House Bill No. introduced by C. Schomer mandates that any rules or regulations established by state departments, local authorities, or commissions regarding greenhouse gas emissions or the social cost of carbon must receive legislative approval before they can take effect. This requirement applies specifically to rules related to the operation of motor vehicles and is intended to ensure that such regulations are subject to oversight by the legislature during the next legislative session.

The bill includes several new sections that outline this requirement for different governing bodies, including departments, local authorities, commissions, and boards. Each section specifies that the relevant rules will not be effective unless they are approved by the legislature, thereby reinforcing the legislative role in environmental regulation concerning greenhouse gas emissions and carbon costs. Additionally, the bill includes codification instructions to integrate these new provisions into existing legal frameworks across various titles and chapters of Montana law.