San Francisco nonprofit Reflective has released a comprehensive blueprint for studying stratospheric aerosol injection (SAI), aiming to close critical knowledge gaps before governments face pressure to deploy the technology. The report, titled the SAI Research Roadmap, outlines a coordinated decade-long effort costing approximately $370 million. This systematic approach stands in stark contrast to the current fragmented landscape, which the organization estimates would take 20 years and cost nearly $1.4 billion to achieve similar clarity. Dakota Gruener, Reflective’s cofounder and CEO, argues that the world may need to make consequential decisions on timelines far shorter than our current research system can support.
The roadmap prioritizes outdoor experiments involving the release of sulfur dioxide into the stratosphere to observe real-world atmospheric reactions. This recommendation reignites a fierce debate within the scientific community. Since 2002, hundreds of academics have signed open letters calling for a ban on such field tests, fearing that normalizing these experiments creates a slippery slope toward deployment. Aarti Gupta, a professor at Wageningen University and co-initiator of the non-use initiative, challenges the technical focus of reports like this. She argues that the primary issues are not scientific but political: “Who would control a planet-altering technology? Who would develop it, and who would deploy it, and to what end?”
Reflective has rapidly become a central player in this niche, raising over $20 million from prominent charities and individuals since its incorporation in late 2023. The organization has already distributed around $4 million to various research groups and developed tools like an open-source simulator. The new roadmap builds on their earlier Uncertainties database, moving from identifying unknowns to proposing specific methods to resolve them. Initial phases focus on foundational computer simulations and lab work to understand impacts on regional ecosystems, ice sheets, and crop yields.
This push for structured research highlights a growing tension between the urgency of climate adaptation and the risks of governing global technologies. While Reflective insists it does not advocate for using SAI, its framework effectively prepares the technical ground for potential future use. The question remains whether improved data will lead to better governance or simply accelerate the momentum toward deployment. With major philanthropies backing this agenda, the window for establishing international non-use agreements may be closing faster than critics anticipated.
