 | | | | Links to recent scientific papers, web posts, upcoming events, job opportunities, podcasts, and event recordings, etc. on Carbon Dioxide Removal TechnologySubscribe to stay informed on carbon dioxide removal tech and support our independent reporting through a paid subscription.Donate < $10 Get 20% off a group subscription TABLE OF CONTENTSNote: Click on the headings listed in the table of contents above to easily navigate to the sections you’re interested in.RESEARCH PAPERSAuthors: Ulf Büntgen, Clive Oppenheimer, Mirek Trnka, et al.Synopsis: The scalability of many proposed CO₂ removal methods remains uncertain. This study introduces a novel concept inspired by natural processes: sinking timber from boreal forests to the deep Arctic Ocean for long-term carbon sequestration. Drawing on evidence from driftwood dynamics, accelerating sea-ice loss, enhanced tree growth under warming, and the long-term stability of cellulose in cold, anoxic conditions, the authors argue that deep Arctic burial of timber could represent a durable, nature-based pathway for CO₂ removal.
Authors: Sarah Nurdeen Asad Ahmed Tamer Fahad Lin Jaco GonzalezSynopsis: As carbon capture shifts from pilot projects to integrated, multi-sector deployment, scale-up remains limited by material performance, regeneration energy, and infrastructure constraints. This review compares post-combustion, pre-combustion, oxy-fuel, and direct air capture pathways, assessing adsorption, absorption, membranes, and cryogenic methods under realistic conditions. It links material benchmarks to process intensification and system integration strategies, showing how shared infrastructure, low-grade heat use, and standardised testing can improve feasibility and guide carbon capture deployment over the next decade.
Authors: Kira A. Krumhansl, Melisa C. Wong, Manon M. M. Picard, et al.Synopsis: Carbon sequestration by coastal vegetated ecosystems is highly uncertain due to limited measurements and incomplete accounting of carbon pathways. Combining empirical data and modeling, this study develops detailed carbon budgets for kelp forests and eelgrass meadows in Nova Scotia. Results show that dissolved organic carbon release and export dominate sequestration - far more than global estimates suggest. Kelp forests sequester ~1.3 orders of magnitude more carbon than eelgrass, largely due to their extensive area, underscoring their overlooked importance in blue carbon strategies.
Authors: Edward Idun Amoah, Peter McCloskey, Rimnoma Serge Ouedraogo, et al.Synopsis: Nature-based climate solutions like agroforestry can deliver carbon sequestration and co-benefits, but limited, low-cost MRV systems restrict smallholder participation in carbon markets. This study introduces the DiameterAlgorithm, a non-contact tree diameter estimation method using semantic segmentation and 2D photogrammetry. Tested in Kenya and the United States, it achieved high accuracy (mIoU = 0.937, R² = 0.97) with low error and minimal bias. Combined with allometric equations, the approach enables scalable, site-level biomass and carbon estimation.
Authors: Hanna van de Mortel, Nina Bednaršek, Greg Pelletier, Richard A. Feely, Jens D. Müller, Nicolas GruberSynopsis: Ocean Alkalinity Enhancement (OAE) is a promising marine carbon dioxide removal strategy with potential to mitigate ocean acidification, but its biological benefits are limited. This study evaluates 27 marine calcifiers, showing preindustrial-to-present calcification declines of 3–44%. Adding 50 μmol kg⁻¹ alkalinity restores calcification by up to 52% in sensitive species, but full restoration requires much larger doses. Higher CO₂ removal efficiency can reduce biological benefits, highlighting trade-offs between climate mitigation and marine ecosystem recovery.
Authors: Joaquín Romero Vásquez, Vafa Feyzi, Daniel Hospital-Benito, Javier DufourSynopsis: DAC is increasingly seen as vital for meeting Paris Agreement targets, yet the environmental performance of emerging sorbents remains uncertain. This life cycle assessment evaluates a DAC system using the ionic liquid [P66614][Im] against KOH absorption and amine-based adsorption. Results show the IL-based system emits more CO₂ than it captures under fossil-based energy supply, but performs comparably or better under renewable electricity and low-carbon heat. With favorable energy mixes and locations, it achieves high removal efficiency and lower infrastructure demands.
Authors: Diogenis A. Kiziridis, Ilias Karmiris, Dimitrios FotakisSynopsis: Using a multi-objective analysis of 4,064 scenarios across the EU27 Mediterranean region, this study identifies a clear Pareto trade-off between high per-hectare sequestration and broad spatial coverage. Optimal strategies range from conservative to expansive policy regimes, with Spain and Greece emerging as key hotspots. Results show carbon gains can be maximised on marginal lands, avoiding arable soils and food security conflicts, and provide actionable guidance for CAP and
Authors: Thi Ly Pham, Phan Anh NguyenSynopsis: Decarbonising cement and concrete is critical for climate targets, prompting interest in carbon-negative materials. This study evaluates CO₂-curing and CO₂-foam concrete for Vietnam’s coastal and highway infrastructure. Precast revetment blocks achieved net sequestration of ~63 kg CO₂/m³, while foam concrete captured ~87 kg CO₂/m³. Nano-silica and nano-CaCO₃ improved strength and CO₂ fixation, enabling lower cement use. Compared with conventional concrete, these approaches demonstrate net-negative emissions potential, supporting Vietnam’s Net Zero 2050 goals.
Authors: Bamdad Ayati, Armor Gutierrez, Alan ChandlerSynopsis: This study integrates global mass-flow analysis of recoverable agricultural residues with dynamic life cycle assessment to evaluate climate benefits from diverting biomass into long-lived building materials. Fully shifting residues from combustion to durable storage yields persistent cooling, reaching −0.6 W m⁻² and −0.35°C after 100 years. However, scenarios constrained by realistic construction demand deliver much smaller benefits. Results show climate outcomes are highly sensitive to material lifetimes and end-of-life pathways, indicating that realizing meaningful mitigation would require expanding bio-based materials beyond current insulation uses.
Authors: Zurab MeskhidzeSynopsis: As climate mitigation efforts intensify, carbon credits have become a central market-based tool, with the global market projected to exceed $2.6 trillion by 2028. Despite this growth, the system faces major challenges, including opaque accounting, manual inefficiencies, double-counting, and fraud. This paper examines how blockchain technologies—through decentralized ledgers, smart contracts, and tokenization—can address these weaknesses by improving transparency, traceability, and trust. It argues that blockchain-enabled systems could significantly strengthen the integrity and efficiency of carbon removal projects and carbon credit trading.
Authors: Wanjie Cai, Haijiao Cui, Zhihan Wang, Zhiyi Wang, Nini Wen, Dan Li, Xu ZhengSynopsis: DAC is limited by high energy use and costs. This study proposes integrating DAC with an existing heating tower heat pump (HTHP), exploiting shared components and regeneration processes. Using a sodium carbonate solution to absorb both heat and CO₂, simulations show energy demand falls to 2.37 GJ/tCO₂ - 73% lower than conventional DAC - while costs drop to ~$39.5/tCO₂. With direct CO₂ utilization, energy use could fall further to 0.5 GJ/tCO₂, indicating a scalable, low-cost pathway for atmospheric carbon removal.
Authors: Pierre Friedlingstein, Corinne Le Quéré, Michael O’Sullivan, Judith Hauck, Peter Landschützer, Ingrid T. Luijkx et al.Synopsis: Despite the Paris Agreement, fossil CO₂ emissions continue to rise, pushing atmospheric concentrations to ~423 ppm in 2024 and warming to 1.36 °C, nearing the 1.5 °C threshold. This study integrates new observations to revise the global carbon budget, finding a smaller natural land sink, higher emissions from land-use change, and an ocean sink ~15% larger than land. Climate change has reduced sink efficiency, adding ~8.3 ppm CO₂ since 1960 and turning parts of tropical forests into net sources, highlighting the urgency of halting deforestation and limiting warming.
Authors: Kobayashi HSynopsis: Global warming persists despite renewable energy adoption, constrained by space, grid inertia, and storage limits. This study proposes floating offshore photovoltaics across equatorial waters to produce electricity for green hydrogen and ammonia fuel, transported via pipelines, while removing >3,600 Gt CO₂eq to return temperatures to 1960s levels. Modeling shows earlier implementation reduces costs and health impacts, potentially lowering energy prices below current levels. However, existing sea-level rise cannot be reversed, highlighting the need for verification and practical deployment.
Authors: Lili Xu, Bilin Jin, Ligong Zou, Yee Jun Tham, Yufeng Yang, Qing WangSynopsis: Seaweeds play key roles in marine ecosystems, but their contribution to carbon sequestration is debated. This study examined Sargassum decomposition under lab conditions, finding that 24.8% of dissolved organic carbon transformed into recalcitrant DOC (RDOC) after 240 days, while burial in sediments slowed decay and increased carbon sequestration by ~22%. Microbial activity converted labile DOC into RDOC enriched in CHOS/CHONS with high molecular stability. The results suggest that burying Sargassum in nearshore sediments could enhance long-term carbon storage and reduce coastal pollution.
Authors: Zahra Eshaghi Gorji, Baljeet Singh, Antti Lempinen, Timo RepoSynopsis: DAC of CO₂ is challenged by low atmospheric concentrations and high humidity. This study demonstrates a deep eutectic solvent (DES) composed of TBN and benzyl alcohol that efficiently captures CO₂ from humid air (>90% RH) with 0.154 gCO₂/gDES. The sorbent shows high stability, low toxicity, and recyclability, retaining 74% capacity after 50 cycles and 50% after 100 cycles. CO₂ desorption occurs at just 70 °C in 30 minutes, outperforming prior liquid absorbents in efficiency, durability, and practicality for DAC applications.
Authors: Noppadol PanchanSynopsis: Enhanced rock weathering accelerates CO₂ removal by dissolving silicate minerals, with microorganisms playing key roles in physical, chemical, and biological facilitation. This review highlights advances in microbial ecology, revealing community diversity and functions that drive mineral dissolution. Bioengineering and omics approaches offer potential to optimize microbial activity for faster weathering. Harnessing microbially-driven rock weathering could significantly contribute to climate mitigation and sustainable large-scale implementation.
Authors: Friedrich A. Burger, Urs Hofmann Elizondo, Hendrik Grosselindemann, and Thomas L. FrölicherSynopsis: OAE is a promising carbon dioxide removal strategy, but its effectiveness depends on mineral dissolution depth and particle size. Using an Earth system model with vertical dissolution profiles for olivine (forsterite), this study finds that coarser grains dissolve deeper, reducing carbon uptake efficiency by over 75% compared with surface dissolution. Efficiency is also time-dependent, rising slowly as alkalinity resurfaces. Results suggest OAE may be far less effective than previously assumed, with delayed and dispersed carbon sequestration complicating monitoring and verification.
Authors: Jack Peden, James Ryley, Jeronimo Terrones, Fiona Smail, James A. Elliott, Alan Windle, Adam BoiesSynopsis: Methane pyrolysis offers a pathway to produce hydrogen and solid carbon simultaneously. This study demonstrates a multi-pass floating catalyst CVD reactor that converts methane into hydrogen (85 vol%) and carbon nanotube (CNT) aerogel without external hydrogen input, achieving a 446-fold increase in molar efficiency. Using biogas as feedstock could enable net CO₂ sequestration. Pilot-scale extrapolations highlight scale-up challenges and opportunities, showing potential for sustainable fuel and material production from methane.
Wood preservation and carbon sequestration (Source)WEB POSTSREPORTSUPCOMING EVENTS2026(NEW) DeCarbon | 24-26 February 2026 | CopenhagenWe have curated a “Carbon Removal Events Calendar.” Explore and stay informed about upcoming events, conferences, and webinars on Carbon Dioxide Removal technology. Sync specific events / all events to your default calendar to ensure you never miss out on important CDR updates. Carbon Removal Events Calendar Add our Carbon Removal Events Calendar to your default calendar in 2 ways: Head to this link: https://teamup.com/kshqbfhrqkw36sxymd Sync specific event: Click the event → menu (≡) → Share → choose your calendar → Save. Or sync all events: Menu (≡) → Preferences → iCalendar Feeds → Copy URL → Add to your calendar settings → Subscribe. JOB OPPORTUNITIES“Limenet is a climate deep tech benefit company that has patented an innovative technology for removing carbon dioxide and storing it in the form of calcium bicarbonates in seawater.”
“Cula builds the digital infrastructure for the global carbon removal industry.”
“Varaha is a leading climate tech venture focused on nature-based solutions such as regenerative agriculture, ARR, and biochar projects that support smallholder land stewards at scale.”
“Carbon180 is building the carbon removal field and using federal policy to reverse two centuries of carbon emissions.”
“At Klimate, we enable companies pursuing real climate action to take responsibility for the emissions they can’t avoid.”
“Terraformation’s mission is to rapidly restore native forests and reverse climate change.”
Looking for your dream job in CDR? There are 608 jobs available *right now*: check them all out at: CDRjobs Board
YOUTUBE VIDEOSDr. Toufiq Reza: Could Biochar be the Key to Unlocking Martian Agriculture? | Biochar Today “In this episode of The Biochar Show, John Webster interviews Dr. Toufiq Reza, an expert in hydrochar and hydrothermal carbonization (HTC). They discuss the potential of biochar and hydrochar in agriculture, water treatment, and even on Mars. Dr. Reza explains the differences between biochar and hydrochar, their applications, and the challenges of commercialization. The conversation also touches on nutrient retention, PFAS remediation, and the future of these technologies in addressing environmental issues both on Earth and in space.”
Scaling Carbon Removal the “Unsexy” Way with Andrew Jones of Carba | Still Point Insight “Carbon removal gets a lot of attention—but not all solutions are created equal.In this episode of The Turning Point, we talk with Andrew Jones, founder of Carba, about why the most scalable carbon removal solutions aren’t flashy, centralized, or energy-intensive—and why that’s exactly the point.Andrew explains how Carba uses waste biomass to create biochar, permanently sequestering carbon while delivering powerful co-benefits like methane reduction, PFAS filtration, and landfill remediation. We also dive into why planting trees isn’t enough, how carbon markets really work, and what it takes to finance climate infrastructure that actually scales.”
Enhanced Rock Weathering for Greenhouse Gas Mitigation and Soil Carbon Sequestration | Dong-Gill Kim “Enhanced Rock Weathering (ERW) is a geochemical carbon dioxide removal (CDR) technology that accelerates natural silicate weathering to capture and durably store atmospheric CO₂. By applying finely crushed silicate rocks, such as basalt or olivine, to agricultural and forest soils, ERW converts CO₂ into stable bicarbonate ions, which are eventually stored in oceanic reservoirs for millennia. Peer-reviewed analysis indicates a significant global potential to sequester between 0.5 and 2.0 gigatonnes of CO₂ per year (GtCO₂/yr) on croplands by 2050, with a theoretical peak potential of up to 12.4 GtCO₂/yr if biotic feedbacks in forest ecosystems are leveraged.”
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