Scientists weigh sun-dimming geoengineering to blunt a coming Super El Niño
A Science Advances study explores marine cloud brightening—spraying particles into ocean clouds to reflect sunlight—as a controversial, temporary tool to lessen the impacts of a potential Super El Niño. Using a natural-fire–driven analog, researchers modeled deploying the technique before two historic El Niño events and found it could reduce heat and dryness and boost La Niña conditions by about 40%, especially if used early. The paper stops short of advocacy, calling it a proof-of-concept that warrants further study while flagging major caveats: technical feasibility, uncertain regional effects, ethical questions about governance, and the risk of unintended consequences or termination shocks if deployed. Experts caution that while intriguing, such geoengineering is far from ready and should not replace emissions cuts.
