I figured the legislature prohibited considering greenhouse gas emissions in a roundabout way, but nope... From the law itself (emphasis mine):
> (2) (a) Except as provided in subsection (2)(b), an environmental review conducted pursuant to subsection (1) may not include an evaluation of greenhouse gas emissions and corresponding impacts to the climate in the state or beyond the state's borders.
Context: Subsection (1) just defines the general what and why of an environmental impact statement. Subsection (2)(b) gives only two exceptions: If the project is being done jointly with a federal agency and the federal agency requires it, or if congress amends the Clean Air Act to define carbon dioxide as a regulated pollutant.
> (2) (a) Except as provided in subsection (2)(b), an environmental review conducted pursuant to subsection (1) may not include an evaluation of greenhouse gas emissions and corresponding impacts to the climate in the state or beyond the state's borders.
Context: Subsection (1) just defines the general what and why of an environmental impact statement. Subsection (2)(b) gives only two exceptions: If the project is being done jointly with a federal agency and the federal agency requires it, or if congress amends the Clean Air Act to define carbon dioxide as a regulated pollutant.
Source: https://leg.mt.gov/bills/2023/billpdf/HB0971.pdf