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Monthly Solar Geoengineering Updates (September'2025)

Geoengineering Info @geoengineering1.bsky.social · 2d

We covered all this and more in our September 2025 roundup. Read here:
solargeoengineeringupdates.substack.com/p/monthly-so...

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September at a glance: From polar geoengineering debates & UK-EU SRM positions to U.S. Congressional hearings, African governance calls, ethics projects & new researches, SRM discussions grow globally

Geoengineering Info @geoengineering1.bsky.social · 2d

9️⃣ @nuffieldfoundation.org launches SRM ethics project; findings expected by 2027.

🔟 African scientists urge Africa to lead SRM governance for justice & local priorities.

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Geoengineering Info @geoengineering1.bsky.social · 2d

6️⃣ U.S. House Oversight hearing on SRM mixes science, policy & controversy.

7️⃣ Cambridge Autumn Climate Repair Lectures launch, exploring planetary cooling & climate justice.

8️⃣ @universitypress.cambridge.org study finds balanced SRM messaging boosts support for emissions reductions.

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Geoengineering Info @geoengineering1.bsky.social · 2d

3️⃣ @tudelfteemcs.bsky.social funds project to gauge public acceptance of Marine Cloud Brightening.

4️⃣ Reflective opens SAI Uncertainty Database for expert feedback to guide SRM research. @aliduffey.bsky.social

5️⃣ UK rejects Antarctic SRM; EU stresses governance, risks & global oversight.

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Monthly Solar Geoengineering Updates (September'2025)

Geoengineering Info @geoengineering1.bsky.social · 2d

1️⃣ Polar geoengineering study warns of high risks, costs & distraction from decarbonization; sparks debate & inspires open letter signed by 100+ scientists advocating continued SRM research.

2️⃣ @hpacoalition.bsky.social to host an online 2°C prevention conference, mobilizing global action.

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Geoengineering Info @geoengineering1.bsky.social · 2d

🚨Top Solar Geoengineering (SRM, Climate Intervention) Highlights from Past Month (September’25):
solargeoengineeringupdates.substack.com/p/monthly-so...

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September at a glance: From polar geoengineering debates & UK-EU SRM positions to U.S. Congressional hearings, African governance calls, ethics projects & new researches, SRM discussions grow globally

Agronomic Performance of Enhanced Rock Weathering in a Tropical Smallholder System: A Maize Trial in Kenya – CDRXIV

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Robert Höglund @roberthoglund.bsky.social · 9d

Slow reductions=LESS CDR
I often see the argument that the more emissions remain the more CDR is needed. Example below
But it's the opposite! If a lot of emissions remain it means there wasn't enough political will & capital to address them. That will & capital won't magically appear for CDR instead

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CDRXIV @cdrxiv.org · 24d

Agronomic Performance of Enhanced Rock Weathering in a Tropical Smallholder System: A Maize Trial in Kenya. cdrxiv.org/preprint/410

Enhanced Rock Weathering (ERW) is a promising negative emission technology that can simultaneously sequester atmospheric CO₂ and improve agricultural productivity. While its efficacy has been demonstr...

Aggregated monitoring of enhanced weathering on agricultural lands – CDRXIV

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CDRXIV @cdrxiv.org · 18d

Aggregated monitoring of enhanced weathering on agricultural lands. cdrxiv.org/preprint/394

Terrestrial enhanced weathering (EW) on agricultural land is a promising carbon dioxide removal (CDR) pathway with high potential to scale. Enhanced weathering also has the potential to provide signif...

Synergistic effects of enhanced rock weathering and organic inputs on soil carbon accrual. – CDRXIV

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CDRXIV @cdrxiv.org · 15d

Synergistic effects of enhanced rock weathering and organic inputs on soil carbon accrual. cdrxiv.org/preprint/418

Enhanced Rock Weathering (ERW)—the application of crushed silicate minerals to croplands—holds promise for drawing down excess atmospheric carbon dioxide through accelerated biological and chemical we...

Insights lost at points of vulnerability in UK policy evidence gathering on Carbon Dioxide Removal – CDRXIV

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CDRXIV @cdrxiv.org · 10d

Insights lost at points of vulnerability in UK policy evidence gathering on Carbon Dioxide Removal. cdrxiv.org/preprint/412

The methods, quantity, and timing of carbon dioxide removal (CDR) is impacted by, and has implications for, decarbonising energy, land use change, agriculture, the earth system response, and global so...

Carbon Capture Startup Moves Project to Canada From US

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Michelle Ma @michellema.bsky.social · 9d

Scoop: CarbonCapture Inc. has moved its 2,000-ton direct air capture project from the US to Canada, compelled by shifting political winds and a better policy environment in the north, CEO Adrian Corless told me:

www.bloomberg.com/news/article...

The startup building it moved the project north due to better incentives and what it views as a more stable regulatory environment.

www.bloomberg.com

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David Ho @davidho.bsky.social · 8d

Like all other CO₂ removal (CDR) techniques, significantly more research is needed over the next few decades to determine whether enhanced rock weathering is a viable method for CDR.

Challenges and opportunities in scaling enhanced weathering for carbon dioxide removal - Nature Reviews Earth & Environment

Commercial investment in enhanced rock weathering for carbon dioxide removal on agricultural lands is growing rapidly. This Review explores the potential of large-scale deployment, outlining the challenges faced in science, policy and governance to scale the technology.

www.nature.com

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Dan Visioni @danvisioni.bsky.social · 23d

Dakota Gruener and I have a new piece out in the new issue of @worksinprogress.bsky.social : worksinprogress.co/issue/sunscr...

Sunscreen for the planet - Works in Progress Magazine

The world is warming faster than we can cut emissions. But volcanoes already been cool the planet accidentally. If nature can cool the Earth, maybe we can.

worksinprogress.co

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Matthew Henry @mattjohenry.bsky.social · 23d

Beautifully illustrated and clear write-up on SRM by @danvisioni.bsky.social and Dakota Gruener.

worksinprogress.co/issue/sunscr...

Sunscreen for the planet - Works in Progress Magazine

The world is warming faster than we can cut emissions. But volcanoes already been cool the planet accidentally. If nature can cool the Earth, maybe we can.

worksinprogress.co

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Dan Visioni @danvisioni.bsky.social · 25d

Today we joined Natalie Mahowald, Lead Author of the IPCC 1.5SRE, to have a wide-ranging discussion on the topic of geoengineering, from the science to the governance challenges and ethical implications. Thanks to @cornelluniversity.bsky.social for organizing!

www.youtube.com/watch?v=o15F...

Geoengineering: The Science and Myths of Climate Intervention

YouTube video by eCornell

www.youtube.com

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Dan Visioni @danvisioni.bsky.social · Sep 5

Out as preprint, we have some very interesting results looking at the radiative forcing impacts of the 2022 Hunga eruption. Based on the outcomes of the related OMIP, with many models from all over the world participating in this effort, we find a robust cooling signal from the Hunga volcanic plume.

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Eve Tamme @evetamme.com · Sep 5

Remember the #EUETS review?

Results - overwhelming majority wants the ETS installations to have access to permanent removals.

ec.europa.eu/info/law/bet...

#CarbonRemoval

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Geoengineering Info @geoengineering1.bsky.social · Sep 6

Subscribe to the Solar Geoengineering Updates Substack Newsletter for more details:
solargeoengineeringupdates.substack.com

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Solar Geoengineering Updates | Andrew Lockley | Substack

Weekly and Monthly news summaries about solar geoengineering. Links to scientific papers, news articles, jobs, podcasts, and videos. Click to read Solar Geoengineering Updates, by Andrew Lockley, a Su...

Monthly Solar Geoengineering Updates (August'2025)

Geoengineering Info @geoengineering1.bsky.social · Sep 6

9️⃣ UChicago CSEi opens postdoc call on climate systems engineering (apply by Nov 18)
climateengineering.uchicago.edu/news/csei-op...

We covered all this and more in our August 2025 roundup. Read here:

solargeoengineeringupdates.substack.com/p/monthly-so...

6/7

August at a glance: From IPCC SRM author appointments & UNEP’s global workshop to Arctic governance calls & fresh science on AMOC & more, SRM debates continue to broaden & accelerate worldwide

The Future of climate intervention research - an early career gathering

Geoengineering Info @geoengineering1.bsky.social · Sep 6

7️⃣ SimpliFlying explainer links volcanic cooling to SAI aviation delivery options & risks
simpliflying.com/reports/sola...

8️⃣ Climate Intervention Network plans early-career gathering in Helsinki, Oct 21-22
docs.google.com/forms/d/e/1F...

5/7

The Climate Intervention Network* (CIN), an initiative of the Alliance for Just Deliberation on Solar Geoengineering, will be gathering in-person (!) for the first time in Helsinki, Finland, on the 21...

docs.google.com

Geoengineering Info @geoengineering1.bsky.social · Sep 6

5️⃣ AMOC decline could be slowed or avoided if SAI is injected in the NH, location proves decisive, says study
agupubs.onlinelibrary.wiley.com/doi/10.1029/...

6️⃣ Researchers propose framework to guide SRM field trials & governance oversight
essopenarchive.org/doi/full/10....

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essopenarchive.org

Four more SRM modelling teams receive grant extensions

Geoengineering Info @geoengineering1.bsky.social · Sep 6

3️⃣ UNEP to host global SRM workshop online Sept 9-10, gathering governments & civil society
www.unep.org/events/works...

4️⃣ Degrees Initiative renews SRM funding for Jamaica, Nigeria, Uganda & Mali teams
www.degrees.ngo/continuation...

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Teams from Jamaica, Nigeria, Mali and Uganda have been awarded more funding to continue their research for another two years.

www.degrees.ngo