173 results for group: climate-change

Carbon dioxide removal efficiency of co-applied and co-pyrolyzed feedstocks for enhanced rock weathering and biochar in a sandy soil

Maria-Elena Vorrath, Johannes Meyer zu Drewer, Ingrid Smet, Cierra Aldrich, Lennard Stoeck, Lara Feiertag, Sedrik Nauenburg, Ivo Neumann, Marvin Scherzinger, Theresa Siegmund, Dirk Eifler, Louise Foster, Niko Lahajnar, Jens Hartmann, Susanne Hamburger, Liam Adam Bullock, Silvia Placitu, Ruadhan Magee, Remi Rateau, Claudia Kammann, Mathilde Hagens ABSTRACT: Enhanced rock weathering (ERW) and pyrogenic carbon capture and storage (PyCCS) are promising land-based approaches for carbon dioxide removal (CDR), yet their co-deployment remains poorly understood. This study investigates how co-application of minerals with biochar and co-pyrolysing ...

Combining biochar and basanite rock powder enhances carbon dioxide removal by carbonate alkalinity production

Johannes Meyer Zu Drewer, Maria-Elena Vorrath, Thorben Amann, Jens Hartmann, Maria Ansari, Marcela Cárcamo Pérez, Nikolas Hagemann ABSTRACT: The combination of enhanced rock weathering (ERW) with pyrogenic carbon capture and storage (PyCCS) has been proposed to harness synergistic effects on carbon dioxide removal (CDR). This can be facilitated by co-application of silicate rock powder and biochar or co-pyrolysis of rock powder and biomass to produce rock-enhanced (RE-)biochar. While it is well documented that co-pyrolysis of biomass and silicate rock does not affect the carbon yield nor the aromaticity of RE-biochar, the effect of co-pyro...

Investigating the effects of co-applied basalt and biochar on carbon removal efficiency and grain yield in rice paddy

Xueliu Gong, Jiarong Wu, Jingsong Qin, Jinkai Zhao, Kai Zhu, Chenglong Ye, Shaopan Xia, Jufeng Zheng, Wenkun Qie, Lianqing Li, Zi-Bo Li, Rongjun Bian ABSTRACT: Enhanced silicate weathering (ESW) has shown promise for carbon dioxide removal (CDR) in dryland agriculture, yet its effectiveness in flooded rice paddies, particularly regarding the CDR pathways and microbial interactions, remains poorly understood. In this study, we quantified CDR in rice paddy amended with basalt and/or biochar. Basalt applied at 36 t ha−1 sequestered ∼11.3 t CO2 ha−1 through carbonate formation and increased rice yield by 20.7%. Co-applying with 18 t ha−1 ...

Life cycle assessment of carbon removal via enhanced weathering of mill ash and basalt on North Queensland farmlands, Australia – Thesis

Xia, Jinyin ABSTRACT: This study evaluates the carbon dioxide removal (CDR) potential of two enhanced weathering (EW) materials—basalt and mill ash—applied to farmlands across North Queensland, Australia, as part of a life cycle assessment (LCA) of global warming mitigation strategies. Both materials were applied at a one-off rate of 50 t/ha and assessed over a 15-year period. CDR efficiencies were quantified using high-resolution geochemical modeling developed by the James Cook University research team, then compared against transportation and field-application emissions to estimate net CDR potential. A key contribution of this work is ...

Enhanced weathering in agriculture: impacts on organic carbon, soil fertility, and greenhouse gas dynamics – Thesis

Lucilla Boito ABSTRACT: Climate change constitutes one of the most urgent global challenges, driven predominantly by rising atmospheric concentrations of greenhouse gases. To remain within the temperature limits stipulated by the Paris Agreement, scenario analyses increasingly indicate that substantial atmospheric carbon dioxide removal will be required alongside rapid emission reductions. Within this context, enhanced weathering (EW) of silicate minerals has emerged as a promising carbon dioxide removal (CDR) strategy. By accelerating natural silicate dissolution, EW removes atmospheric CO₂. However, despite accelerating interest in EW, ...

Enhanced weathering for carbon dioxide removal: mechanistic advances, field evidence, and governance challenges

Bushra Munir, Seong Hyeon Nam, Byung Jun Park, Seok Soon Jeong, Jung-Hwan Yoon, Jinah Moon, Jae Yang, Hyuck Soo Kim ABSTRACT: Achieving net-zero emissions will require scalable and durable carbon dioxide removal (CDR) alongside deep mitigation. Enhanced weathering (EW) has long been proposed as a land-based CDR option, but its real-world performance and governance readiness have remained uncertain. This review assesses whether EW has progressed from theoretical promise to a credible CDR pathway by synthesizing recent advances in field evidence, monitoring–reporting–verification (MRV), life-cycle performance, risk management, and policy ...

Enhanced rock weathering in acid mine drainage systems: Field evidence and passive treatment implications

Htut San Hkaung, Naito Yamashita, Nono Kimotsuki, Fugo Nakamura, Frances Chikanda, Ryosuke Kikuchi, Yoko Ohtomo, Tsubasa Otake, Tsutomu Sato ABSTRACT: Despite basalt-based Enhanced Rock Weathering (ERW) showing promise in croplands, identifying alternative application sites is crucial for scaling carbon dioxide removal (CDR) and maximizing co-benefits. This study investigated acid mine drainage (AMD) systems as potential ERW sites, emphasizing the use of mining waste rock as reactive material. AMD environments are naturally acidic and characterized by continuous flow, conditions that accelerate mineral dissolution and enhance ERW effectivene...

A Novel Soil Porewater Extraction Technique for Enhanced Rock Weathering Products: SATuration – Centrifugation – Preprint

Kirstine Skov, Anežka Radkova, Kitty Agace, Talal Albahri, Matt Aitkenhead, Tzara Bierowiec, David Boldrin et al. ABSTRACT: Enhanced Rock Weathering (ERW) involves the application of crushed silicate-rich minerals to agricultural soils as a promising Carbon Dioxide Removal (CDR) strategy, with potential benefits for soil health and crop productivity. Effective Monitoring, Reporting, and Verification (MRV) techniques are essential for carbon credit validation and scalability of ERW. Current MRV methods, such as in-field soil porewater extraction, represent a potential barrier for scaling up ERW because the accuracy, sensitivity, and consiste...

Ocean alkalinity enhancement mentioning Coastal enhanced weathering?

James Campbell, Spyros Foteinis, Reinaldo Juan Lee Pereira, Mohamad Katish, Phil Renforth ABSTRACT: Ocean alkalinity enhancement is a promising carbon dioxide removal (CDR) approach, but scaling up to gigatonnes (Gt) of CO2 per year will require safe, sustainable, and abundant alkaline feedstocks. Here, we propose the use of a relatively unexplored resource for OAE, namely naturally occurring sodium (bi)carbonates. We identified and mapped 109 such deposits globally, although quantitative resource information is available for only 16. Quantified deposits collectively contain >200 Gt of sodium (bi)carbonate-rich minerals and brines, domina...

Biodiversity implications of land-intensive carbon dioxide removal

Ruben Prütz, Joeri Rogelj, Gaurav Ganti, Jeff Price, Rachel Warren, Nicole Forstenhäusler, Yazhen Wu, Andrey Lessa Derci Augustynczik, Michael Wögerer, Tamás Krisztin, Petr Havlík, Florian Kraxner, Stefan Frank, Tomoko Hasegawa, Jonathan C. Doelman, Vassilis Daioglou, Florian Humpenöder, Alexander Popp, Sabine Fuss ABSTRACT: Pathways consistent with global climate objectives typically deploy billions of tonnes of carbon dioxide removal (CDR) from land-intensive methods such as forestation and bioenergy with carbon capture and storage. Such large-scale deployment of land-intensive CDR may have negative consequences for biodiversity. Here ...