Senate Bill No. [number] aims to revise laws related to weather modification by specifically prohibiting geoengineering practices in Montana. The bill defines geoengineering as large-scale interventions in the Earth's climate system intended to counteract or mitigate global climate change, which includes methods such as stratospheric aerosol injection, solar radiation management, and marine cloud brightening. The legislation acknowledges the potential risks to the environment and public health associated with geoengineering due to its experimental nature and the possibility of unintended consequences.

The bill allows for an exception for weather modification through cloud seeding, which is recognized as a proven method for increasing precipitation to support water resource management efforts, particularly in agriculture and snowmaking. The new legal language replaces previous references to weather modification and control, emphasizing the distinction between cloud seeding and geoengineering. The act is set to take effect immediately upon passage and approval.