As scientists consider climate engineering to address climate change, legal questions emerge. “[I]f a country felt it was being targeted by hostile geoengineering, this could bring the 1978 Environmental Modification Convention, now largely dormant, off the bench and into play. “It does have the provision that if some nation says they think another country is ruining their weather, it can trigger a [UN] Security Council meeting,” says science historian James Fleming of Colby College in Waterville, Maine.