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Brightening clouds is one of several ideas to push solar energy back into space -- sometimes called solar radiation modification, solar geoengineering, or climate intervention.
ALAMEDA, Calif. — A little before 9 a.m. on Tuesday, an engineer named Matthew Gallelli crouched on the deck of a decommissioned aircraft carrier in San Francisco Bay, pulled on a pair of ear protectors, and flipped a switch.
Some observers argue the end of SCoPEx should mark the end of such proposals. Others say any future experiments should proceed in markedly different ways.
Google is weighing up charging for its AI-powered search
As humans continue to burn fossil fuels and pump increasing amounts of carbon dioxide into the atmosphere, the goal of holding global warming to a relatively safe level is slipping away.