CO₂-removal News

Dupla et al. (2024): Assessing the biogeochemical impacts of terrestrial enhanced rock weathering on soil fertility

Xavier Dupla, Romane Claustre, Emma Bonvin, Iris Graf, Claire Le Bayon, Stéphanie Grand IN:  EGU General Assembly 2024, https://doi.org/10.5194/egusphere-egu24-20481

This field trial assessed the impact of ERW on biological, physical, and geochemical dimensions of soil fertility. Overall, basalt addition had a predominantly positive to neutral effect on soil fertility. The majority of soil properties showed no significant change either 1 month or 1 year post basalt application. Nevertheless, our study highlighted a significant increase in earthworm biomass, soil respiration and sodium concentration as early as 1 month post application. These changes, suggestive of rapid initial weathering processes, require further investigation before enhanced rock weathering can be considered a viable and secure carbon dioxide removal technology.

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Qiu et al. (2024): The role and deployment timing of direct air capture in Saudi Arabia’s net-zero transition

Yang Qiu, Gokul C Iyer, Jay Fuhrman, Mohamad I. Hejazi, Puneet Kamboj, Page Kyle IN: Environmental Research Letters, DOI: 10.1088/1748-9326/ad4a8f

The Kingdom of Saudi Arabia (KSA) has pledged to achieve net-zero greenhouse gas (GHG) emissions by 2060. Direct air carbon capture and storage (DACCS) is critical for the country to meet its net-zero target given its reliance on fossil fuels and limited options for carbon dioxide removal (CDR). However, the role of DACCS in KSA’s national climate change mitigation has not been studied in the literature. In this study, we aim to understand the potential role of DACCS and the effect of its deployment timing in KSA’s transition toward its net-zero target using GCAM-KSA, which is a version of Global Change Analysis Model (GCAM) with KSA split out as an individual region. 

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Galán-Martín et al. (2024): Carbon-negative products to engage society in climate action: The life cycle of olive oil

Ángel Galán-Martín, María del Mar Contreras, Eulogio Castro IN: Sustainable Production and Consumption, 47, https://doi.org/10.1016/j.spc.2024.04.025

The study explores a novel approach that integrates bioenergy with carbon capture and storage (BECCS) into olive oil production. Employing Life Cycle Assessment, the authors assess the potential for carbon-negative olive oil production and its broader environmental implications. The findings demonstrate that producing carbon-negative virgin olive oil is possible by powering the olive mill processes with BECCS based on olive prunings generated at the agricultural stage (up to −0.32 kg CO2eq per 1-l bottle of virgin olive oil).

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Niron et al. (2024): Exploring the Synergy of Enhanced Weathering and Rhizobacteria in Sustainable Agriculture

Harun Niron, Laura Steinwidder, Jet Rijnders, Lucilla Boito, Sara Vicca IN: EGU General Assembly 2024, https://doi.org/10.5194/egusphere-egu24-16303

In a maize mesocosm experiment combining B. subtilis, basalt, and water content as variables, the authors observed a significant impact of B. subtilis on plant biomass in treatments, while basalt showed no major effect. In treatments with reduced irrigation, plants that were amended with basalt and B. subtilis displayed elevated leaf chlorophyll levels and improved nitrogen balance compared to plants that were not amended with B. subtilis. Across both high and low watering conditions, plants amended with basalt and B. subtilis exhibited enhanced photosynthetic activity and improved stomatal regulation. These findings suggest a promising added effect of PGPR B. subtilis to basalt-based EW for efficient crop health management under varying environmental conditions. This synergy has the potential to address the challenge of variable carbon sequestration efficiency and can provide a robust basis for improving crop health under diverse settings.

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Victoria et al. (2024): Engineering highly productive cyanobacteria towards carbon negative emissions technologies

Angelo J Victoria, Michael J Astbury, Alistair J McCormick IN: Current Opinion in Biotechnology, 87, 103141, https://doi.org/10.1016/j.copbio.2024.103141

Cyanobacteria are a diverse and ecologically important group of photosynthetic prokaryotes that contribute significantly to the global carbon cycle through the capture of CO2 as biomass. Cyanobacterial biotechnology could play a key role in a sustainable bioeconomy through negative emissions technologies (NETs), such as carbon sequestration or bioproduction. However, the primary issues of low productivities and high infrastructure costs currently limit the commercialisation of such applications. The isolation of several fast-growing strains and recent advancements in molecular biology tools now offer promising new avenues for improving yields, including metabolic engineering approaches guided by high-throughput screening and metabolic models. Furthermore, emerging research on engineering coculture communities could help to develop more robust culturing systems to support broader NET applications.

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Policy Brief: Build Carbon Removal Reserve to Secure Future of EU Emissions Trading

by Wilfried Rickels, Mathias Fridahl, Roland Rothenstein, Felix Schenuit, Kiel Institute for the World Economy, May 2024

Transforming an existing ETS that covers gross emissions into a net-emissions system that covers both emissions and removals and introducing a net-zero cap followed by a net-negative cap, poses the challenges of ensuring that the market remains operational and that the policy objectives underlying the ETS are maintained during the transition period. The EU faces this dual challenge. Delpla and Gollier (2019), Rickels, Proelß, et al. (2021), Rickels, Rothenstein, et al. (2022), and Edenhofer et al. (2024) propose introducing a Carbon Central Bank (CCB) to manage the inclusion of CRC trading and the transformation of the existing EU ETS into a net-zero and then net-negative ETS.

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Webinar: Scrubbing the Skies – Sustainable Financing of Negative Emissions with a CO2 Emitter Liability

March 23, 7-8 pm CEST, hosted by the Institute for Responsible Carbon Removal

In this webinar the concept of Atmospheric CO2 Removal Deposits (ACORDs) is discussed with Professor Anders Lyngfeldt of the Chalmers University of Technology in Göteborg. Anyone that emits fossil CO2 to the atmosphere would be obliged to finance the removal of at least as much CO2 from the atmosphere. Linking the liability to ACORDs acknowledges that a major part of the negative emissions needs to be made in the future. The emitters’ financial deposits, including earnings, could be redeemed upon certified proof of removal. The ACORDs system would comply with the widely accepted principle of producer liability, i.e., that companies are responsible for the damage caused by their products. The system would also provide additional incentives to reduce emissions and an innovative funding source for coming generations to accomplish negative emissions.

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Gross et al. (2024): Long-term biochar and soil organic carbon stability – evidence from long-term field experiments in Germany

Arthur Gross, Tobias Bromm, Steven Polifka, Daniel Fischer, Bruno Glaser IN: EGU General Assembly 2024, https://doi.org/10.5194/egusphere-egu24-9944

This study proves that SOC sequestration through the use of biochar amendments is possible. However, it seems to depend on soil and biochar properties such as soil texture whether SOC stocks are stable in the long-term and dissipation can be mitigated, with the loamy soil seemingly offering better sequestration conditions. As considerable biochar dissipation was observed in both soils, further studies need to investigate whether the dissipation is due to lateral and/or vertical particle transport or microbial decomposition. This is an important question for the suitability of biochar as a reliable CO2 removal technology.

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Salas et al. (2024): Life cycle assessment of bioenergy with carbon capture and storage: A review

D. A. Salas, A. J. Boero, A. D. Ramirez IN: Renewable and Sustainable Energy Reviews 199, 114458, https://doi.org/10.1016/j.rser.2024.114458

This research aims to explore the current evidence on the sustainability of Bioenergy with Carbon Capture and Storage under a life cycle approach and to understand how research on this topic has evolved in the last decade. A systematic literature review was performed, and the main focus was identifying methodological shortcomings and analysing Global Warming Potential results. Forty-seven studies were selected for in-depth revision.

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