History is unfolding in Missoula, Montana, where a landmark climate case, Lighthiser v. Trump, is set to begin on Tuesday, September 16, 2025. Over the course of two days, 22 courageous young plaintiffs will step into federal court to argue that their constitutional rights are being violated by government actions that worsen the climate crisis. Backed by an accomplished legal team and internationally recognized expert witnesses, these youth are standing at the forefront of the fight for a livable future.
A Historic Moment for Climate Justice
The plaintiffs in Lighthiser v. Trump represent a generation whose future is directly threatened by the escalating climate emergency. Their case argues that the government’s policies and actions—particularly those that prioritize fossil fuel expansion over climate solutions—violate their fundamental rights to life, liberty, and property. In addition, they contend that the government’s actions undermine their right to a stable climate system, which is essential for survival and wellbeing.
This trial is not just about one lawsuit; it is about the broader struggle of young people to hold leaders accountable for decisions that will shape the planet for decades to come. It follows in the footsteps of other youth-led climate cases that have gained global attention, but it stands out for its timing and scale. With climate disasters intensifying year after year, the stakes could not be higher.
Community Support on the Ground
Supporters from across the region are converging in Missoula to stand with the youth plaintiffs. Each morning of the hearing—Tuesday and Wednesday, September 16 and 17—a peaceful rally will take place outside the federal courthouse from 7:15 to 8:15 a.m.
Advocates are urging community members to bring signs, raise their voices, and show solidarity with the young people inside the courtroom. These rallies are designed to highlight the public demand for action on climate change and to remind decision-makers that this case resonates far beyond the courtroom walls.
The Role of Expert Witnesses
To strengthen their case, the youth plaintiffs are supported by a powerhouse lineup of expert witnesses. These include leading climate scientists, public health professionals, and constitutional scholars who will present evidence on the harms of government inaction. From data on rising global temperatures and extreme weather events to testimony about the psychological toll of climate anxiety on young people, the trial promises to present a comprehensive picture of how today’s policies are shaping tomorrow’s realities.
Why This Case Matters
At its core, Lighthiser v. Trump is about the rights of future generations. The plaintiffs argue that their government is knowingly making choices that worsen climate change, putting young people and their children at risk. If successful, this case could set a precedent for how the U.S. legal system addresses the intersection of constitutional rights and environmental protection.
Beyond the legal arguments, the case carries deep symbolic weight. It underscores the growing movement of youth taking the lead in the fight against climate change—a movement that demands accountability and refuses to accept inaction.
Standing With the Next Generation
The courage of these 22 young plaintiffs speaks to a broader truth: the climate crisis is no longer a distant problem, but an urgent reality shaping lives today. Their stand in Missoula is part of a global wave of youth activism that insists governments and industries cannot continue with “business as usual” while the planet warms and ecosystems collapse.
For those who cannot attend the hearings in person, there are still ways to support the youth plaintiffs and amplify their message. Sharing updates, engaging on social media, and educating communities about the significance of the case all help keep the spotlight on this historic fight.
As these young leaders step into court, they carry with them the hopes and demands of a generation that refuses to be silent. Their case is not only about protecting constitutional rights—it is about ensuring a future where clean air, stable climates, and thriving ecosystems are guaranteed for all.
To learn more about youth-led activism and how to support the next generation of climate leaders, visit Sustainable Action Now’s youth initiatives.
