136 results for group: carbon-sequestration-1
Enhanced silicate weathering accelerates forest carbon sequestration by stimulating the soil mineral carbon pump
ABSTRACT:
Enhanced silicate rock weathering (ERW) is an emerging strategy for carbon dioxide removal (CDR) from the atmosphere to mitigate anthropogenic climate change. ERW aims at promoting soil inorganic carbon sequestration by accelerating geochemical weathering processes. Theoretically, ERW may also impact soil organic carbon (SOC), the largest carbon pool in terrestrial ecosystems, but experimental evidence for this is largely lacking. Here, we conducted a 2-year field experiment in tropical rubber plantations in the southeast of China to evaluate the effects of wollastonite powder additions (0, 0.25, and 0.5 kg m−2) on both soil organic ...
Geospatial assessment of the cost and energy demand of feedstock grinding for enhanced rock weathering in the coterminous United States
Introduction:
In an effort to mitigate anthropogenic climate impacts the U.S. has established ambitious Nationally Determined Contribution (NDC) targets, aiming to reduce greenhouse gas emissions by 50% before 2030 and achieving net-zero emissions by 2050. Enhanced rock weathering (ERW)—the artificial enhancement of chemical weathering of rocks to accelerate atmospheric CO2 capture—is now widely seen as a potentially promising carbon dioxide removal (CDR) strategy that could help to achieve U.S. climate goals. Grinding rocks to smaller particle size, which can help to facilitate more rapid and efficient CO2 removal, is the most energy-demanding ...
Reduced accrual of mineral‐associated organic matter after two years of enhanced rock weathering in cropland soils, though no net losses of soil organic carbon
ABSTRACT:
Enhanced rock weathering (ERW), the application of crushed silicate rock to soil, can remove atmospheric carbon dioxide by converting it to (bi) carbonate ions or solid carbonate minerals. However, few studies have empirically evaluated ERW in field settings. A critical question remains as to whether additions of crushed rock might positively or negatively affect soil organic matter (SOM)—Earth’s largest terrestrial organic carbon (C) pool and a massive reservoir of organic nitrogen (N). Here, in three irrigated cropland field trials in California, USA, we investigated the effect of crushed meta-basalt rock additions on different ...
How powdered rock could help slow climate change
WEB PAGE:
"A method called enhanced rock weathering shows promise at capturing carbon dioxide from the air"
Ann Leslie Davis (2024)."How powdered rock could help slow climate change": Science News, Vol 205 #12
https://www.sciencenews.org/article/powdered-rock-help-slow-climate-change
Mineral-enriched biochar delivers enhanced nutrient recovery and carbon dioxide removal
ABSTRACT:
Biochar production via biomass pyrolysis with subsequent burial in soils provides a carbon dioxide removal technology that is ready for implementation, yet uptake requires acceleration; notably, through generation of cost reductions and co-benefits. Here we find that biomass enrichment (doping) with refined minerals, mineral by-products, or ground rocks reduces carbon loss during pyrolysis, lowering carbon dioxide removal costs by 17% to US$ 80–150 t−1 CO2, with 30% savings feasible at higher biomass costs. As a co-benefit, all three additives increase plant-available nutrient levels. Doping with potassium-bearing minerals can ...
Investigation of an Indian Site with Mafic Rock for Carbon Sequestration
ABSTRACT:
The increasing extent of greenhouse gas emissions has necessitated the development of techniques for atmospheric carbon dioxide removal and storage. Various techniques are being explored for carbon storage including geological sequestration. The geological sequestration has various avenues such as depleted oil and gas reservoirs, coal-bed methane reservoirs, and mafic and ultramafic rocks. Different trapping mechanisms are in play in these subsurface storage systems. In these sequestration sites, the mafic and ultramafic rocks are best suited for long-term and effective sequestration as they comprise minerals, conducive for chemical ...
Sustainability performance of enhanced weathering across countries
ABSTRACT
Enhanced weathering (EW) is a promising negative emission technology involving the application of crushed silicate rocks to croplands for carbon capture. There is limited research about the broad sustainability impacts in rolling out this intervention on a large scale. This research assesses the triple bottom line sustainability of EW in eight top-emitting countries using an extended input-output model. Results indicate that overall sustainability performance of EW is influenced by each country’s environmental and social metrics than the economic. Compared to developed countries (UK, France, Germany, USA), emerging economies (Brazil, ...
The efficacy of enhancing carbonate weathering for carbon dioxide sequestration
ABSTRACT:
Enhanced weathering is a geoengineering strategy aiming to increase continental weathering rates, thereby increasing the delivery of atmospheric carbon (as HCO−3) to the oceans. Most enhanced weathering studies focus on the capacity of silicate rocks (e.g., basalt) and minerals (e.g., olivine, Mg2SiO4, or wollastonite CaSiO3) to remove atmospheric CO2. However, carbonate minerals (e.g., calcite, CaCO3) could provide an additional, rapid way to increase HCO−3 export to the oceans. Recent studies suggest that 0.84 Gt C yr−1could be removed from the atmosphere through the enhanced dissolution of calcite in soils, provided carbonic acid ...
BIOGEOCHEMICAL POTENTIAL OF INDIA – by Dr. Ishfaq Ahmad Mir-Meeting Recording
TITLE PAGE:
India's biogeochemical potential to feed the country and stabilize the climate
Dr. Ishfaq Ahmad Mir
Senior Geologist Geological Survey of India
State Unit Karnataka and Goa Bengaluru
Presented to the Geological Society of India; June , 2024
RECORDING:
SLIDES:
ERW Talk.pptx
Enhanced Weathering Policy Primer: Assessing the Opportunity
INTRODUCTION
There is clear scientific consensus that, in addition to rapid and deep reduction of global greenhouse gas emissions, carbon dioxide removal (CDR) will be required at an immense, multi-gigatonne (Gt) annual scale by mid-century to meet the goals of the Paris Agreement and limit warming to 1.5 or even 2°C.1 CDR encompasses a range of approaches, and to meet the massive challenge to achieve gigatonne scale will require a portfolio of solutions.2 Many of these pathways are new technologies that could potentially take years to develop, demonstrate, and deploy. Methods of CDR that offer meaningful co-benefits, and that can be ...
