‘Termination shock’: trust our expert warnings on geoengineering’s planetary risks, by Raymond Pierrehumbert, Julia Slingo, Michael Mann and Valerie Masson-Delmotte

[Alan Robock]

https://www.theguardian.com/commentisfree/2026/jun/19/solar-geoengineering-risk-to-planet-earth

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Alan Robock

Alan Robock, Distinguished Professor
   Editor, Reviews of Geophysics (Impact Factor 38.5)
Department of Environmental Sciences         Phone: +1-848-932-5751
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[Veli Albert Kallio]

I support Alan's caution, but wish to remind all that there are no easy options and we are already on untreaded waters with our climate.

It is important to understand too that we should also think there is Holocene Termination Shock.

Namely, adding greenhouse gases endlessly like President Donald Trump is wishing to do, will end in sudden tears.

Climate change in the past has had abrupt termination points, gradual climate change cannot be extrapolated ad infinitum.

Recent collapses of huge mountains in Switzerland and Alaska (as permafrost ice seams have melted soft) harbinger bigger ones.

Melville Bay sector is literally pile of rubble glued together by ice (permafrost ice binding) it collapses on steep sea slope and creates strait.

Ice free Arctic Ocean is likely to bring about the Last Dryas sudden cooling as ice berg armadas fill ocean between America and Europe.

But agriculture and forests are already at great risk - in addition to sudden sea level rise jump if huge ice shelves / ice sheets crumble.

A terrestrial ice sheet can be turned into a floating ice shelf that sits on sloping land thrusted by gravity and pinned by ground obstacles.

Too much melt water beneath ice sheet, and suddenly Holocene Termination from GHG emissions materialises with towns, ports and nuclear reactors flooded with violent climatic swings.

Other risks from anoxic ocean to drying rainforests all can materialise in addition to methane and nitrous oxide injections from melted cryosphere seafloor and tundra.

Sea Research Society

Environmental Affairs

c/o Veli Albert Kallio, Vice President SRS

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From: 'Alan Robock' via geoengineering <geoengi...@googlegroups.com>
Sent: 19 June 2026 15:51
To: Geoengineering <Geoengi...@googlegroups.com>
Subject: [geo] ‘Termination shock’: trust our expert warnings on geoengineering’s planetary risks, by Raymond Pierrehumbert, Julia Slingo, Michael Mann and Valerie Masson-Delmotte

 

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