 | | | | Links to recent scientific papers, web posts, upcoming events, job opportunities, podcasts, and event recordings, etc. on Carbon Dioxide Removal TechnologyBiochar Carbon Removal Volume | 2022 - 2025H1 (CDR.fyi) Everything we publish on Carbon Removal Updates is free to access. If you value this work and are able, please consider supporting us as a paid subscriber. Your support sustains this vital work and helps us reach more people with balanced, timely information on this critical topic.
TABLE OF CONTENTSNote: Click on the headings listed in the table of contents above to easily navigate to the sections you're interested in. THIS WEEK’S TOP CDR HIGHLIGHTSCDR SHOPS: Carbon Drawdown Initiative has launched a curated directory of shops offering verified carbon dioxide removal. The platform helps individuals and SMEs purchase high-quality CDR quickly, transparently, and without sales calls. NEW CDR RESOURCE: Carbon Removal Canada launched the Carbon Console, a comprehensive dashboard that tracks everything happening in Canada's carbon removal sector in real time. CALL FOR CONSULTATIONS: Puro.earth has opened public consultation on its revised enhanced rock weathering methodology, reflecting latest advances and streamlining projects. Feedback closes Sept 28, 2025, with an informational webinar on Sept 17. REPORT: According to CDR.fyi’s new biochar market report, between 2022 and mid-2025, 3.04Mt of biochar CDR credits were contracted, with 1.6Mt in H1 2025 alone. Deliveries total ~683,000 tonnes; retirements ~330,000 tonnes. Microsoft, Google, BCG & JPMorgan are major buyers; Exomad Green supplies 60% of sold credits. COMPETITION: Applications are open for the Autumn 2025 Carbon Removal Booster cohort. Selected teams can access up to CHF 24,000 funding, expert methodological support, and a strong network of 70+ stakeholders across business, politics, and society (Deadline: 26 October 2025). AUTOMATED CREDIT VERIFICATION: Isometric has introduced AI-assisted validation in its Certify platform, marking a first for carbon removal. The tool speeds up reviews by flagging issues early, giving suppliers faster feedback and credit issuance. Read on to unpack more updates: COMMERCIAL NEWS Share Carbon Removal Updates RESEARCH PAPERSAuthors: James T. Randerson, Yue Li, Weiwei Fu, Francois Primeau, et al.Synopsis: Recent analysis suggests the global land carbon sink may be much weaker than widely reported. Using atmospheric inversion and satellite biomass data, researchers estimate a net land sink of 0.8 ± 0.7 PgC/yr (2000–2019) - about half the Global Carbon Project value. Adjustments to ocean (+8%) and fossil fuel (−6%) fluxes improve budget consistency with vegetation carbon, CO₂ gradients, and O₂ trends. The study calls for model refinements and new tests of the weak land sink hypothesis.
Authors: Lina RoeschelSynopsis: This study reviews governance challenges of marine carbon dioxide removal (mCDR) using PRISMA and the Socio-Ecological-Technological Systems (SETS) framework. From 35 studies, 100 challenges were identified, most spanning social, ecological, and technological domains. Issues include fragmented governance, ecological risks, and legitimacy concerns. The findings stress that siloed approaches are insufficient, and SETS can guide system-aware, cross-domain governance frameworks.
Authors: Laibao Liu, Mathias Hauser, Michael Windisch & Sonia I. SeneviratneSynopsis: Agroecological droughts are set to intensify with climate change, and while CDR is seen as essential, its reversibility effects remain unclear. Using CDR-MIP model experiments, researchers show drought risks are not symmetrically reversed: severity remains 65% higher and frequency only 73% reversed under equivalent CDR. Irreversibility is strongest in the Mediterranean, Central America, southern Africa, and Australia, underscoring the need for long-term drought adaptation alongside CDR.
Authors: Peter Fiekowsky, Alan K. BurnhamSynopsis: After the 1991 Pinatubo eruption, global CO2 levels dropped ~2.25 ppm (~17.6 Gt) below projections and did not rebound. Analysis suggests ashfall into a downwelling eddy sustained iron concentrations, enabling nitrogen-fixing phytoplankton blooms and large CO2 uptake. Similar effects were observed in other eruptions near eddies, but not distant ones. This supports a nitrogen-assisted ocean iron fertilization (N-OIF) hypothesis, potentially scalable for multi-gigaton CO2 removal.
Authors: Zarko P. Jovanov, Dingchang Yang, Carla Glassl, Qilei Song, Ifan E. L. StephensSynopsis: Electrochemical DAC using pH-swing methods, especially bipolar membrane electrodialysis, shows strong potential for scalable CO2 removal. Key challenges span multiple levels: durable, high-performance ion exchange layers (molecular), energy-efficient stack designs (micro), and integration with renewables plus advanced solvents/reactors (system). Meeting these milestones could lower costs, boost efficiency, and expand CO2-removal capacity.
Authors: Nirav P. Raval, Aravind D, A. N. Ramesh, Himanshu Pandey, Pradeep Kumar Ghosal, Milind Rawal & Mrugesh H. TrivediSynopsis: India’s rising energy demand is met largely by coal TPPs, driving emissions. To align with NDC goals, 33% green cover is mandated at TPPs. This study assessed carbon sequestration at Tata CGPL (465 ha) and its township (13.9 ha) using field data, CASA modeling, RS, and GIS. The TPP stored far more CO2eq (52.5 vs. 2.1 Mg ha⁻¹). Biomass was the strongest predictor of storage, with NDVI showing vegetation gains. Results highlight afforestation’s role in industrial carbon mitigation and SDGs.
Authors: Shuaimin Chen, Wei Fan, Haiyan Wu, Song Cheng, Jianzhao Liu, Zuowei Fan, Yao Liang, Hongguang CaiSynopsis: Intensive farming has depleted soil organic carbon (SOC) in NE China’s black soils. This study tested tillage plus straw retention strategies. Deep tillage with straw (DS) raised SOC 30–36% in 0–40 cm, while no-tillage with mulching (MS) boosted SOC 45% in 0–20 cm. Both increased recalcitrant carbon shares, with lignin phenols rising more than microbial necromass. DS altered microbial communities at depth, enhancing subsoil carbon capture and homogenizing microbial functions across layers.
Authors: Annette Cowie, Kati Koponen, Anthony Benoist, Göran Berndes, Miguel Brandão, et al.Synopsis: Bioenergy, including BECCS, is central to climate mitigation but its effectiveness varies widely across studies. Climate impacts depend on biomass system features, conversion efficiency, and methodological assumptions such as land-use alternatives, displaced energy sources, and system boundaries. An updated methodology from IEA Bioenergy provides guidance on reference systems, boundaries, co-product handling, climate forcers, and metrics. Standardized approaches can improve comparability and robustness of bioenergy assessments.
Authors: Zhuo Ning, Van Chen & Changyou SunSynopsis: Forest carbon sequestration depends heavily on harvest rotation decisions. A meta-regression of 59 studies shows that higher carbon prices extend rotation ages, while higher discount rates shorten them. Policies assuming stochastic timber prices, carbon payments, or penalties also lengthen rotations, whereas thinning and product decay reduce them. Insignificant effects (e.g., bioenergy, monitoring costs) highlight research gaps. Results stress context-sensitive policies and flexible modeling for carbon-focused forestry.
Authors: Wenjun Peng, Xinqiang Zou, Yanyan Huang andHui LiSynopsis: This study assessed carbon storage in three building-attached green space types at a Wuhan public building, totaling 19,873 kg C—mostly from the green square. DBH and crown diameter strongly predicted tree and shrub carbon, respectively. Optimized planting strategies raised storage by 131.5% to 45,964 kg C and doubled carbon density, offering a framework for climate-responsive urban design and sustainable development.
Authors: Hongpeng Wang, Haimei WangSynopsis: Mangroves play a crucial role in carbon neutrality through biomass and soil carbon storage, influenced by tides, salinity, and human pressures like aquaculture, logging, and coastal development. Using shrimp farming in SE Asia as an example, the study highlights carbon loss from degradation. It advocates monitoring systems using satellites, drones, and long-term soil/biomass tracking, citing Philippine experience. Strengthened global cooperation and policies can boost mangroves’ climate and coastal benefits.
Authors: Helen Findlay, Richard Feely, Kalina Grabb, Elizabeth Jewett, et al.Synopsis: The Global Ocean Acidification Observing Network (GOA-ON) builds on decades of monitoring and modeling ocean carbonate chemistry, with goals to track OA conditions, assess ecosystem responses, and support modeling. Its regional hubs inform local action while sharing data and best practices globally. Lessons from OA monitoring are vital for marine CDR research - supporting site selection, field trials, and MRV through robust observations, sensors, and biological indicators.
Authors: Matthew C. Enebe, Ram L. Ray & Richard W. GriffinSynopsis: Biochar offers a sustainable, nature-based solution for soil carbon sequestration by reducing microbial carbon mineralization, enhancing soil aggregation, neutralizing acidity, and boosting microbial diversity. This review synthesizes research on biochar’s role in soil health, carbon storage, and greenhouse gas suppression, while highlighting factors influencing its effectiveness. It also identifies knowledge gaps and calls for further studies to strengthen biochar’s role in climate change mitigation.
Hysteresis and reversibility framework (Source)WEB POSTSTHESESAuthors: Hussain AlmajedSynopsis: This dissertation develops process models linking atmospheric CO₂ capture with electrochemical conversion, focusing on air-to-X pathways. It identifies electricity pricing as a key cost driver, explores pH mismatches in DAC-electrolyzer integration, and evaluates bipolar membrane electrodialysis for regeneration. Findings highlight the importance of power system integration in enabling efficient, scalable CO₂ capture-conversion systems toward net-zero goals.
REPORTSShare Carbon Removal Updates UPCOMING EVENTSSeptember 2025October 2025November 2025December 2025We 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 JOB OPPORTUNITIES"Equatic is a Series A climate-tech startup scaling pioneering seawater electrolysis to remove CO₂ from the atmosphere while generating clean hydrogen."
"As a team of scientists, farmers, and entrepreneurs, Loam Bio is on a mission to revolutionise agriculture and address climate change. Through our cutting-edge microbial technology, we are enhancing soil health, boosting crop yields, and sequestering carbon to create a sustainable future for farming."
"UNDO is on a mission to tackle the greatest challenge of our time: climate change. We are a fast-growing for-profit business that is already one of the biggest carbon dioxide removal companies in the world."
"Kodama Systems is a technology company transforming the forestry industry with teleoperation and supervised autonomy."
"Vaulted is a waste management company that removes carbon. We take organic waste that can pollute our environment above ground and safely inject it ultra deep underground—permanently removing carbon from the atmosphere while protecting local land, air, and water."
"Looking for a highly motivated PhD student to join our research team and contribute to advancing the field of systems analysis of carbon dioxide removal (CDR) and hydrogen solutions under my supervision. Applicants with a strong background in this area and a genuine interest in promoting sustainable development are highly encouraged to apply for this exciting opportunity."
"Skytree enables a transition to a world with cleaner Air for everyone. We do this by developing and deploying smart technology that captures atmospheric carbon dioxide, enabling its use or storage to combat climate change and aid society and businesses around the world."
"CEEZER is a digital platform providing companies with easy, secure, and direct access to high-quality projects from the entire voluntary carbon market. With over 13.5 million data points, CEEZER brings transparency to the carbon market, highlighting critical differences in project quality, risk, and impact."
Looking for your dream job in CDR? There are 625 jobs available *right now*: check them all out at: CDRjobs Board
PODCASTS"Microsoft’s Brian Marrs, Senior Director of Energy and Carbon Removal, and Chestnut Carbon CFO Greg Adams share their perspectives as a major buyer and developer of carbon removal credits. Their 2025 deal is one of the largest carbon removal deals in the U.S. and seeks to deliver 7 million tons of nature-based carbon credits over 25 years. Brian explains Microsoft’s carbon negative strategy and targets, and the role of carbon removal credits. He also describes how Microsoft is using its Climate Innovation Fund and procurement efforts to “build missing markets” in decarbonized energy, materials, and transportation. Greg describes how Chestnut Carbon combines afforestation, land ownership, and a private equity-backed project development model to deliver high-integrity carbon credits. He explains how their work is similar to long-term energy infrastructure contracts like power purchase agreements (PPAs), and how they are using proprietary tools to scale. Brian and Greg also share their advice for those looking to learn more and work in the field."
"Philanthropy is the bridge to a scaled carbon market," Adam Fraser, Terraset CEO | Carbonsations | "Philanthropy is the bridge to a scaled carbon market," Adam Fraser, Terraset CEO Carbonsations 31:30 |
"Joining us in this episode is Adam Fraser, CEO of non-profit philanthropic organization Terraset. Adam talks about his journey from sports journalism to climate and dives deep into the ins and outs of channeling philanthropic funds into carbon removal projects."
Carbon Credit Ratings: What really matters right now? - with Bojana Bajzelj | The CDR Policy Scoop | Carbon Credit Ratings: What really matters right now? - with Bojana Bajzelj The CDR Policy Scoop 26:07 |
"Carbon rating agencies have increasingly become an indispensable pillar of carbon market infrastructure. While originally created to solve deep-seated quality and integrity concerns in the voluntary carbon markets, they are now also playing a role in compliance markets.What really goes into rating carbon removal projects, and what are the expected future developments? With the ICVCM establishing Core Carbon Principles eligibility for some CDR methods, will project-based ratings still be necessary?To help us untangle this, we’re excited to welcome Bojana Bajzelj, PhD, VP of Carbon Removal at BeZero Carbon, one of the leading carbon ratings agencies. She brings unique expertise on what makes a carbon credit truly credible in a rapidly changing landscape.Join as co-hosts Eve Tamme and Sebastian Manhart get clarity on trust, quality, and the future of CDR in carbon markets. Tune in for sharp insights into the science and analysis that underpin ratings, as well as a candid discussion on the future of credit ratings."
The UK means business: Examining the GGR Business Model - with Laura Hurley | The CDR Policy Scoop | The UK means business: Examining the GGR Business Model - with Laura Hurley The CDR Policy Scoop 29:38 |
"At the end of August, the UK government released over 500 pages of documentation on how it plans to finance the scale-up of removals.There is a lot to talk about: the UK has committed over £22B to CCUS (including CDR) over 25 years, of which £9.4B has already been allocated in the 2025 Spending Review.It has also recently released its vision for how to integrate CDR into the UK ETS, potentially as early as 2029 (ahead of the EU).Now it suggests 15-year carbon contracts for difference (CCfDs) for BECCS and DACCS projects, as well as up to 50% of CAPEX support.We’re grateful to welcome Laura Hurley, an absolute UK policy pro, to unpack these news. In fact, she set up the UK’s first GGR policy team back in 2020.Join as co-hosts Eve Tamme and Sebastian Manhart go deep on what could be the most ambitious CDR policies in Europe to date."
Weave Got Catalysts: Textile-immobilized Enzymes for CO2 Capture with Sonja Salmon | The Climate Biotech Podcast | Weave Got Catalysts: Textile-immobilized Enzymes for CO2 Capture with Sonja Salmon The Climate Biotech Podcast 57:02 |
"Sonja Salmon takes us on a fascinating journey through her 20-year quest to harness the power of enzymes and textiles to fight climate change. Her background in textile chemistry led to a deep understanding of natural polymers like cellulose and chitosan, which eventually connected to her fascination with enzymes during a 22-year career at the world's largest industrial enzyme company.The heart of Salmon's innovation lies in immobilizing carbonic anhydrase. This remarkably fast enzyme converts carbon dioxide to bicarbonate, in this case onto textile surfaces. By coating cotton with chitosan and using reactive dye chemistry as a cross-linking agent, she creates a durable attachment that maintains the enzyme's activity while providing an ideal gas-liquid contact surface. This ingenious approach transforms ordinary fabric into a carbon capture device with minimal energy requirements.What makes this approach so promising is its accessibility and scalability. The global textile manufacturing infrastructure already exists, and the materials involved are largely bio-derived and familiar to the industry.Beyond carbon capture, Salmon's collaborative work extends to nitrogenase, an enzyme that could potentially replace the carbon-intensive Haber-Bosch process responsible for 2% of global CO2 emissions. Her vision of conductive textiles delivering electrons to immobilized nitrogenase points to a future where our clothes might literally help save the planet.Join us to discover how this innovative scientist is weaving together biology and fabric into powerful climate solutions, and why she believes so strongly that we can—and must—take action on climate change. Check out Textile Biocatalysis Research online or biocatncsuedu to learn more about Professor Salmon's groundbreaking work."
YOUTUBE VIDEOSHow to End the Climate Crisis by 2050 | Peter Fiekowsky | TEDx Talks "Peter Fiekowsky's talk about a viable solution (Ocean Iron Fertilization) for global warming is very good news indeed. Nature shared the secret decades ago but are we ready to listen? Peter Fiekowsky is an MIT-educated physicist and engineer, serial entrepreneur, philanthropist, social innovator, and author. He has worked at NASA and the Fairchild/ Schlumberger Artificial Intelligence Lab in Palo Alto; taught at MIT; and developed his own machine vision company, Automated Visual Inspection LLC (AVI). He holds 27 patents."
Removing and storing CO₂? Between hype and reality | Documentary NZZ Format "Can CO₂ removal technologies – also known as carbon dioxide removal (CDR) – still save the climate goals? Startups and research institutions around the world are working hard on processes such as direct air capture (DAC), bioenergy with carbon capture and storage (BECCS), and biochar to filter carbon dioxide directly from the atmosphere. In a world where it is becoming increasingly difficult to achieve climate goals, the importance of these technologies is growing. The hype has therefore been enormous in recent years. But is the progress made so far sufficient? "NZZ Format" sheds light on the reality beyond the hype. By 2050, several billion tons of CO₂ are to be removed annually. Currently, the global capacity for carbon capture is around 1 million tons – far too little to enable the necessary expansion in time, many fear. And apart from Microsoft, hardly anyone wants to pay for it. The documentary showcases the current state of the art and examines whether scaling, financing, and political frameworks are sufficient to remove the billions of tons of CO₂ that are urgently needed, in addition to emissions reductions, to achieve global climate goals. The focus is on the Swiss pioneers Climeworks and Neustark, among others. It explores groundbreaking ideas such as ocean alkalinity enhancement, the mineralization of CO₂ in demolition concrete, in Icelandic basalt, or the storage of CO₂ in old oil and gas fields in Northern Europe or the Middle East. The wealth of ideas is vast, but the reality of the market is extremely harsh. A film about the race against time – between technological feasibility, economic limits, and political will."
Accelerating the energy transition with CCUS and carbon storage | SLB "Carbon sequestration is one of the most urgent challenges in the race to net-zero. As 2050 approaches, the need for effective carbon storage solutions becomes increasingly critical.Delve into the current CCUS landscape, key challenges, and the innovations driving a cleaner future."
2025 Carbon Removal Challenge Finalist Recap | OpenAir "The 2025 Carbon Removal Challenge was the third annual installment of the only annual international competition for higher education students to design and create new carbon removal solutions. This video recaps this ever growing student challenge, the amazing work done by our finalist teams, and the incredible opportunity the experienced by being able to present their award winning ideas at the 2025 Carbon Unbound conference in May 2025, in New York City."
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