Harshita Mishra, K. Suresh Kumar, K. Pratibha, C. Periyasamy, P.V. Subba Rao IN: Ravishankar et al., Algae mediated Bioremediation: Industrial Prospectives, 2024, https://doi.org/10.1002/9783527843367.ch25
This chapter discusses the advantages of macroalgae as compared to the other sequestration methodologies.
Philipp Günther, Beatrice Garske, Katharine Heyl, Felix Ekardt IN: Environmental Sciences Europe 36, 72, https://doi.org/10.1186/s12302-024-00892-y
This article conducts a qualitative governance analysis of the European Commission’s 2022 proposal for a certification framework for carbon removals (CRCF). It highlights potential challenges and legal implications—with a specific focus on carbon farming.
Anna Havukainen, University of Helsinki, http://urn.fi/URN:NBN:fi:hulib-202404091663
The objective of this thesis was to identify the Negative Emission Technologies and Practices (NETPs) that yield the lowest social costs, thereby providing insights into which NETPs should be prioritized for investments in CDR. This evaluation was conducted by developing a Social Marginal Abatement Cost Curve (SMACC) framework, to examine the potentials and social costs of various NETPs.
Francis M. Mwaura, Margaret W. Ngigi, Gideon Obare IN: Scientific African 24, e02206, https://doi.org/10.1016/j.sciaf.2024.e02206
Despite consensus by the international community on the need for setting targets for reducing emissions or enhancing removal of greenhouse gases, comprehensive strategies for enumerating smallholders’ roles are yet to be designed and tested. Moreover, although smallholders’ role as net greenhouse gas removers has been speculated, evidence of this fact is necessary. A survey of 380 smallholders involved in maize-farming system in four sub-counties of western Kenya representing heterogeneity in agro-ecological zones and postulated biomass cooking energy access and demand was undertaken.
Tim Jesper Suhrhoff, Tom Reershemius, Jiuyuan Wang, Jacob S. Jordan, Christopher T. Reinhard, Noah J. Planavsky IN: Frontiers in Climate, https://doi.org/10.3389/fclim.2024.1346117
Enhanced weathering (EW) of silicate rocks spread onto managed lands as agricultural amendments is a promising carbon dioxide removal (CDR) approach. However, there is an obvious need for the development of tools for Measurement, Reporting, and Verification (MRV) before EW can be brought to scale. Shifts in the concentration of mobile elements measured in the solid phase of soils after application of EW feedstocks can potentially be used to track weathering and provide an estimate of the initial carbon dioxide removal of the system. To measure feedstock dissolution accurately it is necessary to control for the amount of feedstock originally present in the sample being analyzed. This can be achieved by measuring the concentration of immobile detrital elements in soil samples after feedstock addition.
podcast by Wil Burns & Anna Medlener (Institute for Carbon Removal Law & Policy, American University), 1h
In this episode Lennart Bach, at the Institute for Marine and Antarctic Studies, University of Tasmania, and Veronica Tamsitt, Head of Oceanography at the mCDR MRV company, Submarine, discuss some of the most pertinent issues to assessing the potential role of Ocean Iron Fertilization (OIF) in a marine CDR portfolio, including costs, risks, and legal considerations.
Vitor Gama, Beatriz Dantas, Oishi Sanyal, Fernando V. Lima IN: ACS Engineering Au, https://doi.org/10.1021/acsengineeringau.3c00069
This study investigates the feasibility of using membranes as direct air capture (DAC) technology to extract CO2 from atmospheric air to produce low-purity CO2. In this work, a two-stage hollow fiber membrane module process is designed and modeled using the AVEVA Process Simulation platform to produce a low-purity (≈5%) CO2 permeate stream. Such low-purity CO2 streams could have several possible applications such as algae growth, catalytic oxidation, and enhanced oil recovery. An operability analysis is performed by mapping a feasible range of input parameters, which include membrane surface area and membrane performance metrics, to an output set, which consists of CO2 purity, recovery, and net energy consumption.
Kelly A. Bona, Kara L. Webster, Dan K. Thompson, Oleksandra Hararuk, Gary Zhang, Werner A. Kurz IN: Ecological Modelling, 490, 110633, https://doi.org/10.1016/j.ecolmodel.2024.110633
This study applied the Canadian Model for Peatlands (CaMP) to 63.9 million hectares of peatlands within boreal and temperate ecozones of Canada to assess the trends in atmospheric carbon (C) emissions and removals and C sequestration over 30 years (1990–2019). While this research is the first to produce estimates of C sequestration and greenhouse gas emission and removal rates across such a large area of Canada, further research is required across peatland types and ecozones to improve parameterization, validation, and process representations. The results stress the importance of ecozone-specific analyses and accounting for infrequent large fire years and fire risk in land management policy and carbon accounting.
Rachel Silcox, Rohini Bala Chandran IN: Cell Reports Physical Science, 5, https://doi.org/10.1016/j.xcrp.2024.101884
A reversible pH-shifting seawater process uses hydrogen and redox salt to extract CO2, generating and consuming power during acidification and basification, respectively. An equivalent circuit model predicts performance dependent on key transport and thermodynamic parameters. The need to overcome mass-transport limitations, particularly liquid boundarylayer diffusion, is crucial for industrial current densities. Energy-intensity calculations indicate this process is competitive with prior oceanic CO2 removal processes and even with direct air capture, when pumping energy cost is eliminated.
Manon Abegg, Zeynep Clulow, Lucrezia Nava, David M. Reiner IN: Frontiers in Climate, doi:10.3389/fclim.2024.1331901
This study explores the future costs and scalability of DACCS and BECCS to advance net-zero goals. The authors analyze expert opinions on these technologies‘ potential costs and deployment scales for 2030, 2040, and 2050. Data was collected from 34 experts, comprising 21 DACCS and 13 BECCS specialists. They provided 90% confidence interval estimates and ‚best estimates‘ for future costs and deployment under two International Energy Agency (IEA) policy scenarios -Stated Policies (STEPS) and Net Zero Emissions by 2050 (NZE).
