether existing biodiversity grants would be available. However, this figure was based on adapting and refining the existing conservation projects and did not involve expensive factors, such as purchase of land, which make the prices potentially unrealistic, especially in a Global North context. While the costs identified are higher than many offsetting schemes at present, it could present a useful option for those wishing to localise their offsetting. The concept is highly scalable and could remove significant amounts of carbon dioxide. Combining the approach with biodiversity credits or other credit schemes could make the higher costs more attractive to potential buyers.

The carbon footprint of the empty Castilla-La Mancha

In this paper, we analyze the carbon footprint of Castilla-La Mancha households, a region of the so-called “empty Spain,” and their mitigation potential. For this purpose, we use the environmentally extended multiregional input-output model and the Spanish Households Budget Survey to extract expenditure microdata by municipality size. We find that households in smaller municipalities have a larger total carbon footprint due to their higher direct emissions. Although their consumption is lower than other municipalities, they have a more intensive pattern of embedded carbon consumption. Households in smaller municipalities spend a higher share in private transport and housing-related activities, emitting almost an additional ton of direct carbon emissions.Regarding their mitigation potential, results show that for every euro that municipalities with less than 10,000 inhabitants reduce their consumption, they would reduce emissions by 0.796 kgCO2. However, while the size of the municipality increases, the mitigation potential decreases (0.378 kgCO2 for more than 100,000 inhabitants). This highest mitigation potential will only be achieved if mitigation policies especially favor their inhabitants and if infrastructures and social services are developed to facilitate a change in their consumption patterns.

Natural resource wealth in sub-Saharan Africa: A boon for public investment in renewable energy?

This paper examines the role of natural resource wealth in financing public investment in renewable energy in 25 sub-Saharan African countries over the period 1996 to 2019. Results from two step system Generalized Method of Moments (GMM) estimates reveal that natural resource wealth negatively affects public investment in renewable energy. A distinction between the types of natural resources allowed to establish that this negative effect comes exclusively from the rents of point natural resources. Furthermore, the results show that institutional quality and human capital favor public investment in renewable energy. These results are robust when using the Driscoll-Kraay estimator. In terms of policy implications, it is imperative to promote good governance of natural resource rents, especially those from point source resources. It will also be necessary to redirect these rents towards the financing of structuring projects such as renewable energies in order to promote sustainable development.

Loss of organic cattle to the conventional value chains in Ireland: what are the economic and environmental impacts?

PurposeThis paper aims to quantify the loss (or leakage) of organic cattle to conventional value chains in Ireland and assess its economic and environmental impacts.Design/methodology/approachThe paper adopts a Bio-economy Input-Output (BIO) model, a quantitative economic model representing the interdependencies between different sectors of the economy, to assess the economic and environmental impacts of organic leakage in the Irish beef sector.FindingsThe study reveals that 17% of organic cattle aged under 1 year old leave the organic value chain, leaking to the conventional market as a result of imbalances in the development of the beef value chain. The economic cost of this organic leakage is 5.66 million euros. Leakage also has environmental effects because of changes in lifecycle methane and nitrogen emissions based on longer finishing times on organic farms and chemical fertilisers applied on conventional farms. The organic leakage results in a reduction of 82 tons of methane emission and 52 additional tons of nitrogen emission, which leads to 11,484 tons of net global warming potential (GWP) for a 100-year time horizon.Research limitations/implicationsBecause of data availability, the research focussed on the baseline year 2015, which had national data available for disaggregation in Ireland. Therefore, researchers are encouraged to assess the economic and environmental impacts when more recent data are available and to analyse the change in the impacts over the years.Practical implicationsThis study contributes to the discussion on organic conversion and provides valuable insights for stakeholders, especially policymakers, for the design of future organic schemes.Originality/valueThis is the first paper to assess organic leakage in the beef sector.

Greenlandic glacial rock flour improves crop yield in organic agricultural production

The application of mechanically crushed silicate minerals to agricultural soils has been proposed as a method for both improving crop yields and sequestering inorganic carbon through enhanced mineral weathering. In Greenland, large quantities of finely grained glacial rock flour (GRF) are naturally produced by glacial erosion of bedrock and deposited in easily accessible lacustrine and marine deposits, without the need for energy-intensive grinding. To determine if this material can improve crop yields, we applied 10 and 50 t GRF ha−1 to a sandy, organic agricultural field in Denmark. Two field trials were carried out to test the first-year yield response to GRF in both maize and potatoes, residual effects on potato yields in the year after application, and second and third-year residual effects on spring wheat. Reference-K treatments were included for comparison to determine if the beneficial effects of GRF were primarily due to its K content (3.5% K2O). This alternative source of silicate minerals improved crop yields in the year of application. Though there was no improvement in yield with the reference-K treatments, for each additional ton of GRF applied, maize dry yield increased by 59 kg ha−1 and potato tuber yield by an additional 90 kg ha−1. No residual effects on crop yields were observed in the following years, but we suspect that benefits might persist over multiple seasons at sites with lower initial fertility. The increase in yields achieved with GRF could offset some of the costs of applying silicate minerals as a CO2 sequestration scheme.

Social cost of carbon under a carbon-neutral pathway

Climate change is the challenge of the century, and achieving the goals of the Paris Agreement will require worldwide cooperation and mutual effort. Over 120 countries have made their net-zero commitments, and quantifying the social cost of carbon (SCC), i.e. the climate damage caused by an additional ton of CO2 emissions, under a carbon-neutral pathway would provide a carbon price benchmark for policymakers. Here, we set in detail the emission trajectories of different jurisdictions under a carbon-neutral pathway based on the submitted nationally determined contributions. We then assess global and regional warming, climate change damages, and the SCC with the Policy Analysis of Greenhouse Effect integrated assessment model. We find a peak warming of about 2.1 °C relatives to pre-industrial levels in this century under our carbon-neutral emission pathway. And even if all countries meet their carbon-neutral commitments, this would not be sufficient to limit global warming to 1.5 °C relative to pre-industrial levels. We compare the SCC using fixed discount rates, dynamic discounting, and an equity weighting approach. Notably, the introduction of equity weights would increase the estimated SCC from 79 (11–186) to 291 (83–592) US$ per tCO2. Climate change damages will be borne primarily by warmer and poorer countries, and this profound inequality would likely undermine efforts to eradicate extreme poverty. Statistics on current carbon taxes and carbon trading prices show that they are notably lower than global or even regional SCCs, suggesting that the current system does not adequately reflect the global externalities of CO2 emissions. More studies are needed to assess the equity aspects of climate change impacts, to help refine mechanisms to align domestic interests with global interests, and to facilitate the implementation of national carbon-neutral commitments in place.

Valuing the Global Mortality Consequences of Climate Change Accounting for Adaptation Costs and Benefits

AbstractUsing 40 countries’ subnational data, we estimate age-specific mortality-temperature relationships and extrapolate them to countries without data today and into a future with climate change. We uncover a U-shaped relationship where extre6me cold and hot temperatures increase mortality rates, especially for the elderly. Critically, this relationship is flattened by higher incomes and adaptation to local climate. Using a revealed-preference approach to recover unobserved adaptation costs, we estimate that the mean global increase in mortality risk due to climate change, accounting for adaptation benefits and costs, is valued at roughly 3.2% of global GDP in 2100 under a high-emissions scenario. Notably, today’s cold locations are projected to benefit, while today’s poor and hot locations have large projected damages. Finally, our central estimates indicate that the release of an additional ton of CO2 today will cause mortality-related damages of $36.6 under a high-emissions scenario, with an interquartile range accounting for both econometric and climate uncertainty of [−$7.8, $73.0]. These empirically grounded estimates exceed the previous literature’s estimates by an order of magnitude.

Continuous Cover Forestry and Cost of Carbon Abatement on Mineral Soils and Peatlands

Continuous cover forestry (CCF) has proven to financially outperform rotation forestry (RF) with low or even moderate social price of carbon in mineral soils. However, to date there are no studies to compare financial performance of joint production (timber and carbon sequestration) between mineral soils and peatlands when CCF is applied. A vast variety of harvest intervals and intensity (expressed as post-harvest basal area) for a mature spruce-dominated [Picea abies (L.) Karst.] stand on both mineral and peat soils was simulated with process-based ecosystem model, EFIMOD. In addition, four levels of carbon price (0, 25, 50 and 75€/tCO2) were applied in assessing the profitability of joint production (timber and carbon sequestration) associated with CCF. Mineral soil turned out to be superior to peatland in cost-efficiency of carbon sequestration. For instance, the cost of additional ton of CO2 was only €2/tCO2 with a carbon price of €25/tCO2 for a private forest owner (through carbon trading), while on peatland it fluctuated between €30 and €39.5/tCO2, depending on the carbon price applied for a private forest owner (€25-€75/tCO2). In general, mineral soil was more sensitive to harvest interval and intensity than peatland, with respect to cost-efficiency in climate change mitigation.

The social cost of carbon dioxide under climate-economy feedbacks and temperature variability

A key statistic describing climate change impacts is the ‘social cost of carbon dioxide’ (SCCO2), the projected cost to society of releasing an additional tonne of CO2. Cost-benefit integrated assessment models that estimate the SCCO2 lack robust representations of climate feedbacks, economy feedbacks, and climate extremes. We compare the PAGE-ICE model with the decade older PAGE09 and find that PAGE-ICE yields SCCO2 values about two times higher, because of its climate and economic updates. Climate feedbacks only account for a relatively minor increase compared to other updates. Extending PAGE-ICE with economy feedbacks demonstrates a manifold increase in the SCCO2 resulting from an empirically derived estimate of partially persistent economic damages. Both the economy feedbacks and other increases since PAGE09 are almost entirely due to higher damages in the Global South. Including an estimate of interannual temperature variability increases the width of the SCCO2 distribution, with particularly strong effects in the tails and a slight increase in the mean SCCO2. Our results highlight the large impacts of climate change if future adaptation does not exceed historical trends. Robust quantification of climate-economy feedbacks and climate extremes are demonstrated to be essential for estimating the SCCO2 and its uncertainty.

Solely economic mitigation strategy suggests upward revision of nationally determined contributions

Solely economic mitigation strategy suggests upward revision of nationally determined contributions

Assessing the Economic Structure, Climate Change and Decarbonisation in Europe

Anthropogenic greenhouse gas (GHG) emissions coming mainly from fossil fuel combustion for energy use are causing air temperature increases resulting in climate change. This study employs an environmentally extended input–output model to conduct an economy-wide assessment of GHG emissions in the European Union (EU). Model results indicate that the assumed growth of economic activity by 2030 will lead to a large increase in GHG emissions by 89%, assuming no technological change and no additional policy mitigation efforts. The electricity sector and agriculture create the highest direct and indirect GHG emissions per unit of economic output across the 27 EU member states (EU-27); for every 1-million-euro-increase in the final demand for the products and services of the electricity sector and agriculture, 2198 and 1410 additional tons of GHG emit, respectively. Regional climate projections under a low-decarbonisation pathway (RCP8.5), in accordance with our economic analysis, indicate a further increase of regional warming, combined with pronounced changes in the hydrological cycle. Contrariwise, following a strong mitigation pathway (RCP2.6) will result in warming levels lower than 1.5 °C with respect to the 1986–2005 reference period. Our findings reveal the importance of both direct and indirect contribution of economic sectors in the generation of GHG emissions, taking into consideration the size of the sectors and the assumed growth rates. The design and implementation of sectoral emission reduction policies from the perspective of the whole production supply chain can effectively contribute to GHG emission reduction commitments.

CO2 Reduction Measures in the Aviation Industry: Current Measures and Outlook

This article gives a holistic overview of the current CO2 reduction measures and analyses the effectiveness of measures that are feasible for implementation in the future. To achieve the objectives of the Paris Agreement, the aviation industry needs to implement reduction measures because of its forecasted growth and contribution to global warming. The focus is set on CO2 reduction measures, categorized in technology, operations, infrastructure/air traffic management (ATM), and market-based measures. The most promising long-term technologies to reduce CO2 emissions are hydrogen-powered aircrafts and sustainable aviation fuels (SAF). In terms of operations, CO2 emissions can be reduced through weight savings, either from fuel or payload. For every additional ton on board of an aircraft, an extra 3%–25% of fuel is necessary, depending on the route distance. From an infrastructure/ATM perspective, the goal is to decrease flight times and avoid holdings because every kg of fuel burned produces 3.16 kg of CO2 emissions. Market-based measures have a low impact as a reduction measure, but revenues may be used to accelerate the research and development of more promising reduction measures. The implementation of just one reduction measure is not reasonable. A global approach with reasonable incentives to support CO2 reduction measures is preferable.

The value relevance of reported carbon emissions

In 2004, Canada’s Greenhouse Gas (GHG) Reporting Program made carbon emissions disclosure mandatory for Canadian facilities emitting 100 kilotonnes or more. Three industrial sectors are responsible for most of Canada’s GHG emissions: oil and gas, transportation and electricity. This study sheds light on the role of industrial sector polluting levels and the influence of firms’ environment or sustainable development committee on the market valuation of their reported carbon emissions. We used a modified version of Ohlson’s model to examine the value relevance of carbon emissions disclosure for the program’s entire reporting period, running from 2004 to 2017, the last available year. Our results show a negative association between GHG emissions and firm value. Investors use the total level of GHG emissions to assess future environmental liabilities, and industrial sector polluting level moderates the negative association between these emissions and firm value. For every additional tonne of GHG emissions, low-polluting firms saw their market value drop by $548 and high-GHG emitting firms by $35. Our results provide evidence of a more prominent negative relationship between GHG emissions and firm value for firms operating in low-GHG emitting industrial sectors, indicating higher penalties from stock market participants for these firms. Our findings suggest that stock market participants draw on distinct institutional logics: the dominant economic logic, favoured by investors interested in high-GHG emitting firms, versus an alternative social and environmental logic, used by those interested in low-GHG emitting firms. Moreover, companies with an environment or sustainable development committee have, on average, higher levels of GHG emissions than companies with no similar committee. The market value of companies with such committee decreases by $518 for every additional tonne of GHG emissions. Companies with no such committee record no effect of GHG emissions on their market values.

Land transport CO2 emissions and climate change: evidence from Cyprus

ABSTRACTThe land transport sector is one of the major emitters of CO2 and one of the hardest sectors to decarbonise. This study employs an environmentally-extended input-output model to conduct an economy-wide assessment of CO2 emissions in Cyprus, associated with a 22% increase in the final demand for the output of the sector by 2030. Model results indicate that the land transport sector creates the third highest (direct and indirect) CO2 emissions within Cyprus economy; for every 1 million euro increase in the final demand of the sector’s services and products, 407 additional tons of CO2 are emitted. Considering that temperature in Cyprus is projected to increase by up to 4.5–5°C by the end of the century, our findings highlight the importance of the land transport sector in the transition of Cyprus to a low-carbon economy and the urgency of implementing in-sector cost-effective decarbonisation strategies.

Mitigation of greenhouse gas emissions using exergy

Carbon mitigation options have been measured neglecting the role that fossil fuels play as energy sources. For instance, producing wood or storing carbon would not have a cyclical effect on energy supply. This study suggests an approach to measure the carbon offset of biofuels, regarding the concept of exergy on carbon mitigation and the area required to provide the equivalent amount of exergy from fossil fuels. Sugarcane and eucalyptus were considered as mitigation alternatives within five distinct scenarios for biofuel production in a broad technological range. All scenarios were compared with four fossil fuels: diesel oil, pure gasoline, and two gasoline-ethanol blends. In general, sugarcane presented smaller specific exergy, but higher exergy output than eucalyptus, on average for all scenarios, mainly due to its higher yearly crop yield. On average, both crops require from 20% to 30% more area to synthesize the same amount of exergy than the required area to mitigate the mass of carbon dioxide emitted from commercial fuels. Higher efficiency can be reached with higher crop yields, such as collecting remaining biomass after harvest rather than leaving it in the field. Another option is to reduce moisture content on solid fuels, such as wood and straw. On average, each Mg ha −1 increased in yield would result in an additional output of 4.5 GJ ha −1 . Besides, for each percentage of moisture content reduced in solid fuels, there would be an increase of exergy output of 1 GJ ha −1 . • Sugarcane has less specific exergy than Eucalyptus, but higher exergy output. • Biofuels needs 20–30% more area to mitigate exergy than carbon from fossil fuels. • On average, each additional ton of yield increases exergy output by 4.5 GJ ha −1 . • Reducing 1% of moisture in solid biofuels raises exergy output by about 1 GJ ha −1 .

Valuing the Global Mortality Consequences of Climate Change Accounting for Adaptation Costs and Benefits

Using 40 countries’ subnational data, we estimate age-specific mortality-temperature relationships and extrapolate them to countries without data today and into a future with climate change. We uncover a U-shaped relationship where extreme cold and hot temperatures increase mortality rates, especially for the elderly. Critically, this relationship is flattened by both higher incomes and adaptation to local climate. Using a revealed preference approach to recover unobserved adaptation costs, we estimate that the mean global increase in mortality risk due to climate change, accounting for adaptation benefits and costs, is valued at roughly 3.2% of global GDP in 2100 under a high emissions scenario. Notably, today’s cold locations are projected to benefit, while today’s poor and hot locations have large projected damages. Finally, our central estimates indicate that the release of an additional ton of CO2 today will cause mortality-related damages of $36.6 under a high emissions scenario and using a 2% discount rate, with an interquartile range accounting for both econometric and climate uncertainty of [-$7.8, $73.0]. Under a moderate emissions scenario, these damages are valued at $17.1 [-$24.7, $53.6]. These empirically grounded estimates exceed the previous literature’s estimates by an order of magnitude.