MT HB630

Agency rules regulating greenhouse gas emissions or calculating/applying the social cost of carbon cannot take effect unless approved by the legislature at the next legislative session

Applies to rules from multiple state entities: the Department of Justice (motor vehicle operations), the Public Service Commission, the Department of Environmental Quality, and the Board of Oil and Gas Conservation

Covers both state department rules and local authority regulations related to greenhouse gas emissions for motor vehicles

Codifies these restrictions across four separate titles of Montana law: Title 61 (motor vehicles), Title 69 (public utilities), Title 75 (environmental protection), and Title 82 (minerals, oil, and gas)