Critical Science – Healthy Planet Action Coalition

HPAC Endorsed Articles
and Videos

Sep 27

Plan A+: Stratospheric aerosol injection’s potential role alongside other climate policies, June 2025

By HPACAdmin HPAC endorsed articles and videos

https://www.youtube.com/watch?v=M13nf0UpI2c Plan A+: Stratospheric aerosol injection's potential role alongside other climate policies June 2025: Dr. Peter Irvine at the 2025 Arctic Repair Conference. Stratospheric aerosol injection's potential role alongside other climate policies.

Aug 21

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Dr Peter Irvine at the 2025 Arctic Repair Conference, July 16, 2025

By HPACAdmin critical science, HPAC endorsed articles and videos

Peter Irvine, University of Chicago - Stratospheric aerosol injection's potential role alongside other climate policies: understanding the climate and earth system response to solar geoengineering, evaluating the effectiveness and risks of solar geoengineering proposals, exploring the broader implications of solar geoengineering.

Jul 31

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The Positive Case For Global Cooling That Few Seem Willing to Make

By HPACAdmin HPAC endorsed articles and videos

The Positive Case For Global Cooling That Few Seem Willing to Make Paul Gambill Jul 31, 2025 The Temperature Stabilization Imperative - I spent a decade building carbon removal infrastructure, believing we could scale our way out of the climate crisis. The math proved me wrong. In a more…

Jun 25

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Herb Simmens at London Climate Week: “The Climate Triad: Restoring a Safe and Healthy Climate,” June 25, 2025

By HPACAdmin HPAC endorsed articles and videos

Herb Simmens at London climate Week presents,"The Climate Triad: Restoring a Safe and Healthy Climate" in this powerful talk recorded at the Foundling Museum, London, on Monday, June 23, 2025, during London Climate Action Week 2025. As co-leader of Montgomery County’s historic 2017 climate emergency declaration—the first in…

Jul 23

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How the Climate Triad Can Effectively Address the Planetary Polycrisis – HPAC 3 min video

By HPACAdmin critical science, HPAC endorsed articles and videos

Short Video for the Council for the Human Future Cool, Reduce, Remove - 3:13 mins Link to presentation A presentation by Robert Tulip, HPAC Steering committee member. https://rtulip.net/about

HPAC Videos

May 15

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2.5ºC–3ºC Is Not Viable: Dr. Mike MacCracken’s Case for Solar Radiation Management

By HPACAdmin HPAC Videos

2.5ºC–3ºC Is Not Viable: Dr. Mike MacCracken's Case for Solar Radiation Management May 15, 2025 ClimateGenn #podcast produced by Nick Breeze In this ClinateGenn episode I am speaking with Dr Mike MacCracken, a pioneering climate scientist whose research on atmospheric physics and global climate change has significantly advanced…

Jul 15

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The Climate Triad Healthy Planet Action Coalition, July 15, 2024

By HPACAdmin HPAC Videos

The Climate Triad July 2024. HPAC Short Video for the Roundtable on the Human Future (See: https://humanfuture.org/).

HPAC Popular Press, Journal Articles and Conference Posters

Jan 13

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December 15, 2025 – American Geophysical Union Poster – SAI Deployment and Risks to Human Civilization

By HPACAdmin HPAC Popular Press, Journal Articles, Conference Proceedings

SAI Deployment and Risks to Human Civilization: The Question is No Longer If, but How, When, Where, and by Whom? Ron Baiman (rpbaiman@gmail.com), Healthy Planet Action Coalition (HPAC) and Benedictine University; Michael C. MacCracken (mmaccrac@comcast.net), Healthy Planet Action Coalition and the Climate Institute; Gregory Slater (tenkyuu@gmail.com), Healthy Planet Action…

Jun 19

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The Hill, June 19, 2025 – Earth is absorbing too much sunlight: It’s a waking climate giant, by Robert Tulip

By HPACAdmin HPAC Popular Press, Journal Articles, Conference Proceedings

Albedo is the reflection of sunlight back into space, mainly from bright surfaces such as clouds, snow, ice and atmospheric particles, providing an essential planetary cooling shield. However, a 2021 NASA study found that the excess of incoming sunlight over outgoing radiation, known as Earth’s energy imbalance, has doubled since 2005.…

Dec 09

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December 9, 2024 – American Geophysical Union Poster – A Credible International Approach to Limiting Climate Change Impacts

By HPACAdmin HPAC Popular Press, Journal Articles, Conference Proceedings

A Credible International Approach to Limiting Climate Change Impacts Requires Supplementing Emissions Reduction and GHG Removal with Near-Term Climate Intervention American Geophysical Union Conference Poster Presentation by Michael C. MacCracken (mmaccrac@comcast.net), Healthy Planet Action Coalition (HPAC) and Ron Baiman (rpbaiman@gmail.com), Healthy Planet Action Coalition (HPAC) Human-Induced Warming…

Aug 12

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Addressing the urgent need for direct climate cooling: Rationale and options, Oxford Open

By HPACAdmin HPAC Popular Press, Journal Articles, Conference Proceedings

Addressing the urgent need for direct climate cooling: Rationale and options Ron Baiman, Sev Clarke, Clive Elsworth, Leslie Field, Michael MacCracken, John Macdonald, David Mitchell, Franz Dietrich Oeste, Suzanne Reed, Stephen Salter, Herb Simmens, Ye Tao, Robert Tulip Oxford Open Climate Change, Volume 4, Issue 1, 2024, …

Jul 04

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An Open Letter to the IMO Supporting Maritime Transport that Cools the Atmosphere While Preserving Air Quality Benefits, Oxford Open

By HPACAdmin HPAC Popular Press, Journal Articles, Conference Proceedings

An Open Letter to the IMO Supporting Maritime Transport that Cools the Atmosphere While Preserving Air Quality Benefits, Oxford Open Ron Baiman, Rebecca Bishop, Clive Elsworth, Alan Gadian, Bruce Melton, Oswald Petersen, Ye Tao Oxford Open Climate Change, Volume 4, Issue 1, 2024, kgae008 Published: 04 July 2024…

HPAC Slide Presentations and White Papers

Nov 11

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Addressing the urgent need for direct climate cooling: Rationale and Options

By HPACAdmin HPAC Slide Presentations and White Papers

Addressing the urgent need for direct climate cooling: Rationale and Options Companion presentation to Baiman 2024

Oct 31

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Direct Climate Cooling (DCC) Coordination and Governance

By HPACAdmin HPAC Slide Presentations and White Papers, Uncategorized

Direct Climate Cooling (DCC) Coordination and Governance Ron Baiman Healthy Planet Action Coalition Presentation, Oct. 2, 2024 Triad statement, tables 1-2 and outline of the “Challenges and opportunities” section in: Baiman et al. Addressing the Urgent Need for Direct Climate Cooling: Rationale and Options. Oxford Open Climate Change.…

Feb 10

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Open Letter to the International Maritime Organization

By HPACAdmin HPAC Slide Presentations and White Papers

Open Letter to the International Maritime Organization - Sulfur Reduction Regulations in Shipping Fuels Have Accelerated Global Warming International Maritime Organization regulations that sharply limit shipping fuel sulfur content to protect human health from harmful sulfur dioxide emissions went into effect in 2020. However, multiple research studies suggest that by…

Jan 08

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Understanding the Urgent Need for Direct Climate Cooling

By HPACAdmin HPAC Slide Presentations and White Papers

Understanding the Urgent Need for Direct Climate Cooling, Slides and Presentation Ron Baiman, Sev Clarke, Clive Elsworth, Leslie Field, Michael MacCracken, John Macdonald, David Mitchell, Franz Dietrich Oeste6suzanne Reed, Stephen Salter, Herb Simmens, Ye Tao, Ro ert Tulip Panel on Climate Justice Union for Radical Political Economics American…

HPAC Actions

Oct 10

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Vision Statement – The Healthy Planet Action Coalition Cool, Reduce and Remove to Restore the Climate

By HPACAdmin HPAC Actions

Vision Statement - The Healthy Planet Action Coalition Cool, Reduce and Remove to Restore the Climate Vision For a Healthy Planet October 10, 2022 The Healthy Planet Action Coalition Steering Circle Herb Simmens, Suzanne Reed, Ron Baiman, Michael MacCracken, Robert Tulip, Brian von Herzen, Leslie Field Endorsements* Subarna Bhattacharya, Climformatics…

Oct 31

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Urgent Action for a Healthy Climate, COP 26, October 31, 2021

By HPACAdmin HPAC Actions

Urgent Action for a Healthy Climate, COP 26, October 31, 2021 COP26: October 31-November 12, 2021 Healthy C Planet Action Coalition Dear COP26 Delegates and Stakeholders, We are an international network of scientists, engineers, physicists, biologists, and public policy experts active in the climate change arena. We are…

Oct 25

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Experts Call for Plan Limiting Global Warming to Below 1°C, COP 26 Press Release

By HPACAdmin HPAC Actions

Experts Call for Plan Limiting Global Warming to Below 1°C Healthy Planet Action Coalition Press Release, COP 26, October 25, 2021 Glasgow. An international network of scientists, researchers, engineers, public policy experts, and activists is calling for urgent global action to reverse climate change and regenerate a healthy…

Jan 26

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Urgent G20 and COP 26 Priorities for a Healthy Climate, January 26, 2021

By HPACAdmin HPAC Actions

Urgent G20 and COP 26 Priorities for a Healthy Climate Healthy Planet Action Coalition January 26, 2021 July 26, 2021 Dear World Leader: We are an international network of scientists, engineers, physicists, biologists, and public policy experts active in the climate change arena. We are calling upon you…

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HPAC Endorsed Articles
and Videos

Plan A+: Stratospheric aerosol injection’s potential role alongside other climate policies, June 2025

Dr Peter Irvine at the 2025 Arctic Repair Conference, July 16, 2025

The Positive Case For Global Cooling That Few Seem Willing to Make

Herb Simmens at London Climate Week: “The Climate Triad: Restoring a Safe and Healthy Climate,” June 25, 2025

How the Climate Triad Can Effectively Address the Planetary Polycrisis – HPAC 3 min video

HPAC Videos

2.5ºC–3ºC Is Not Viable: Dr. Mike MacCracken’s Case for Solar Radiation Management

The Climate Triad Healthy Planet Action Coalition, July 15, 2024

HPAC Popular Press, Journal Articles and Conference Posters

December 15, 2025 – American Geophysical Union Poster – SAI Deployment and Risks to Human Civilization

The Hill, June 19, 2025 – Earth is absorbing too much sunlight: It’s a waking climate giant, by Robert Tulip

December 9, 2024 – American Geophysical Union Poster – A Credible International Approach to Limiting Climate Change Impacts

Addressing the urgent need for direct climate cooling: Rationale and options, Oxford Open

An Open Letter to the IMO Supporting Maritime Transport that Cools the Atmosphere While Preserving Air Quality Benefits, Oxford Open

HPAC Slide Presentations and White Papers

Addressing the urgent need for direct climate cooling: Rationale and Options

Direct Climate Cooling (DCC) Coordination and Governance

Open Letter to the International Maritime Organization

Understanding the Urgent Need for Direct Climate Cooling

HPAC Actions

Vision Statement – The Healthy Planet Action Coalition Cool, Reduce and Remove to Restore the Climate

Urgent Action for a Healthy Climate, COP 26, October 31, 2021

Experts Call for Plan Limiting Global Warming to Below 1°C, COP 26 Press Release

Urgent G20 and COP 26 Priorities for a Healthy Climate, January 26, 2021

Healthy Planet Action Coalition

CRITICAL

SCIENCE

HPAC Endorsed Articles and Videos

HPAC Videos

HPAC Popular Press, Journal Articles and Conference Posters

HPAC Slide Presentations and White Papers

HPAC Actions

Healthy Planet Action Coalition

HPAC Endorsed Articles
and Videos