🚨NEW STUDY🚨
“Given the high expectations placed on #DAC for future #decarbonisation, recent study presents an extensive review of DAC tech, exploring a number of techno-economic aspects, including an updated collection of the current & planned DAC projects around the world.”
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“A dedicated analysis focused on the production of synthetic methane, methanol, and diesel from #DAC and electrolytic hydrogen in the European Union (EU) is also performed, where the #carbonfootprint is analysed for different scenarios and energy sources.”
2/10
The results show that “the maximum grid carbon intensity to obtain #NegativeEmissions with #DAC is estimated at 468 gCO 2 e/kWh, which is compliant with most of the EU countries’ current grid mix.”
3/10
“Using only photovoltaics (PV) and wind, #NegativeEmissions of at least −0.81 tCO 2 e/tCO 2 captured can be achieved.”
4/10
“The maximum grid intensities allowing a reduction of the synthetic fuels carbon footprint compared with their fossil-fuels counterparts range btw 96 & 151 gCO 2 e/kWh.”
5/10
However, “to comply with the Renewable Energy Directive II (REDII) sustainability criteria to produce renewable fuels of non-biological origin, the maximum stays between 30.2 to 38.8 gCO 2 e/kWh.”
6/10
“Only when using PV and wind is the EU average able to comply with the REDII threshold for all scenarios and fuels, with fuel emissions ranging from 19.3 to 25.8 gCO 2 e/MJ.”
7/10
These results highlight the “importance of using renewable energies for the production of synthetic fuels compliant with the EU regulations that can help reduce emissions from difficult-to-decarbonise sectors.”
8/10
Read the paper entitled: "The Role of Direct Air Capture in EU’s Decarbonisation and Associated Carbon Intensity for Synthetic Fuels Production" here ⬇️ econpapers.repec.org/article/gamjen…
🚨How does #SolarGeoengineering affect air pollution & public health?
New study using a cutting-edge Earth system model shows that #SAI has only modest effects on PM₂.₅ & ozone-related mortality & these impacts are mostly due to climate shifts, not aerosol deposition.🧵1/8
2/ Using CESM2-WACCM6 simulations across three scenarios (SSP2-4.5 baseline, ARISE-SAI-1.5, ARISE-SAI-1.0), the study quantifies global mortality attributable to ozone (O₃) & fine particulate matter (PM₂.₅) under future SAI deployment targeting 1.5°C and 1.0°C warming levels.
3/ Findings:
In the ARISE-SAI-1.5 scenario, maintaining global mean temp at 1.5°C above pre-industrial levels via SAI results in:
- 1.26% reduction in ozone-related mortality
- 0.86% increase in PM₂.₅-related mortality during 2060–2069, relative to SSP2-4.5.
📰 Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (21-27 July 2025):
🔗:
🧵0/22
Chestnut Carbon secured up to $210M in non-recourse financing, led by J.P. Morgan for its afforestation project, marking a first-of-its-kind deal in the US carbon removal space.
🚨Scientists have discovered a common soil bacterium, Bacillus megaterium, that can rapidly remove CO2 from the atmosphere by transforming it into solid limestone (calcium carbonate) within 24 hours, without creating toxic byproducts.
#CDR #CarbonMineralization
DETAILS🧵1/8
2/ Microbially induced calcite precipitation (MICP) is a technique where microbes precipitate CaCO₃, often used in eco-friendly building materials.
Most MICP uses urease to break down urea, which produces ammonium, a problematic byproduct.
3/ Bacillus megaterium is unique in a sense, it contains both urease and carbonic anhydrase (CA) enzymes. The latter allows it to fix CO₂ directly without needing urea.
But which pathway dominates? This study investigated that.
🚨Solar Geoengineering (#SRM) may seem cheap (~$18B/yr) to cool the planet, but when you factor in societal risks, political instability & sudden climate rebounds, the true cost may far exceed technical estimates from both moral & practical standpoints, says a new study.
🧵1/11
2/ SRM often gets touted as cheap even “pennies per ton” compared to the hundreds of $/ton needed for large-scale CDR.
But these estimates usually ignore the real-world costs of deploying SRM in a politically fractured and climate-damaged world.
3/ The authors outline four cost domains that traditional SRM estimates often miss:
1️⃣ Compensation for harms
2️⃣ International coordination
3️⃣ Domestic political feasibility
4⃣ Termination Shock
Each could add major financial & political costs. Details below:
SeaO2, in collaboration with TU Delft, University of Twente, and NERA secured nearly $2M for a seawater-to-e-SAF project via TKI Energy and Industry program.