Climate Moonshot

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rob...@rtulip.net

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Aug 9, 2026, 7:31:58 AM (3 days ago) Aug 9

to Healthy Planet Action Coalition

Glenn Weinreb and I discussed his Climate Moonshot proposal at Project Save The World, with focus on Stratospheric Aerosol Injection

Video: https://projectsavetheworld.substack.com/p/episode-781-climate-moonshot

Summary: https://projectsavetheworld.substack.com/p/about-climate-moonshot .

Glenn’s website: https://www.aplantosavetheplanet.org/

Regards

Robert Tulip

From: Project Save the World from Project Save the World's Substack <projectsa...@substack.com>
Sent: Sunday, 9 August 2026 8:26 AM
Subject: About Climate Moonshot

The Climate Moonshot and Stratospheric Aerosol Injection: A Strategic Analysis

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About Climate Moonshot

Project Save the World

Aug 8

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The Climate Moonshot and Stratospheric Aerosol Injection: A Strategic Analysis

Introduction

As global temperatures continue to rise and the limitations of conventional mitigation strategies become increasingly apparent, unconventional interventions are moving to the center of environmental discourse. In a recent Project Save the World conversation, host Robbie Tulip and entrepreneur-turned-researcher Glenn Weinreb discussed the imperatives of tackling climate change through large-scale research and development (R&D). Weinreb, a graduate of the Massachusetts Institute of Technology who ran his own hardware and software company for 35 years, transitioned away from commercial enterprise six years ago to focus entirely on solving the global climate crisis. Through his nonprofit initiative, Manhattan2, and its associated platform, APlanToSaveThePlanet.org, Weinreb advocates for a “climate moonshot”—a massive surge in research directed toward geoengineering, improved climate modeling, and systemic technological transformations.

The Limitations of Decarbonisation and Accumulated Warming

The dominant consensus within the traditional climate movement focuses heavily on decarbonisation—stopping the use of fossil fuels to curb greenhouse gas emissions. However, Weinreb outlines two structural problems that render decarbonisation alone insufficient as a complete response to the crisis.

The Free-Rider Problem: At both individual and national levels, the direct effect of a single actor reducing emissions is minuscule compared to the global total, creating a powerful economic disincentive to bear costs voluntarily while others do not. Despite economic growth driving cleaner technologies, global carbon dioxide emissions have generally continued to rise because economic expansion pushes them upward.
The Stock versus Flow Problem: Decarbonisation addresses the flow of new emissions rather than the accumulated stock of greenhouse gases already present in the atmosphere. Historical emissions total roughly 1.5 trillion tonnes of carbon dioxide, driving a persistent warming influence that will not disappear simply by slowing the rate of new emissions.

Because past emissions represent a much larger source of ongoing warming than the increment from a single year of new emissions, decarbonisation alone cannot immediately cool the planet. Consequently, supplemental strategies are necessary to address the existing thermal burden.

Glenn Weinreb

The Climate Toolbox: Solar Geoengineering and Modeling

To handle the comprehensive reality of planetary warming, Weinreb suggests that global climate models must accurately assess three distinct tools in the climate toolbox:

1. Decarbonisation: Reducing new greenhouse gas emissions.

2. Carbon Dioxide Removal (CDR): Pulling carbon directly out of the air or ocean via methods like direct air capture or ocean iron fertilisation.

3. Sunlight Reflection: Reflecting a fraction of incoming sunlight back into space using methods such as stratospheric aerosol injection (SAI) or marine cloud brightening.

However, current global climate models lack the precision required to fully anticipate changes in global temperature, warming rates, cloud behaviors, and aerosol reflectivity. Weinreb’s Manhattan2 proposals therefore emphasize a billion-dollar, five-year experimental program explicitly designed to upgrade these predictive global models before full-scale deployment is ever considered.

Robbie Tulip

The Phased Approach to Stratospheric Aerosol Injection

Stratospheric aerosol injection (SAI) involves dispersing reflective particles—such as sulfur dioxide—into the stratosphere to cool the planet by reflecting sunlight. Weinreb outlines a structured, three-phase plan to transition from current conditions to operational readiness over a 15-year horizon:

Phase One (Research and Development): Focused on developing equipment, improving climate models, designing prototype aircraft capable of carrying about 100 tonnes of material into the stratosphere every several hours, and executing small-scale monitoring experiments.
Phase Two (Experimental Operations): Involves scaled-up experimental operations where policymakers and major global powers naturally become actively engaged as the scale approaches one-thousandth of full deployment.
Phase Three (Construction): Full-scale operational deployment if deemed necessary and safe by international consensus.

This structured roadmap is designed to navigate four major categories of risk associated with sunlight reflection:

Harm Risk: The possibility that experiments or operations uncover unforeseen environmental damage, necessitating program termination.
Conflict Risk: The danger that nations or political groups might dispute or fight over the intervention.
Timing Risk: The threat that research, testing, and construction efforts lag behind escalating severe climate impacts.
Termination Risk: The hazard that if sunlight reflection masks warming for centuries while greenhouse gas concentrations continue to rise unchecked, stopping the reflection abruptly would unleash an extreme, rapid warming surge.

To mitigate termination risk, SAI must be coupled with parallel moonshots in carbon dioxide removal and cheap clean energy to safely lower atmospheric greenhouse gas concentrations over time.

Financing and Catalysing the Climate Moonshot

A core thesis of the Manhattan2 project is that a massive global consensus is not required to jumpstart critical R&D. While a full-scale deployment would ultimately require broad transboundary agreements, early-stage research can be catalyzed efficiently by a small group of determined funders, foundations, or high-net-worth individuals.

Weinreb estimates that an initial investment of roughly $100 million—or even smaller increments like $2 million to $5 million—could dramatically advance the agenda. Practical initial steps include:

Funding subject-matter experts to refine AI-generated R&D proposals into open-source documents published on platforms like APlanToSaveThePlanet.org.
Producing educational media, such as a docudrama film exploring climate R&D solutions.
Hosting a climate moonshot conference where leading experts outline what they could achieve with billions in targeted funding.

Conclusion

The conversation between Robbie Tulip and Glenn Weinreb underscores a pragmatic shift in how humanity might confront environmental collapse. By recognizing that decarbonisation alone cannot neutralize legacy emissions quickly enough to prevent catastrophic tipping points—such as the disruption of Atlantic Ocean circulation or the melting of ice sheets—the climate moonshot framework offers a vital alternative. Through open-source R&D, improved climate modeling, and rigorous management of geoengineering risks, humanity can build the technical foundation needed to safely cool the planet and secure a stable future for generations to come.