The USS Hornet may be a decommissioned aircraft carrier, yet it has nevertheless become the launch-site for a controversial new war in the skies.

The Marine Cloud Brightening Program‘s Coastal Atmospheric Aerosol Research and Engagement project, led by researchers from the University of Washington, took to the deck of the Hornet Tuesday to launch streams of particles into the sky above the San Francisco Bay. Their ultimate objective is apparently to block and reflect sunlight in hopes of limiting “global warming.”

CAARE researchers behind the geoengineering scheme opted not to announce their experiment, reportedly citing concerns that there might be significant backlash.

After all, the American public — or at the very least, the residents of Alameda — might first want to hear from the hundreds of scientists who have called for a non-use agreement for solar radiation management and stated in an open letter that the “risks of solar geoengineering are poorly understood and can never be fully known. Impacts will vary across regions, and there are uncertainties about the effects on weather patterns, agriculture, and the provision of basic needs of food and water.”

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