stratospheric aerosols – Healthy Planet Action Coalition

aerosols Arctic refreezing cryosphere Engineered cooling geoengineering Ice Sheets solar radiation modification SRM stratospheric aerosols

Greg Slater -Update on a Proposal for a First Antarctic SAI Test (FAST), HPAC, February 5, 2026

https://www.youtube.com/watch?v=i21bLM5Kebc Greg Slater -Update on a Proposal for a First Antarctic SAI Test (FAST), HPAC, February 5, 2026 Greg Slater will be presenting an "Update On a Proposal For the 'First Antarctic SAI Test' (FAST)”. He will be discussing the need to have the first tests of SAI…

HPACAdminFebruary 5, 2026

1 degree C warming above normal 30 degrees north and south 350 ppm CO2 aerosols albedo Arctic refreezing atmospheric greenhouse gas concentration carbon burden carbon cycle response Carbon removal climate restoration climate triad clouds Cooling intervention governance implementation direct air capture Earth systems Earth's energy imbalance Engineered cooling Engineered cooling scenarios engineered cooling strategy response geoengineering Marine cloud brightening natural feedback emissions natural geoengineering negative emissions Ocean acidification Ocean response presentation Risk-Risk Analysis sequestration ship's fuels regulations solar radiation modification SRM stratospheric aerosols Temperature response threshold crossing tipping tropospheric aerosols warming in the pipeline

Global Heating Emergency Conference by HPAC, October 15 and 16, 2025

https://youtu.be/OTlZ4lQ5Evc?si=jUFm4ufvhsmL6knr Global Heating Emergency Conference by HPAC, October 15 and 16, 2025 Global Online Conference • October 15 – 16, 2025 (https://www.preventing2degrees.org) Description: In Paris in 2015, 195 countries committed to stopping global warming. But greenhouse gas emissions have continued to relentlessly increase. The latest science shows…

HPACAdminDecember 5, 2025

atmospheric greenhouse gas concentration carbon balance carbon burden Carbon Capture and Storage Carbon removal carbon sinks climate restoration climate triad direct air capture Earth systems Engineered cooling engineered cooling strategy response geoengineering natural geoengineering negative emissions presentation sequestration solar radiation modification SRM stratospheric aerosols

Paul Gambill – New Initiatives to Support Comprehensive Approaches to Controlling Global Heating, HPAC, November 13, 2025

https://www.youtube.com/watch?v=qK_dMzE7m5Q Paul Gambill - New Initiatives to Support Comprehensive Approaches to Controlling Global Heating, HPAC, November 13, 2025 Paul Gambill will be joining us to discuss his work on educating the public to understand that sunlight reflection methods will be needed in addition to emissions reductions and greenhouse…

HPACAdminNovember 13, 2025

climate restoration Cooling intervention governance implementation presentation solar radiation modification SRM stratospheric aerosols Uncategorized

How Climate Intervention can Safely and Quickly Cool the Planet, HPAC NYC Climate Week, Sep. 26, 2025

https://www.youtube.com/watch?v=mz2_mRqHZuw How Climate Intervention can Safely and Quickly Cool the Planet, HPAC NYC Climate Week, Sep. 26, 2025 Presentation (accompanying Baiman talk on near-term cooling): https://docs.google.com/presentation/d/1JQ... Delay in action to limit climate pollution has allowed end of century scenarios to prematurely initiate. Earth systems have begun to degrade…

HPACAdminOctober 8, 2025

aerosols albedo Cooling intervention governance implementation methane near-term cooling non-CO2 greenhouse gases presentation solar radiation modification SRM stratospheric aerosols

Community Discussion of Cynthia Sharf podcast and near-term cooling governance, HPAC, September 18, 2025

https://www.youtube.com/watch?v=NjSEwmIBph4 Community Discussion of Cynthia Sharf podcast and near-term cooling governance, HPAC, September 18, 2025 Cynthia Scharf is Senior Fellow - Climate Interventions at the Centre for Future Generations, steering our work on climate intervention technologies and briefing senior climate officials in the EU and globally on the…

HPACAdminSeptember 18, 2025

aerosols Engineered cooling engineered cooling strategy response geoengineering presentation solar radiation modification SRM stratospheric aerosols

Brian Soden – Climate Geoengineering: A Bad Idea Whose Time Has Come? HPAC, August 21, 2025

https://www.youtube.com/watch?v=kMK8DJQGGTw Brian Soden - Climate Geoengineering: A Bad Idea Whose Time Has Come? HPAC, August 21, 2025 We will be joined by Brian Soden who will share his reflections on his recent research paper stratospheric aerosol injection with black carbon: https://www.nature.com/articles/s43247-025-02466-z Brian Soden is a Professor of Atmospheric…

HPACAdminAugust 21, 2025

30 degrees north and south Engineered cooling Engineered cooling scenarios Learn by doing stratospheric aerosols

First Simulations of Designing Stratospheric Sulfate Aerosol Geoengineering to Meet Multiple Simultaneous Climate Objectives

Summary... First simulations of stratospheric sulfate injection at 30 degrees N and S, RCP8.5, +/-5 degree C warming, 51 million tons SO2 annually… Of note: scenarios overcool in summer and undercool in winter. Kravits, McMartin et al., First Simulations of Designing Stratospheric Sulfate Aerosol Geoengineering to Meet Multiple…

HPACAdminJune 10, 2025

Engineered cooling Engineered cooling scenarios stratospheric aerosols

How large is the design space for stratospheric aerosol geoengineering

First published in Earth Systems Dynamics, January 25, 2022. Summary... Managing multiple climate goals simultaneously with stratospheric aerosol cooling. Small cooling is easier than large cooling with more choices of strategies available. Zhang and MacMartin et al., How large is the design space for stratospheric aerosol geoengineering, Earth…

HPACAdminJune 10, 2025

Arctic refreezing Engineered cooling Marine cloud brightening stratospheric aerosols Uncategorized

Five geoengineering trials the UK is funding to combat global warming

UK Government is funding five, small scale geoengineering field experiments: three on marine cloud brightening, and one each on Arctic refreezing, and stratospheric aerosols totalling $78 million U.S. The article advocates for the common understanding of the nature of geoengineering in academic and public thought, "Deliberately altering the…

HPACAdminJune 10, 2025

1 degree C warming above normal 350 ppm CO2 Carbon removal climate restoration clouds Earth's energy imbalance Engineered cooling natural feedback emissions negative emissions ship's fuels regulations solar radiation modification SRM stratospheric aerosols tipping

Hansen et al., Global Warming Has Accelerated: Are the United Nations and the Public Well-Informed? Review by Bruce Melton PE

Hansen 2025 - review by Bruce Melton, Climate Change Now Initiative Summary - Hansen's 350 ppm CO2 and 1 degree C warming target is on full display where he repeatedly asserts that acceleration of warming and effects now implies that engineered cooling solutions are required to avoid untenable…

HPACAdminFebruary 20, 2025