India, Dec. 17 -- Youth activists in the United States' Montana who won a landmark constitutional climate case against their government in 2023 are back in court, seeking to block new laws they say undermine their right to a clean and healthful environment.

Lawyers representing 13 of the 16 original plaintiffs in Held v State of Montana filed a petition for original jurisdiction with the Montana Supreme Court on December 10, 2025. The case asks the court to enforce its earlier judgment and strike down three environmental laws passed earlier this year.

The petition names the state of Montana, Governor Greg Gianforte and the Montana Department of Environmental Quality (DEQ) as respondents. It challenges House Bills 285 and 291, and Senate...