Sarah Doherty, the manager of the University of Washington's marine cloud brightening program, on the flight deck of the Hornet, a decommissioned aircraft carrier that is now a museum in Alameda, Calif., on April 2, 2024. Brightening clouds is one of several ideas to push solar energy back into space -- sometimes called solar radiation modification, solar geoengineering, or climate intervention. (Ian C. Bates/The New York Times)