Cloud Brightening Study in California Is Halted by Local Officials

Officials in Alameda, Calif., have told scientists to stop testing a device that might one day be used to artificially cool the planet by making clouds brighter, reflecting planet-warming sunlight back into space.The experiment, conducted by researchers from the University of Washington, involved spraying tiny sea-salt particles across the flight deck of a decommissioned aircraft carrier, the U.S.S. Hornet,…