A covert experiment testing solar geoengineering technologies in California was unexpectedly stopped earlier this year after city authorities discovered the project had proceeded without public notice — despite intentions to expand the trial across an area surpassing Puerto Rico in size.
Documents obtained by Politico and Futurism reveal that researchers from the University of Washington, collaborating with nonprofit SRI International and advocacy organization SilverLining, conducted a short cloud brightening trial onboard an out-of-service aircraft carrier docked in Alameda, California.
This initiative, which involved dispersing saltwater aerosols into the atmosphere, sought to increase reflectivity and mitigate global temperature rise — a technique known as marine cloud brightening, falling under the broader category of solar radiation management.
Authorities halted the experiment after roughly 20 minutes upon learning the operation had not been publicly disclosed. Subsequent internal communications exposed that project leaders had deliberately postponed public notification to “avoid alarming citizens,” intensifying debates about transparency and ethical scientific conduct.
Billionaire Support, Military Resources, and Ambitious Global Plans
The coastal test was part of a grander vision. More than 400 internal emails and strategic documents indicated preparations for a massive 3,900-square-mile maritime trial — comparable in size to Puerto Rico — in waters near North America, Chile, or south-central Africa.
Funding came from notable philanthropists including crypto entrepreneur Chris Larsen, Rachel Pritzker, and foundations linked to Intel co-founder Gordon Moore. A proposal to the Quadrature Climate Foundation projected costs between $10 million and $20 million, with intentions to eventually deploy experiments at multiple sites worldwide.
Although the project received limited federal support from the Department of Energy and NOAA, plans existed to utilize U.S. government aircraft and vessels for expansion. Political opposition and Trump’s re-election have since diminished federal backing for such contentious climate interventions.
By mid-2024, the Alameda city council officially revoked the project’s permission, citing lease violations of the aircraft carrier museum and failure to engage the local community effectively. Michael Brune, former Sierra Club executive director and advisor tied indirectly to the project, remarked, “Community involvement here was insufficient, and the controversy was foreseeable.”
Scientific Debate and Public Concern Over Solar Dimming Strategies
The prospect of deliberately modifying Earth's climate is a polarizing subject. Proponents argue solar geoengineering research is crucial as a potential last-resort measure against severe warming, while critics highlight possible adverse impacts on weather systems, farming, and natural habitats.
A 2023 open letter endorsed by over 575 scientists called for an international moratorium on solar geoengineering development, citing inadequate global regulatory frameworks. Opponents also warn about termination shock — a rapid temperature increase if solar dimming is abruptly discontinued before climate change is resolved.
“Our research does not endorse using marine cloud brightening to modify climate or weather,” explained Sarah Doherty, lead scientist at the University of Washington. She emphasized that the Alameda experiment was merely designed to test aerosol sprayer functionality under practical conditions.
However, some advocates concede misjudgments were made. “There’s a clear distinction between regulatory obligations and what would have been prudent,” noted Daniele Visioni, an atmospheric scientist at Cornell University involved in creating ethical frameworks for geoengineering studies.
Secrecy, Misinformation, and Changing Political Dynamics
The Alameda incident unfolded amid a surge in geoengineering conspiracy theories. Rep. Marjorie Taylor Greene (R-GA) attributed recent Texas floods to weather tampering efforts, pushing legislation to ban geoengineering outright. Meanwhile, Florida Governor Ron DeSantis enacted a statewide prohibition on releasing atmospheric agents aimed at influencing climate or weather.
Federal agencies have responded with facts. In July, EPA Administrator Lee Zeldin published a detailed rebuttal of “chemtrail” conspiracy claims, backed by longstanding scientific data. Despite this, public skepticism remains high, especially when researchers operate without transparency.
A prior solar dimming trial in Sweden’s Arctic region was canceled in 2021 following protests by Indigenous communities and environmental activists. This initiative, called SCoPEx, was officially terminated last year.
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