Re: [HPAC] Zoom review of my "What If Explorer" tentatively set for 11 AM EST Monday November 3rd

[John Nissen]

Hi Bruce,

The costs would go up dramatically after a collapse of any one of the five Arctic tipping elements*, each likely to be triggered (to the point of no return) by reaching 2C, if not before.  This is why it is so urgent to start applying cooling interventions to refreeze the Arctic, even before applying them to other parts of the planet.

Cheers, John

*Arctic tipping elements

Since 1980 the Arctic has been warming around four times faster than the global average.  Five elements of the Arctic have been categorised as tipping elements in the Earth System:

• the Arctic sea ice; 
• the Greenland Ice Sheet; 
• the Arctic permafrost, both on land and under the seabed; 
• the polar jet stream; 
• the Atlantic Meridional Overturning Circulation (AMOC). 

See Steffen et al, 

https://www.pnas.org/doi/pdf/10.1073/pnas.1810141115

On Sat, Oct 25, 2025 at 10:52 PM <br...@chesdata.com> wrote:

Zoom link: https://us02web.zoom.us/j/87649424239?pwd=Zi9XTTRMZXRpcGowRDFKanpSbXF6Zz09 

 

Let me know if you are interested in attending or if another date would be better.

 

Cheers!

 

Bruce Parker

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