Geoengineering; prohibit certain weather and temperature modification.

HB 1406 prohibits intentionally injecting, releasing, or dispersing chemicals into Mississippi's atmosphere with the purpose of altering temperature, weather, or sunlight intensity. The bill directly affects any individual, corporation, or aircraft operator conducting such "geoengineering" activities within the state. Key mechanisms include imposing felony penalties (up to $100,000 fines or 5 years in prison for violators, with reduced penalties for aircraft operators) and requiring public infrastructure operators to report aircraft equipped for weather modification starting in 2026. The law also mandates reporting violations to the Mississippi Department of Transportation and integrates with existing air pollution definitions in state code.