Weekly Solar Geoengineering Updates (27 October - 02 November 2025)
Weekly SRM roundup of research papers, web posts, events, jobs, projects, podcasts, videos and much more.
1. This Week’s Top SRM Highlights
2. Research Papers
3. Thesis
4. Web Posts
5. YouTube Videos
6. Upcoming Events
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RESEARCH PAPER: A climate risk management typology: Integrating approaches to reduce risk (Sage Journal)
PERSPECTIVE: In support of geoengineering (The Guide to a Gigaton)
GOVERNMENT’S STANCE: German gov’t firm on rejecting solar radiation management as climate policy option (Clean Energy Wire)
VIDEO: SRM & Development: Estimating the Upside, Confronting the Limits (Paris Peace Forum)
EVENT RECORDING: Climate Reckoning in ATLAS25 - James Hansen & Clare Farrell (Operaatio Arktis)
Read on to unpack more updates:
Impacts of solar radiation modification on precipitation extremes in Central China
Authors: Zeqian Feng, Mou Leong Tan, Mohd Amirul Mahamud, Shiyuan Cheng & Chenglei Hou
Synopsis: This study examines how Solar Radiation Modification affects late-21st-century precipitation in Central China using GeoMIP6 simulations. Under SSP585, total rainfall and extremes rise sharply, while SSP245 shows milder change. SRM scenarios offset intense increases, with G6sulfur showing stronger, more uniform suppression than G6solar. Regional differences persist, altering wet periods in southern monsoon areas and boosting rainfall in northern provinces.
Authors: Tianbao Wu, Xueping Fan, Chao Wang, Guozhi Jia
Synopsis: This study develops a selectively transparent photothermal membrane for solar radiation management in building windows using a tannic acid-grafted Cu1.95S/MoS2 heterojunction. It reduces solar transmittance by 25.3% with minimal light loss, raises photothermal temperature by 23.4 °C, enhances UV and NIR absorption, prevents fogging, and generates stable voltage, supporting next-generation sustainable window design.
A climate risk management typology: Integrating approaches to reduce risk
Authors: Camilla Hyslop , Tristram Walsh, Estelle Paulus, and Michael Obersteiner
Synopsis: This study addresses the growing need for integrated climate risk management as overshoot becomes more likely. It introduces a qualitative typology to clarify how different climate interventions interact across varied risk scenarios. Demonstrated through six intervention portfolios, the framework helps practitioners understand how combined strategies can reduce loss and damage. It expands existing tools by explicitly framing them around risk and applying them to diverse future climate contexts.
Authors: Matthew Henry, Alistair Duffey
Synopsis: This response challenges Siegert et al. (2025) for presenting an incomplete picture of polar climate interventions, particularly SAI. It argues that evidence shows SAI can cool polar regions year-round, even with low-latitude injection, and that potential benefits, such as reduced ecosystem stress and tipping-point risks, were overlooked. While acknowledging risks, it stresses that research remains essential to fully assess limitations and inform future decisions, complementing, not replacing, emissions cuts.
Mitigation of Ultraviolet Solar Radiation Involving Calcite (MUSIC) - Preprint
Authors: Tanvi Nare, Prachi Prashant Thakkar, Darshini Kumar, Somya Mulla
Synopsis: This study tests calcite powder as an eco-friendly solar radiation management material by measuring its ability to block UV light on a high-altitude balloon payload. Laminated sheets with different calcite concentrations were evaluated using onboard sensors. Both calcite-treated sheets reduced UV exposure compared to the control, supporting further research into calcite and similar materials for potential use in stratospheric aerosol injection.
Understanding Forced Pacific Climate Responses with Large Ensembles - Thesis
Authors: Xing, Chen
Synopsis: This dissertation separates forced climate signals from internal variability using large ensembles. It finds no significant anthropogenic change in Pacific Decadal Variability when mean state trends are properly removed. Marine cloud brightening strongly suppresses ENSO by altering Pacific conditions, posing hydroclimate risks. Marine heatwave intensity rises mainly due to mean warming, and recent Northeast Pacific warming is largely internal variability. Accurate mean state representation is crucial.
SilverLining - SilverLining Statement on the Funding Announcement of Atmospheric Intervention Company Stardust Solutions
Wyoming News - Lawmakers advance ‘geoengineering’ ban following concerns of harmful ‘chemtrails’
The Guide to a Gigaton - In support of geoengineering
LinkedIn - Why We are Conducting Geoengineering Research
The Degrees Initiative - Second Latin American and Caribbean SRM workshop fosters connections among experts
My Joy Online - Ghanaian youth affirm African leadership on climate justice, call for global non-use agreement on solar geoengineering
Science Feedback - Myths about weather control and geoengineering: here’s what you should know
Wyoming Public Media - ‘Chemtrail’ conspiracy guides Wyoming ‘geoengineering’ legislation
SRM360 - For-Profit Startup Secures $60 Million for Climate Cooling Technology
Clean Energy Wire - German gov’t firm on rejecting solar radiation management as climate policy option
Matt Blythe - Venture capital / startups x geoengineering
DSG - Strengthening Regional Capacity on SRM Governance: Reflections from our Collaborative Workshop in Bogota
Press Kit - Geoengineering: The European Commission decides, states pay, but have no say. The response to a question from the German government
Cepa - Cooling The Planet: The Geoengineering Gambit
WV News - Claims ‘chemtrails’ poison citizens spur Wyoming lawmakers to advance ‘geoengineering’ ban
Prospect - Scientists want to block out the sun. How worried should we be?
Co-CREATE Seminar: Exploring Governance Analogues for SRM Research | Climate Strategies
Climate Politics When It’s Too Late with Wim Carton | Climate Chat
“In this Climate Chat episode, we interview author and professor Wim Carton about his new book, co-authored with Andreas Malm, titled: “The Long Heat: Climate Politics When It’s Too Late.” The book focuses on climate adaption, negative emissions, and solar geoengineering and critiques them for being used as excuses to avoid rapid emissions reduction.”
Discover Climate Repair: Is this for real? with Mark Symes and Jane List | Centre for Climate Repair
The Nature of the Future | American Academy in Berlin
“We live in a physical world transformed by human actions. Increasingly, we are confronted with their unhappy consequences: climate change, species loss, degradation of ecosystems. Should we intervene again? Should we try to counteract the effects of our previous interventions? In this talk, Elizabeth Kolbert discusses possible interventions, which include genetic engineering of endangered species and solar geoengineering.”
James Hansen & Clare Farrell - Climate Reckoning in ATLAS25 | Operaatio Arktis
“James Hansen—the NASA scientist who first alerted the world to climate change in 1988—brings groundbreaking findings that explain why global temperatures suddenly spiked in 2023-2024, leaving even climate scientists baffled. His research reveals that we’ve entered a period of accelerated warming that changes everything we thought we knew about climate timelines.
In conversation with Clare Farrell, co-founder of Extinction Rebellion UK, Hansen present evidence that the climate science community has been systematically underestimating both the speed and scale of change. Together, they’ll explore why current climate assessments miss critical signals and what this means for our situation and the tools needed to address it.
Following Hansen’s 30-minute presentation, Farrell lead an interview about what these findings mean for our societies, our souls, our politics, and the movements fighting for climate justice. If we have entered a new era of human and planetary history, what is asked of us as communities, as institutions, or as a species?”
Could Solar Geoengineering Help or Harm the Amazon? | SRM360
“On 28 October 2025, SRM360 hosted a live discussion on the Amazon, its decline, and what impacts solar geoengineering could have on the rainforest. Watch the recording to explore this topic with expert panellists Dr Thelma Krug, Dr Marcos Regis Silva, and Prof. Peter Cox.”
SRM & Development: Estimating the Upside, Confronting the Limits | Paris Peace Forum
“This Climate Overshoot Commission session will explore how Solar Radiation Management (SRM) could reduce climate-related harms and ease pressures on vulnerable economies, while recognizing the limits, risks, and governance challenges that keep it a research topic rather than a policy tool. It will examine the latest evidence on its social and economic impacts, distributional impacts across countries, and the uncertainties that shape how SRM research should be designed and interpreted. The session will aim to clarify what further research would require, ensuring that knowledge generated serves developing-country priorities without undermining mitigation.”
Uncertain Skies: Why Measuring Aerosols Matters | HARMONIA COST
“Tiny particles in our air—dust, smoke, sea salt, sulfates—shape climate, health, energy, and aviation. This short film explains why aerosol measurement stability, continuity, and harmonization are crucial to detect real long-term trends, validate satellites, and make smarter policy decisions. Created within the HARMONIA (COST Action CA21119) community.”
3-7 November | Pune, India - 11th WMO Scientific Conference on Weather Modification
13 November | New York - Documentary Plan C For Civilization World Premiere
14 November | Online - Planetary Sunshade Foundation - annual update by Planetary Sunshade Foundation
14 - 30 November | Online - Documentary Plan C For Civilization World Premiere
15 November | New York - Documentary Plan C For Civilization World Premiere
01 December | Online & In-person (UK) - Good COP, Bad COP: First reflections on COP30 by Centre for Climate Repair
15-19 December | New Orleans, Louisiana - 2025 American Geophysical Union Meeting
9-13 March 2026 | Kyoto, Japan - CMIP Community Workshop (CMIP26)
21-26 June 2026 | United States - Gordon Research Conference - Bridging Observations, Models, and Impacts in Solar Radiation Modification Research
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