Skip to main content


CRITICAL

SCIENCE


Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors

HPAC Endorsed Articles
and Videos

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

By 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…
Read More

HPAC Videos

HPAC Popular Press, Journal Articles and Conference Posters

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

By 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…
Read More

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

By 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.…
Read More

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

By 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…
Read More

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

By 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, …
Read More

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

By 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…
Read More

HPAC Slide Presentations and White Papers

Open Letter to the International Maritime Organization

By 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…
Read More

HPAC Actions

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

By 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…
Read More

Healthy Planet Action Coalition

An international group of climate scientists, engineers, entrepreneurs, and policy and advocacy experts

Terms of Use | Privacy PolicyContact
We are an international organization located on Planet Earth, third planet from our sun in the Milky Way Galaxy.
Website design and all images and video by Bruce Melton unless otherwise attributed – free use with permission.
V2 Beta Site – See the old site here.