Environmental protection; prohibit geoengineering.

SB 2418 prohibits geoengineering activities in Mississippi, defined as the intentional release of chemicals into the atmosphere to alter weather or temperature. It directly affects any entity conducting such activities within the state, excluding standard agricultural pesticides, herbicides, and fungicides. The bill amends environmental laws to define geoengineering, grant the Mississippi Commission on Environmental Quality authority to regulate it, and establish penalties for violations. Research institutions are exempt from the prohibition, and the law explicitly excludes routine farming chemical use. The measure aims to protect public health and environmental welfare by restricting atmospheric interventions not yet fully understood.