Require legislative approval of greenhouse gas rules

This bill requires that any state agency rules or regulations concerning greenhouse gas emissions or the social cost of carbon must be approved by the Montana Legislature before they can take effect. It directly affects state departments, commissions, and boards that have the authority to create rules on these environmental topics. The key mechanism is a delay provision that prevents such rules from becoming effective until the legislature reviews and approves them during the next legislative session. Additionally, the bill includes instructions on how these new requirements should be added to the state's existing legal code.