CO₂-removal News

Victor & Nichols (2024): Impact of carbon dioxide removal technologies on deep decarbonization: EMF37 MARKAL–NETL modeling results

Nadejda Victor, Christopher Nichols IN: Energy and Climate Change 5, 100143, https://doi.org/10.1016/j.egycc.2024.100143

This paper examines the MARKAL-NETL modeling results for the Energy Modeling Forum study on Deep Decarbonization and High Electrification Scenarios for North America (EMF 37) with a specific focus on carbon dioxide removal technologies and opportunities under different scenario guidelines, policies, and technological advancements.

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Manning et al. (2024): Soil carbon management and enhanced rock weathering: The separate fates of organic and inorganic carbon

David A. C. Manning, Antonio Carlos de Azevedo, Caio F. Zani, Arlete S. Barneze IN: European Journal of Soil Science 75 (4), e13534, https://doi.org/10.1111/ejss.13534

Soil carbon management has been promoted as one of the few readily available strategies to mitigate the rising concentration of atmospheric CO2 and its associated impacts on climate change. One of these carbon management strategies is enhanced rock weathering which involves adding crushed silicate rocks to the soil. The approach requires careful interpretation of the differences between soil organic carbon (SOC) and soil inorganic carbon (SIC) and their measurement, with implications for land management and C credit accounting. In this Opinion, the authors emphasise the distinct nature and fates of SOC and SIC, advocating for their separate management, particularly in C credit schemes.

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Fam & Fam (2024): Review of the US 2050 long term strategy to reach net zero carbon emissions

Adam Fam, Sami Fam IN: Energy Reports 12, 845-860, https://doi.org/10.1016/j.egyr.2024.06.031

This review article condenses the multitude of technical and policy issues facing the US long-term strategythat lays out the pathway to reach the Paris Agreement goals, providing readers with an overview of the extent and magnitude of the challenges while outlining possible solutions.

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Ampah et al. (2024): Carbon dioxide removal and net zero emissions in Africa: an integrated assessment modelling based on three different land-based negative emission solutions

Jeffrey Dankwa Ampah, Sandylove Afrane, Humphrey Adun, Michael O Dioha, Ephraim Bonah Agyekum, Abdulfatah Abdu Yusuf, Mudassar Naseer, Olusola Bamisile IN: Environmental Research Letters 19 (8), 084021, https://doi.org/10.1088/1748-9326/ad5dcf

As the remaining carbon budget for limiting warming to 1.5 °C rapidly diminishes, it is clear that, besides decarbonization, the world will need to remove 100–1000 GtCO2 from the atmosphere by the end of the century. Yet, Africa, where many carbon removal schemes are planned, remains a ‚blindspot‘ in existing studies. There is limited understanding of the trade-offs and synergies associated with carbon removal within Africa’s energy-land-water system. To address this research gap, a stylized net-zero emissions in Africa by 2050 was modeled, with focus on three land-based biological carbon removal approaches: afforestation/reforestation, bioenergy with carbon capture and storage, and biochar.

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Nature – Ganti et al. (2024): Evaluating the near- and long-term role of carbon dioxide removal in meeting global climate objectives

Gaurav Ganti, Thomas Gasser, Mai Bui, Oliver Geden, William F. Lamb, Jan C. Minx, Carl-Friedrich Schleussner, Matthew J. Gidden IN: Communications Earth & Environment 5, 377, https://doi.org/10.1038/s43247-024-01527-z

The 6th Assessment Report from the Intergovernmental Panel on Climate Change lacked sufficient land-sector scenario information to estimate total carbon dioxide removal deployment. Here, using a dataset of land-based carbon dioxide removal based on the scenarios assessed by the Intergovernmental Panel on Climate Change, the authors show that removals via afforestation and reforestation play a critical near-term role in mitigation, accounting for around 10% (median) of the net greenhouse gas emission reductions between 2020 and 2030 in scenarios that limit warming to 1.5 °C with limited overshoot. The authors explore the regional distributions of gross emissions and total carbon dioxide removal in cost-effective mitigation pathways and highlight the importance of incorporating fairness and broader sustainability considerations in future assessments of mitigation pathways with carbon dioxide removal.

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Rinberg & Aziz (2024): Bicarbonate-Carbonate Selectivity through Nanofiltration for Direct Air Capture of Carbon Dioxide

Anatoly Rinberg, Michael J. Aziz IN: ACS ES&T Engineering, https://doi.org/10.1021/acsestengg.4c00150

Direct air capture of carbon dioxide is one approach among many proposed that is capable of offsetting hard-to-avoid emissions. In previous work, we developed the alkalinity concentration swing (ACS) method, which is driven through concentrating an alkaline solution that has been loaded with atmospheric CO2 by desalination technologies, such as reverse osmosis or capacitive deionization. Though the ACS is promising in terms of energy usage and implementation, its absorption rate and water requirements are infeasible for a large-scale DAC process. Here, we propose an improvement on the ACS, the bicarbonate-enriched alkalinity concentration swing (BE-ACS), which selects bicarbonate ions from a stream of aqueous alkaline solution that has absorbed atmospheric CO2

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Nature – Ottenbros et al. (2024): Prospective environmental burdens and benefits of fast-swing direct air carbon capture and storage

Anne B. Ottenbros, Rosalie van Zelm, Jasper Simons, Mitchell K. van der Hulst, Kiane de Kleijne, Hans de Neve, Mark A. J. Huijbregts IN: Scientific Reports 14, 16549, https://doi.org/10.1038/s41598-024-66990-2

This study investigates the environmental impact of a new fast-swing solid sorbent DAC system, including CO2 transport and storage, over its life cycle, using prospective life cycle assessment.

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Fink & Ratter (2024): Blurring societal acceptance by lack of knowledge—insights from a German coastal population study on blue carbon

Michael Fink, Beate Ratter IN: Frontiers in Climate, 6, https://doi.org/10.3389/fclim.2024.1283712

Blue carbon ecosystems are under anthropogenic pressure and, to help these ecosystems to thrive and realize their carbon storage potentials, interventions require acceptance from society, in general, and adjacent coastal communities, in particular. Through a random street survey along the German coasts in 2022, quantitative and qualitative data were collected from more than 200 participants. A questionnaire comprising 50 open and closed questions was designed to assess the status quo of German coastal residents’ norms and values concerning blue carbon ecosystems. Focus was put on nature conservation and climate change perceptions.

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Norton et al. (2024): Storage capacity estimates and site conditions of potential locations for offshore-wind powered carbon dioxide removal and carbon sequestration in ocean basalt

Heather Norton, Devin Todd, Curran Crawford IN: Carbon Capture Science & Technology, 13, https://doi.org/10.1016/j.ccst.2024.100231

This paper seeks to identify locations where offshore wind and potential basalt storage locations exist within close proximity to one another around the globe. Offshore regions with mean wind speed greater than 8 m/s were identified. Offshore regions with basalt aquifers along seismic or aseismic ridges which provide potential CO2 storage sites were identified and selected based on sediment thickness, age, and distance from plate boundaries. Four scenarios were constructed to capture a range of constraints with implications for technical, economic and regulatory difficulties.

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Hung et al. (2024): Assessing CO2 sources and sinks in and around Taiwan: Implication for achieving regional carbon neutrality by 2050

Chin-Chang Hung, Hsueh-Han Hsieh, Wen-Chen Chou, En-Chi Liu, Chun Hoe Chow, Yi Chang, Tse-Min Lee, Peter Hans Santschi, R.R.M.K.P. Ranatunga, Hernando P. Bacosa, Yung-Yen Shih IN: Marine Pollution Bulletin, 206, https://doi.org/10.1016/j.marpolbul.2024.116664

This study aims to first review the existing nature-based carbon sinks on land and in the oceans around Taiwan. Subsequently, the authors suggest potential strategies to reduce CO2 emissions and propose carbon dioxide removal methods (CDRs).

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