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12:41 AM

Minutes of June 29, 2026 HPAC Steering Circle Meeting

The HPAC SC met on July 13, 2026. Approved minutes of the last SC June 29, 2026 meeting (and earlier

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Minutes of June 29, 2026 HPAC Steering Circle Meeting

The HPAC SC met on July 13, 2026. Approved minutes of the last SC June 29, 2026 meeting (and earlier

12:41 AM

Clive Elsworth, … Sander Epema18

Jul 16

Ted Nordhaus: Why I Oppose Solar Geoengineering

Exactly my thoughts, here's my two cents in response: Ted's governance concerns deserve

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Ted Nordhaus: Why I Oppose Solar Geoengineering

Exactly my thoughts, here's my two cents in response: Ted's governance concerns deserve

Jul 16

Ron Baiman, … rob...@rtulip.net4

Jul 16

Please subscribe to, and (if so inclined) comment in, HPAC YouTube Channel

Liking videos also improves their visibility. There are some superb conversations, well worth

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Please subscribe to, and (if so inclined) comment in, HPAC YouTube Channel

Liking videos also improves their visibility. There are some superb conversations, well worth

Jul 16

Jul 16

The Strongest El Niño Ever

FYI: https://www.theclimatebrink.com/p/the-strongest-el-nino-ever

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The Strongest El Niño Ever

FYI: https://www.theclimatebrink.com/p/the-strongest-el-nino-ever

Jul 16

Jul 16

THE VERGE: The first sunlight reflecting space mirror has been cleared for launch

Colleagues, This is somewhat concerning, particularly if the flat mirror could readily be turned into

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THE VERGE: The first sunlight reflecting space mirror has been cleared for launch

Colleagues, This is somewhat concerning, particularly if the flat mirror could readily be turned into

Jul 16

Jul 15

Recording of Laurie Laybourn_Climate tipping point security blind spot_HPAC presentation

Dear Colleagues, Laurie Laybourn_The Security Blind Spot: Climate Tipping Points_ HPAC_Ju... https://

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Recording of Laurie Laybourn_Climate tipping point security blind spot_HPAC presentation

Dear Colleagues, Laurie Laybourn_The Security Blind Spot: Climate Tipping Points_ HPAC_Ju... https://

Jul 15

Robin Collins, … Tim Foresman121

Jul 15

Bulletin of Atomic Scientists: Climate Change: New Data, New Debate

Dear Friends of Earth. I have given much thought and more than a few talks on what I believe are the

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Bulletin of Atomic Scientists: Climate Change: New Data, New Debate

Dear Friends of Earth. I have given much thought and more than a few talks on what I believe are the

Jul 15

Douglas Grandt2

Jul 13

“Cutting fossil fuel emissions is the only thing that changes the path” —Ingmar Rentzhog (Forbes 9 July)

Hans, Excellent comment, especially well placed on Ingmar's photo and post about his invitation

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“Cutting fossil fuel emissions is the only thing that changes the path” —Ingmar Rentzhog (Forbes 9 July)

Hans, Excellent comment, especially well placed on Ingmar's photo and post about his invitation

Jul 13

br...@chesdata.com

Jul 12

Developing our own set of "right questions"

I had originally thought trying to reach a consensus of a plurality of climate scientists on the

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Developing our own set of "right questions"

I had originally thought trying to reach a consensus of a plurality of climate scientists on the

Jul 12

Jul 12

Fwd: 🌎 VCN: Dangerous Humid Heat

Hi all, There's an interesting graph on dangerous humid heat days which are on a dramatic

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Fwd: 🌎 VCN: Dangerous Humid Heat

Hi all, There's an interesting graph on dangerous humid heat days which are on a dramatic

Jul 12

Ron Baiman, rob...@rtulip.net4

Jul 10

3:00 -4:30 PM EDT July 9 Laurie Laybourn HPAC Presentation_The Security Blind Spot: The New Climate Reality and Tipping Points

Dear Colleagues, This link to the draft recording will hopefully work for you if you're having

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3:00 -4:30 PM EDT July 9 Laurie Laybourn HPAC Presentation_The Security Blind Spot: The New Climate Reality and Tipping Points

Dear Colleagues, This link to the draft recording will hopefully work for you if you're having

Jul 10

Jul 10

Amazon forest fires reduce transpiration cooling, major CDR feedback

Amazonian forest fires not only put CO2 into the air, they amplify global warming by greatly reducing

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Amazon forest fires reduce transpiration cooling, major CDR feedback

Amazonian forest fires not only put CO2 into the air, they amplify global warming by greatly reducing

Jul 10

Clive Elsworth, … rob...@rtulip.net5

Jul 9

Coal - sobering reading

The 2025 slowdown in China's coal use was just a blip. See this article. China's coal power

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Coal - sobering reading

The 2025 slowdown in China's coal use was just a blip. See this article. China's coal power

Jul 9

Robert Chris, … rob...@rtulip.net6

Jul 9

I am very interested in using WTF. It is the best source I have seen to analyse the required balance

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I am very interested in using WTF. It is the best source I have seen to analyse the required balance

Jul 9

Jul 9

Re: Misconceptions

Hi NOAC meeting attendees to be, Further to my discussion below with Clive, for our forthcoming NOAC

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Re: Misconceptions

Hi NOAC meeting attendees to be, Further to my discussion below with Clive, for our forthcoming NOAC

Jul 9

Jul 8

Rafe Pomerance tribute and remembrance

As most of you heard, Rafe Pomerance passed away a few weeks ago. Rafe was an early member of HPAC

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Rafe Pomerance tribute and remembrance

As most of you heard, Rafe Pomerance passed away a few weeks ago. Rafe was an early member of HPAC

Jul 8

Clive Elsworth, … oswald....@hispeed.ch251

Jul 8

Reminder: The next NOAC meeting is tomorrow: Monday 13th May (Aus: Tue 14th, 6am AEST)

Hi Glenn, Iron Fertilization is great. The best way to do it is to combine it with EAMO (Enhanced

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Reminder: The next NOAC meeting is tomorrow: Monday 13th May (Aus: Tue 14th, 6am AEST)

Hi Glenn, Iron Fertilization is great. The best way to do it is to combine it with EAMO (Enhanced

Jul 8

Jul 7

Submit a Comment About The Science-Destroying Proposed OMB Rules

https://www.linkedin.com/posts/heads-up-if-you-havent-submitted-a-comment-share-7479976840028344320-

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Submit a Comment About The Science-Destroying Proposed OMB Rules

https://www.linkedin.com/posts/heads-up-if-you-havent-submitted-a-comment-share-7479976840028344320-

Jul 7

Jul 7

Lake Powell, a vital reservoir, plunges toward unprecedented low levels as water crisis deepens in US west

FYI: https://www.theguardian.com/us-news/2026/jul/07/lake-powell-water-crisis

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Lake Powell, a vital reservoir, plunges toward unprecedented low levels as water crisis deepens in US west

FYI: https://www.theguardian.com/us-news/2026/jul/07/lake-powell-water-crisis

Jul 7

Michael MacCracken

Jul 6

Fwd: [GeoMIP_list] SRM sessions in AGU 2026 Meeting to be held in San Francisco in December

I thought this message might be of interest in the event that you have something to present. Best

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Fwd: [GeoMIP_list] SRM sessions in AGU 2026 Meeting to be held in San Francisco in December

I thought this message might be of interest in the event that you have something to present. Best

Jul 6

Philip Bogdonoff, Robin Collins2

Jul 6

First experiment to thicken Arctic ice with seawater shows promise — but there's a big catch | Live Science

“to blot out the sun”…. I read this irresponsible hyperbole and move on. Robin On Mon, Jul 6, 2026 at

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First experiment to thicken Arctic ice with seawater shows promise — but there's a big catch | Live Science

“to blot out the sun”…. I read this irresponsible hyperbole and move on. Robin On Mon, Jul 6, 2026 at

Jul 6

John Nissen, … DrPete Sudbury8

Jul 6

Global heat stress intensification and its expanding footprint

Hi Doug, Thanks for those jet stream shots: very revealing. I expect forecasters follow jet stream

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Global heat stress intensification and its expanding footprint

Hi Doug, Thanks for those jet stream shots: very revealing. I expect forecasters follow jet stream

Jul 6

Michael MacCracken

Jul 2

Fwd: [geo] [AGU26] Call for Abstracts - GC033 - Constraining Climate Intervention Impacts Using Observations Following Natural Analogs and Laboratory Experiments

Abstract Submission for December AGU Meeting in San Francisco. Best, Mike MacCracken --------

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Fwd: [geo] [AGU26] Call for Abstracts - GC033 - Constraining Climate Intervention Impacts Using Observations Following Natural Analogs and Laboratory Experiments

Abstract Submission for December AGU Meeting in San Francisco. Best, Mike MacCracken --------

Jul 2

Jul 2

https://www.globalcoral.org/bikini-blasted-and-forgotten-for-80-years/

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https://www.globalcoral.org/bikini-blasted-and-forgotten-for-80-years/

Jul 2

John Nissen, … Glenn Weinreb10

Jul 2

AI on realistic policy options

Getting too hot? Consider setting up an International Climate Laboratory, tasked with solving the

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AI on realistic policy options

Getting too hot? Consider setting up an International Climate Laboratory, tasked with solving the

Jul 2

Jul 1

3:00 -4:30 PM EST July 9 Laurie Laybourn HPAC Presentation_The Security Blind Spot: The New Climate Reality and Tipping Points

Dear Colleagues, Zoom link for July 9 3:00 pm EDT Laurie Layton HPAC meeting: https://benu.zoom.us/j/

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3:00 -4:30 PM EST July 9 Laurie Laybourn HPAC Presentation_The Security Blind Spot: The New Climate Reality and Tipping Points

Dear Colleagues, Zoom link for July 9 3:00 pm EDT Laurie Layton HPAC meeting: https://benu.zoom.us/j/

Jul 1

Jul 1

Minutes of June 15, 2026 HPAC Steering Circle Meeting

Dear Colleagues, It has been suggested that we send a note like the one below after each SC meeting.

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Minutes of June 15, 2026 HPAC Steering Circle Meeting

Dear Colleagues, It has been suggested that we send a note like the one below after each SC meeting.

Jul 1

Jul 1

Fwd: State of Climate Tech H1'26: Live Walkthrough

---------- Forwarded message --------- From: Net Zero Insights <in...@netzeroinsights.com> Date:

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Fwd: State of Climate Tech H1'26: Live Walkthrough

---------- Forwarded message --------- From: Net Zero Insights <in...@netzeroinsights.com> Date:

Jul 1

Michael MacCracken

Jun 30

Fwd: Synthesis by Berkeley Earth is now live

I thought this would be of interest given the global capability that they are offering. Mike

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Fwd: Synthesis by Berkeley Earth is now live

I thought this would be of interest given the global capability that they are offering. Mike

Jun 30

Jun 30

A Foreign Policy Case for “Climate Stabilisation”

At the end of the article linked to below is an opportunity to register for a panel that begins in

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A Foreign Policy Case for “Climate Stabilisation”

At the end of the article linked to below is an opportunity to register for a panel that begins in

Jun 30

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