Held v. Montana is the youth-led climate lawsuit in which sixteen young Montanans convinced state courts that a Montana law forbidding agencies from weighing greenhouse gas emissions in environmental reviews violated their constitutional right to a clean and healthful environment. A district court struck the law down in August 2023, and the Montana Supreme Court affirmed the ruling 6–1 in December 2024, making it the first constitutional climate trial won by young plaintiffs in the United States.
What the Lawsuit Challenged
The target was a provision of the Montana Environmental Policy Act known as the MEPA Limitation. It barred state agencies from evaluating greenhouse gas emissions or climate impacts when reviewing proposed energy and development projects. When a company applied for a permit to build a coal mine or a power plant, the state was legally prohibited from considering how much carbon the project would emit or what that would mean for the climate.
After the suit was filed in 2020, the Montana Legislature reinforced the ban in 2023, passing a law that explicitly forbade “an evaluation of greenhouse gas emissions and corresponding impacts to the climate” from MEPA reviews. The plaintiffs argued the prohibition let the state approve fossil fuel projects without any accounting for climate harm.1Harvard Law Review. Held v. State
The Constitutional Right at Issue
Montana’s 1972 Constitution contains unusually strong environmental language. Article II, Section 3 lists the right to “a clean and healthful environment” among the inalienable rights of all persons.2Montana Legislature. Constitution of the State of Montana Article IX, Section 1 directs the state and its citizens to “maintain and improve a clean and healthful environment in Montana for present and future generations” and requires the legislature to protect the state’s “environmental life support system from degradation.”3Montana Legislature. Montana Constitution, Article IX, Section 1
Montana courts had long treated that right as fundamental, meaning any law infringing it must survive strict scrutiny — the most demanding standard of judicial review. That doctrinal footing is what made the case possible. The plaintiffs were represented pro bono by Our Children’s Trust, with Montana co-counsel from the Western Environmental Law Center and McGarvey Law.4Sabin Center for Climate Change Law. Held v. State Case Documents
The 2023 Trial Ruling
The case went to trial before Judge Kathy Seeley in the First Judicial District Court from June 12 to 20, 2023.5Our Children’s Trust. Held v. Montana Supreme Court On August 14, 2023, she ruled entirely for the plaintiffs.
Seeley found an “overwhelming scientific consensus” that human-caused greenhouse gas emissions drive global warming, and that Montana’s globally significant emissions contribute to climate change that has already caused the plaintiffs “acute and chronic” physical and psychological harms, including asthma, economic losses, anxiety, and degradation of forests, rivers, and glaciers they depend on.1Harvard Law Review. Held v. State
Applying strict scrutiny, she concluded the MEPA Limitation failed the test: it did not serve a compelling state interest and was not narrowly tailored. The court declared the MEPA Limitation and a companion provision barring injunctive relief in MEPA challenges unconstitutional, and ordered them permanently struck down.6CLX Toolkit. Held v. Montana Casebook
The Montana Supreme Court Decision
Attorney General Austin Knudsen appealed on October 2, 2023, calling the ruling “absurd.”7The Hill. Montana Appeals Landmark Climate Change Ruling The state argued the plaintiffs lacked standing because their injuries were generalized, that the trial court had intruded on the legislature’s authority, and that the framers of the 1972 Constitution never discussed climate change, so the environmental right could not cover it.8Sabin Center for Climate Change Law. Held v. State Case Collection
On December 18, 2024, the Montana Supreme Court issued a 70-page opinion affirming the district court by a vote of 6–1.9Daily Montanan. Montana Supreme Court Affirms Decision in Held, Historic Youth Climate Case Chief Justice Mike McGrath wrote for the majority. The court held that Montana’s constitutional right to a clean and healthful environment includes the right to a “stable climate system that sustains human lives and liberties.”
The justices rejected the state’s originalist argument, reasoning that the Montana Constitution is a “living thing” and not a “straight-jacket,” and that the framers designed the environmental provision to be “both anticipatory and preventative.” The right did not require the framers to have envisioned climate change specifically — only that the issue fall within the “object and true principles” of what they intended to protect.10Justia. Held v. State, 2024 MT 312
On standing, the court found the plaintiffs’ aesthetic, recreational, and economic injuries sufficiently personal, and that a plaintiff alleging a constitutional violation need not show their injury is distinguishable from the general public’s. The court also dismissed the state’s redressability objection, concluding that reducing Montana’s emissions “would slow the pace of global emissions increases,” even if Montana is only one contributor.9Daily Montanan. Montana Supreme Court Affirms Decision in Held, Historic Youth Climate Case In one of the opinion’s most quoted lines, the court wrote that it would not grant the state “a free pass to pollute the Montana environment just because the rest of the world insisted on doing so.”10Justia. Held v. State, 2024 MT 312
The permanent injunction against the MEPA Limitation was upheld.
What Happened After: The 2025 Laws and Held II
Rather than integrate climate analysis into environmental reviews, the 2025 Montana Legislature passed a package of bills that critics said gutted MEPA. Governor Greg Gianforte signed them on May 1, 2025.11Montana Free Press. Gianforte Signs MEPA Bills Into Law The key measures were:
- House Bill 285, which declared MEPA “purely procedural in nature,” repealed provisions directing agencies to consider long-range environmental impacts, and prohibited agencies from denying or conditioning permits based on environmental review findings.12LegiScan. Montana HB 285
- Senate Bill 221, which required inventorying six greenhouse gases during environmental reviews for energy projects but explicitly directed agencies not to regulate them.13Daily Montanan. Montana Legislature Advances Differing Visions for MEPA’s Future
- House Bill 291, which prohibited Montana agencies from adopting air quality standards stricter than federal standards.11Montana Free Press. Gianforte Signs MEPA Bills Into Law
Legislative supporters said the bills gave Montana businesses certainty and prevented MEPA from being used to block development. Anne Hedges of the Montana Environmental Information Center said the laws left the state without a mechanism to honor the constitutional right the courts had just affirmed.11Montana Free Press. Gianforte Signs MEPA Bills Into Law
Thirteen of the original sixteen plaintiffs, joined by three new youth co-plaintiffs, filed what has become known as Held v. Montana II. They petitioned the Montana Supreme Court for original jurisdiction on December 10, 2025. On December 23, 2025, the court unanimously declined, finding the plaintiffs had not shown the matter was too urgent for the district court process and noting they had waited seven months after the laws took effect to file.14Daily Montanan. Supreme Court Declines to Take Held Youth Challenges to 2025 Laws Lead attorney Nate Bellinger said the court “did not question the merits of our claims or the landmark Held decision.”15Climate in the Courts. Montana Supreme Court Denies New Petition From Youth Climate Activists
The plaintiffs refiled in the First Judicial District Court on January 16, 2026, with the case initially assigned to Judge Seeley.16Daily Montanan. Youth Climate Plaintiffs File Suit in State District Court The state moved to dismiss and sought to transfer the case to Sidney under a venue-transfer law passed the same session. District Court Judge Mike Menahan denied the transfer, ruling that suits challenging the state belong in the county where they were filed.17News From the States. Court Won’t Move Climate Lawsuit to Eastern Montana On March 18, 2026, the plaintiffs also launched a separate constitutional challenge to the venue law itself.14Daily Montanan. Supreme Court Declines to Take Held Youth Challenges to 2025 Laws As of mid-2026, the merits of the challenge to the 2025 laws have not been reached.
Why the Case Matters Beyond Montana
Held is the first youth-led constitutional climate case in the United States to win at trial and on appeal. Its reasoning turns on a state constitutional right, not federal law, which is why parallel federal litigation has fared differently: Juliana v. United States, brought by the same organization, ended when the U.S. Supreme Court denied certiorari on March 24, 2025.18Our Children’s Trust. Juliana v. United States
Held’s reach is therefore limited by design. The ruling binds Montana and interprets Montana’s Constitution. It does not force other states to consider greenhouse gases in permitting, and it does not create a federal climate right. What it does provide is a template. Montana, Hawaii, Pennsylvania, New York, Illinois, and Massachusetts all have constitutional provisions recognizing environmental rights, and advocacy groups are pushing for similar amendments elsewhere.19Harvard Environmental Law Review. What We Learned in Held v. Montana In Hawaii, a similar youth case, Navahine F. v. Hawaii Department of Transportation, settled in June 2024 with the state agreeing to implement carbon reduction plans for its transportation system.20Brennan Center – State Court Report. Montana’s Climate Change Lawsuit May See Sequels Across America
Whether Held’s practical effect in Montana survives the 2025 laws is the question now before the district court.