Beyond Lawsuits: 5 Tactics Climate Groups Could Borrow From Clean Air Fights
When environmental groups filed their lawsuit challenging the Trump administration’s rescission of the EPA’s greenhouse gas endangerment finding in February 2026, they followed a well-worn playbook: gather a coalition, draft compelling legal arguments, and head to federal court.
But the legal landscape has shifted dramatically since Massachusetts v. EPA established the foundation for climate regulation in 2007. The Supreme Court has gutted Chevron deference, embraced the major questions doctrine, and grown increasingly skeptical of agency authority.
Environmental movements have a rich history of creative tactics beyond traditional lawsuits—strategies that amplified legal campaigns, created multiple pressure points, and accelerated victories. The Clean Air Act battles of the past fifty years offer a tactical playbook that climate groups haven’t fully deployed yet.
What Happened in February 2026
The EPA’s rescission announcement on February 12 eliminated the legal foundation for federal greenhouse gas regulation—the 2009 finding that carbon dioxide, methane, and other greenhouse gases endanger public health and welfare. Within a week, a coalition spanning health organizations, environmental groups, and state governments filed their challenge in the D.C. Circuit.
The plaintiff list reads like a who’s who of environmental advocacy: the American Public Health Association, Clean Air Council, Environmental Defense Fund, Public Citizen, Union of Concerned Scientists, Natural Resources Defense Council, American Lung Association, and Center for Biological Diversity. State attorneys general from California, Illinois, and other jurisdictions coordinated parallel actions.
Their legal argument centers on Massachusetts v. EPA, the 2007 Supreme Court decision that ruled greenhouse gases qualify as air pollutants under the Clean Air Act. As Peter Zalzal from the Environmental Defense Fund put it, the Trump EPA is “trampling mountains of scientific evidence” and rehashing arguments the Supreme Court already rejected.
The EPA’s defense shifted ground from its initial proposal. After federal courts found that the administration violated the Federal Advisory Committee Act in assembling a panel of climate contrarian scientists, the final rescission pivoted to a different argument: that the Clean Air Act simply doesn’t authorize EPA to regulate greenhouse gases because such regulation addresses global climate change rather than local air pollution, and because decisions of this economic magnitude require explicit congressional authorization.
Why This Lawsuit Might Not Be Enough
The litigation serves important functions—it generates media coverage, preserves legal arguments, and prevents procedural defaults. The coalition’s diversity creates multiple substantive legal theories, increasing the odds that at least some arguments succeed.
But the structural obstacles are daunting. The Supreme Court that decided Massachusetts v. EPA in 2007 no longer exists. The current Court has systematically constrained agency authority through decisions like West Virginia v. EPA in 2022, which invoked the major questions doctrine to strike down the Clean Power Plan. The Court eliminated Chevron deference entirely in 2024 through Loper Light Enterprises v. Raimondo.
These doctrinal shifts mean arguments that failed in 2007 might succeed in 2026. The Trump EPA explicitly invokes these recent precedents, arguing that regulating greenhouse gases represents such a vast economic policy decision that Congress must explicitly authorize it. If courts accept this framing, the plaintiffs lose—regardless of how strong their scientific evidence is.
There’s also the timeline problem. Multi-year federal appellate litigation requires sustained funding, expert witnesses, and organizational attention. The case likely won’t reach the Supreme Court until 2028 or later. During that time, the rescission remains in effect, allowing vehicle manufacturers and industrial facilities to abandon emissions reduction investments.
Five Tactics from Clean Air Fights That Could Amplify Impact
1. Coordinated State Litigation Creates Multiple Pressure Points
The tobacco litigation of the 1990s showed that state-level legal action, synchronized with federal cases, can accelerate outcomes dramatically. State attorneys general coordinated both legal arguments and settlement negotiations, achieving results far faster than individual suits would have.
Climate groups could recommend that states like California, New York, and Illinois file separate challenges in state courts, asserting that the federal rescission violates state constitutional environmental protections and public health statutes. This creates parallel legal universes where the same core question—whether greenhouse gases endanger health—gets litigated simultaneously in federal appellate court and multiple state supreme courts.
Favorable state court rulings would pressure federal litigation, establish alternative legal grounds for regulation, and provide safe harbor for state-level protective action even if the federal case fails. The state-level implications are already significant—California has threatened to pursue independent regulatory authority if federal protections disappear.
2. Recruit Financial Sector Organizations as Unexpected Allies
Environmental litigation has traditionally centered on environmental and health organizations. But the divestment movement demonstrated that financial institutions increasingly view climate change and regulatory instability as material financial risks.
Insurance companies facing mounting climate-related claims have a financial interest in EPA regulation creating clarity and reducing long-tail liability. Major pension funds and institutional investors managing trillions of dollars increasingly support climate regulation because regulatory certainty enables long-term financial planning.
Climate groups could recruit these organizations to file amicus briefs emphasizing how the rescission creates regulatory uncertainty that increases liability exposure and impairs investment decision-making. This introduces economics-based arguments alongside health and environmental arguments, broadening the constituency beyond traditional environmental supporters.
The tobacco litigation showed that business organizations with financial interests in regulatory clarity can become unexpected allies, even where they might otherwise oppose regulation.
3. Build Labor and Community Coalitions Around Regional Impacts
The endangerment finding rescission will have disparate regional impacts. Certain communities bear disproportionate health burdens from increased vehicle emissions. Certain workers face employment consequences in clean energy sectors.
Environmental organizations could coordinate with unions representing clean energy workers to argue in amicus briefs that the rescission threatens job development and wage standards. Community health organizations serving low-income communities and communities of color disproportionately exposed to air pollution could emphasize health equity dimensions.
This reframes litigation from environmental principle to economic opportunity and health justice, potentially broadening support among constituencies whose political power lies outside the traditional environmental base. The Civil Rights movement demonstrated that coalition-building across labor, civil rights organizations, and religious groups substantially increased pressure on courts and political systems.
4. Launch a Multi-Year Public Engagement Campaign
Litigation campaigns succeed not only through legal arguments but through sustained public engagement that keeps issues salient and creates political consequences for actors defending challenged policies.
The coalition could establish a coordinated media strategy treating litigation as one element within a broader campaign: regular public reporting on litigation milestones, grassroots mobilization targeting judges and elected officials, coordination with climate-focused media outlets, educational campaigns explaining the stakes in accessible terms, and sustained social media presence.
The Civil Rights Movement and anti-apartheid movement showed that sustained public campaigns can shift political possibility even where courts are initially resistant.
5. Leverage International and Subnational Climate Commitments
The U.S. Climate Alliance represents 24 states committed to Paris Agreement emissions reduction goals independent of federal policy. These states represent approximately 60 percent of the U.S. economy and 55 percent of the U.S. population.
Climate groups could coordinate with state climate alliance partners and international city and regional networks like C40 Cities to create international pressure. This could include coordinated statements from allied subnational governments worldwide emphasizing how the rescission threatens global climate commitments, coordination with international environmental organizations and UN processes, and leverage of international investment and trade relationships.
Climate diplomacy precedent shows that coalitions of subnational actors can exercise diplomatic influence independent of national governments, and that international pressure creates domestic political costs for policy positions viewed as global outliers.
What the Clean Air Act History Teaches
The modern Clean Air Act, enacted in 1970, included innovative citizen suit provisions allowing private organizations to sue federal agencies for failing to perform required duties and to sue regulated entities for violations. These provisions created the possibility of sustained litigation campaigns where courts became venues for establishing environmental policy when legislative and executive pathways were blocked.
The first major environmental litigation organizations—NRDC, EDF, and others—developed sophisticated strategies based on this framework. By the 1980s and 1990s, accumulated litigation had substantially shaped how the Clean Air Act operated in practice, even where legislative action had stalled.
But litigation worked best when combined with other strategies. Courts proved most effective when legislative action had clearly authorized regulatory protection, creating a judicial role as enforcement mechanism rather than policymaker. Where legislative authorization was ambiguous, courts became venues for contested interpretations of agency power, where judicial ideology substantially determined outcomes.
Massachusetts v. EPA demonstrated litigation’s potential power—the 2007 decision overcame executive branch resistance and established the legal foundation for major regulatory initiatives. When the Obama administration took office, it promptly initiated the endangerment finding process, leading to the December 2009 finding that became the foundation for federal climate regulation.
But subsequent decisions demonstrated litigation’s limits. West Virginia v. EPA in 2022 invoked the major questions doctrine to strike down the Clean Power Plan, substantially constraining how EPA could regulate power plant emissions. The 2024 overruling of Chevron deference in Loper Light Enterprises v. Raimondo further shifted the landscape, eliminating the presumption that agency interpretations were reasonable.
These developments suggest that relying primarily on litigation has inherent limitations. Litigation can establish important precedents and prevent outright elimination of regulatory authority, but it’s vulnerable to changing Court composition, evolving doctrines, and judicial skepticism about regulatory ambition.
The Path Forward Requires Multiple Strategies
The February 2026 litigation represents a necessary but potentially insufficient strategy. The case will likely take years to resolve, moving through the D.C. Circuit in 2026-2027 before reaching the Supreme Court in 2028 or later. During that time, the rescission remains in effect.
If the 2026 midterm elections result in Democratic gains and the 2028 presidential election returns Democratic leadership to the White House, a new EPA administration could simply reverse course and reinstate the endangerment finding. This would render the litigation moot without the Supreme Court ever deciding the merits—but would itself trigger new litigation from industry groups.
Meanwhile, state-level regulatory action continues. California and other states have authority under Section 209 of the Clean Air Act to establish more stringent emissions standards than federal requirements. Several states have pledged to maintain vehicle emissions standards comparable to pre-rescission federal standards, creating a de facto patchwork.
Environmental organizations face difficult strategic choices about resource allocation. Sustaining multi-year federal appellate litigation requires substantial resources that compete with other climate priorities like clean energy investment, carbon pricing advocacy, and electoral politics.
The Clean Air Act litigation history suggests that courts are most effective when litigation is deployed as part of a broader strategy incorporating legislative action, executive branch engagement, and sustained public and political pressure. The full toolkit of democratic contestation—litigation, legislative advocacy, regulatory engagement, public pressure, and electoral politics—must work together.
The February 2026 litigation, while legally and politically significant, likely represents only the opening battle in what could be a decades-long struggle over EPA authority to regulate greenhouse gases. That struggle will be resolved not only through judicial decisions but through the accumulated effect of multiple strategies deployed simultaneously and sustained over time.
This article analyzes protest and activism tactics for educational purposes. We aim to contribute to effective and ethical efforts across the political spectrum, and we present diverse viewpoints and ideas without endorsement.