De facto moratorium on solar geoengineering remains in place

After heated talks at the United Nations Environment Assembly, a de facto moratorium on solar geoengineering remains in place. The tactic, which involves launching particles into the sky to reflect sunlight and cool the planet, is controversial. The hottest year on record was in 2023, and despite this, planet-heating emissions reached a record high. A startup's experiments in Mexico and the US have sparked concerns, leading to calls for international rules to govern geoengineering efforts.