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

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🧵7/7

9️⃣ Plan C for Civilization debuts at @docnycfest.bsky.social, highlighting SRM science, risks, governance, and public debate

🔟 Resources from the 2025 SRM Social Science Workshop by @rff.org & Harvard now available online

6/7

7️⃣ Columbia University study warns that SAI may face far greater practical limits than models suggest

8️⃣ @degrees.ngo releases proceedings from the largest SRM gathering to date

5/7

5️⃣ Reflective funds eight projects on high-latitude, low-altitude SAI impacts across ecosystems

6️⃣ Global Tipping Points Report 2025 notes key climate systems near irreversible thresholds and calls for an SRM deployment moratorium, citing risks and uncertainties

4/7

3️⃣ Elon Musk proposes an AI satellite shield to modulate sunlight, sparking governance alarms

4️⃣ @newscientist.com Survey: 66% of 120 IPCC contributors expect SRM attempts by 2100; 81% want a global treaty

3/7

📰Top 10 SRM Highlights:

1️⃣ Stardust raises a record $60M Series B to build a solar-reflecting system by 2030, planning outdoor particle tests in 2026; igniting transparency concerns

2️⃣ International positions on SRM harden amid state-level bans, probes, and non-use calls

2/7