How 'Green Amendments' Are Rewriting Environmental Law in State Constitutions

The US Constitution guarantees the right to free speech, the right to bear arms, and the right to a speedy trial. But nowhere in its text does it guarantee the right to breathe clean air or drink pure water. For decades, environmental advocates have tried to persuade federal judges to recognize an implied right to a stable climate—most notably in the long-running Juliana v. United States case—but those efforts have consistently hit a judicial wall. Federal courts have repeatedly ruled that creating such a right is the job of the legislature, not the judiciary.[1][7]

Blocked at the federal level, a growing legal movement has pivoted to a different strategy: state constitutions. Across the country, advocates are pushing for "Green Amendments"—self-executing provisions added directly to a state's Bill of Rights. These amendments elevate environmental protections from mere policy goals to fundamental, inalienable rights, placing them on the exact same legal footing as freedom of religion or due process.[3][7]

"A green amendment does not directly change environmental regulations or enforcement in a state," notes the Rockefeller Institute of Government. Instead, it provides a powerful constitutional backstop. If a state legislature passes a law that severely degrades the environment, or if a state agency permits a highly polluting project, citizens can sue the government for violating their fundamental rights.[2]

The concept is not entirely new. During the height of the original environmental movement in the early 1970s, two states pioneered the approach. Pennsylvania passed the nation's first environmental rights amendment in 1971, followed closely by Montana in 1972. Both states explicitly guaranteed their citizens the right to a "clean and healthful environment."[1][2]

However, for nearly four decades, these provisions lay dormant. State courts largely interpreted them as procedural guidelines rather than substantive, enforceable rights. That changed dramatically in 2013, when a landmark Pennsylvania Supreme Court ruling used the state's Green Amendment to strike down a pro-fracking law that had stripped local municipalities of their zoning powers. The ruling proved that state constitutions could be weaponized to protect local environments when statutory laws failed.[1][3]

That victory sparked a modern revival, leading to the most significant climate litigation victories in US history. In 2023, the trial of Held v. Montana captivated the legal world. Sixteen youth plaintiffs sued the state over a law that explicitly prohibited agencies from considering greenhouse gas emissions when approving fossil fuel projects.[1][6]

The plaintiffs argued that the law violated their constitutional right to a clean and healthful environment. In a historic ruling, the trial court agreed, finding that the youth were already suffering recognizable physical and mental injuries from climate change. In late 2024, the Montana Supreme Court upheld the victory, confirming for the first time that the state's constitutional guarantee includes a "stable climate system."[1][6]

The momentum quickly spread beyond the Rocky Mountains. In June 2024, youth plaintiffs in Hawaii achieved another global first in Navahine v. Hawaii Department of Transportation. Relying on Hawaii's robust constitutional environmental protections, the plaintiffs sued the state for operating a transportation system that heavily favored highway expansion and fossil fuels over clean alternatives.[4][5]

Rather than fighting the youth in court, the Hawaii state government chose to settle. The historic agreement legally bound the Department of Transportation to a comprehensive decarbonization roadmap. The state committed to achieving net-negative emissions in its transportation sector by 2045, establishing interim greenhouse gas reduction targets, and creating a dedicated climate change mitigation unit.[4][5]

"The settlement agreement... acknowledges the constitutional rights of Hawaiʻi's youth to a life-sustaining climate," the state government announced following the resolution. Legal scholars view the Navahine settlement as a holistic blueprint for how state governments can work collaboratively with citizens to fulfill their constitutional environmental duties, rather than engaging in endless adversarial litigation.[4][7]

Recognizing the power of these provisions, voters in other states are now demanding their own. In 2021, New York voters overwhelmingly approved a ballot measure adding a Green Amendment to their state constitution, which officially took effect in 2022. The amendment simply reads: "Each person shall have a right to clean air and water, and a healthful environment."[2][3]

Today, a coordinated grassroots campaign—spearheaded by organizations like Green Amendments for the Generations—is pushing to expand the map. As of 2026, more than a dozen states, including Washington, New Mexico, New Jersey, and Florida, are actively drafting or considering similar constitutional amendments. Some states are even adding explicit language to ensure these rights are enforced equitably across low-income and minority communities.[3][7]

But the movement faces fierce opposition. Industry groups, chambers of commerce, and some state lawmakers argue that Green Amendments are dangerously vague. They contend that terms like "healthful environment" are subjective and lack the precise scientific metrics found in traditional environmental statutes like the Clean Air Act.[2][7]

Critics warn that elevating these broad concepts to the constitutional level bypasses the democratic legislative process, transferring immense policy-making power to unelected judges. Furthermore, opponents argue that these amendments invite a flood of costly, frivolous litigation that creates regulatory uncertainty and drives up the cost of doing business, particularly for the energy, agriculture, and manufacturing sectors.[2][7]

In Montana, the legal battles are far from over. In late 2025, the youth plaintiffs from the Held case filed a new petition challenging a slate of 2025 laws that they argue were designed to circumvent their earlier Supreme Court victory. While the high court directed them to start in the lower trial courts, the ongoing friction highlights the tension between constitutional rights and legislative agendas.[6]

Despite the pushback, the legal landscape has fundamentally shifted. By bypassing the gridlocked federal system and embedding environmental protections directly into state founding documents, advocates have found a durable mechanism for accountability. State constitutions have quietly become the most dynamic and consequential frontier for environmental rights in the United States.[7]