Yashas Raj and Jake Chapman are hunkered down in a basement laboratory at the University of Cambridge’s Department of Engineering—tinkering with a handheld nozzle they hope will one day be capable of shooting trillions of microscopic water droplets into the sky every second to brighten clouds over the Arctic Ocean. Boosting cloud reflectivity by adding … Continue reading A New Generation of Climate Scientists Warm Up to Solar Geoengineering