On February 23, 2026, the U.S. Supreme Court granted certiorari in *Suncor Energy (U.S.A.) Inc. v. County Commissioners of Boulder County*, agreeing for the first time to hear oil and gas companies’ arguments that federal law should block state-level climate change lawsuits. The case pits ExxonMobil Corporation and Suncor Energy against the City of Boulder and Boulder County, Colorado, and the Court’s decision could determine whether nearly 60 similar lawsuits filed by state and local governments across the country survive or get thrown out.
This is not a hypothetical legal skirmish — billions of dollars in potential damages hang in the balance. The stakes extend well beyond Colorado. States including California, Connecticut, Delaware, Hawaii, Maine, Massachusetts, Michigan, Minnesota, New Jersey, Rhode Island, and Vermont, along with numerous cities, counties, and tribal governments, have filed climate accountability lawsuits against fossil fuel companies. These cases seek to recover costs tied to wildfires, rising sea levels, severe storms, and drought — harms plaintiffs say the industry knowingly worsened while misleading the public. This article covers the legal questions at the heart of the case, the timeline for a decision, the controversy over Justice Alito’s refusal to recuse himself, and what a ruling could mean for the broader landscape of climate litigation in America.
Table of Contents
- Why Did the Supreme Court Agree to Hear the Oil and Gas Industry’s Challenge to Climate Change Lawsuits?
- What Are Boulder’s Claims Against Exxon and Suncor — and What Are Their Limits?
- The Jurisdictional Question the Court Added on Its Own
- The Timeline — When Will This Be Decided and What Should Stakeholders Expect?
- Justice Alito’s Recusal Controversy and What It Signals
- How Nearly 60 Climate Lawsuits Could Rise or Fall on One Decision
- What Comes Next for Climate Accountability Litigation
- Conclusion
- Frequently Asked Questions
Why Did the Supreme Court Agree to Hear the Oil and Gas Industry’s Challenge to Climate Change Lawsuits?
The companies asked the Supreme Court to resolve a straightforward but consequential question: does federal law, including the Clean Air Act, preempt state-law claims that seek relief for injuries caused by greenhouse gas emissions and their effects on the global climate? In plain terms, ExxonMobil and Suncor argue that because greenhouse gas emissions are regulated at the federal level, state courts have no business adjudicating climate damage claims. If the Court agrees, it would effectively shut down the legal theory underpinning dozens of active lawsuits. The case arrived at the Supreme Court after the Colorado Supreme Court ruled in May 2025 that federal law did not preempt Boulder’s claims and that the lawsuit could proceed under state law. That was a significant loss for the industry. Exxon and Suncor had already tried once before to get the justices’ attention — filing an earlier, unsuccessful petition for certiorari in April 2023 on a related procedural question about whether the case should be remanded to state court.
This time, the Court took the bait. The difference matters: the 2023 petition dealt with procedure, while the 2026 grant goes to the substance of whether these lawsuits can exist at all. Compare this to how the tobacco industry fought state-level lawsuits in the 1990s. Big Tobacco similarly argued that federal regulation of cigarettes preempted state tort claims. Courts ultimately rejected that argument, and states recovered hundreds of billions of dollars in settlements. The fossil fuel industry is now making a structurally similar play, and the Supreme Court’s willingness to hear the case suggests at least some justices believe the preemption argument has merit.
What Are Boulder’s Claims Against Exxon and Suncor — and What Are Their Limits?
Boulder County and the City of Boulder allege that ExxonMobil and Suncor knowingly contributed to climate change while actively misleading the public about its impacts. Their legal claims include public nuisance, private nuisance, trespass, unjust enrichment, and civil conspiracy. The theory is not that burning fossil fuels is illegal — it is that the companies knew their products were causing environmental harm, suppressed or distorted that information, and should pay for the resulting damage. However, there is an important limitation built into these cases. They do not seek to ban fossil fuel production or force companies to reduce emissions.
They seek monetary damages to cover costs that local governments have already incurred or expect to incur — adapting infrastructure for rising seas, fighting intensified wildfires, managing drought conditions. This distinction is critical because it means even a favorable ruling for Boulder would not directly regulate the industry. It would, however, create a financial incentive for companies to internalize the costs of climate change rather than passing them to taxpayers. The industry’s strongest counterargument is that climate change is an inherently global problem caused by emissions from billions of sources worldwide, making it impossible to draw a clean causal line between any single company’s conduct and Boulder’s specific harms. If the Supreme Court finds that the global nature of the problem means federal law must govern, state-level claims could be dead on arrival — not just in Colorado, but everywhere.
The Jurisdictional Question the Court Added on Its Own
Beyond the preemption issue, the Supreme Court introduced a secondary question that neither party initially asked the justices to consider: whether the Court has proper statutory and Article III jurisdiction to hear the case at this stage. Boulder argues that the Colorado Supreme Court’s decision is not a “final judgment” — meaning the case has not fully concluded in state court and the Supreme Court may be stepping in prematurely. This is not just a technicality. If the Court concludes it lacks jurisdiction, it would dismiss the case without reaching the preemption question at all.
That outcome would leave the Colorado Supreme Court’s ruling intact, allowing Boulder’s lawsuit to proceed, and would punt the larger preemption question to a future case. For the dozens of other jurisdictions with pending climate lawsuits, a jurisdictional dismissal would mean continued uncertainty but also continued life for their claims. The Court’s decision to ask for briefing on jurisdiction is notable because it signals that at least some justices may be looking for an off-ramp — a way to avoid ruling on the merits of preemption while still appearing responsive to the industry’s concerns. Litigants and observers should not assume the Court will reach the big question just because it granted certiorari.
The Timeline — When Will This Be Decided and What Should Stakeholders Expect?
Briefing in *Suncor v. Boulder County* is expected to take place over the spring and summer of 2026. Oral arguments are anticipated during the first week of the October 2026 term, with a decision expected before July 2027. That is a long runway, and in the meantime, other climate lawsuits around the country will continue to develop — though some courts may choose to pause proceedings while waiting for the Supreme Court’s guidance. The tradeoff for plaintiffs is stark. On one hand, a Supreme Court ruling in their favor would be the strongest possible validation of state-level climate litigation and would green-light cases across the country.
On the other hand, a ruling for the industry would be devastating, potentially wiping out years of legal work and billions in potential recoveries. There is no middle ground that satisfies both sides. Local governments pursuing these cases are betting that the legal theory can survive the highest court in the land — but they are also exposed to the risk that it cannot. For the oil and gas industry, the timeline creates its own strategic considerations. Even if the companies ultimately win at the Supreme Court, they will have spent years and significant legal fees defending against these claims. And a loss would open the floodgates further, with potentially dozens more jurisdictions emboldened to file suit.
Justice Alito’s Recusal Controversy and What It Signals
Justice Samuel Alito did not recuse himself from *Suncor v. Boulder County*, despite owning stock in ConocoPhillips and Phillips 66 — companies that are defendants in similar climate lawsuits that could be directly affected by the Court’s ruling. This is particularly striking because Alito had recused himself from the same case when the companies filed their earlier, unsuccessful certiorari petition in 2023. He offered no public explanation for reversing that position. The recusal question is not academic. Supreme Court justices are not bound by the same mandatory recusal rules that apply to lower court judges, and there is no mechanism to force a justice off a case.
But the appearance of a conflict of interest is difficult to ignore when a justice with financial ties to the fossil fuel industry participates in a case that could determine the financial exposure of that same industry. Critics have pointed out that if Alito’s participation affects the outcome — particularly in a close vote — the legitimacy of the decision will be questioned regardless of its legal reasoning. This situation highlights a broader limitation of the Supreme Court’s ethics framework. Unlike lower courts, the Supreme Court has historically operated on an honor system when it comes to recusals. Congress passed the Supreme Court Ethics, Recusal, and Transparency Act in committee in 2023, but the legislation has not become law. Until enforceable recusal standards exist, controversies like this one will continue to shadow high-profile cases.
How Nearly 60 Climate Lawsuits Could Rise or Fall on One Decision
The sheer number of jurisdictions with active climate lawsuits makes the Supreme Court’s decision in this case uniquely consequential. Nearly 60 state and local governments have filed similar claims against oil companies. California alone has multiple pending cases, and states from New England to the Pacific Northwest are pursuing damages for climate-related harms ranging from coastal erosion to agricultural losses.
If the Court rules that federal law preempts these state-law claims, all of these cases could be effectively gutted. Consider the practical example of a coastal city that has spent tens of millions of dollars building seawalls and elevating roads to deal with rising sea levels. If the Court rules for the industry, that city’s lawsuit seeking to recover those costs from fossil fuel companies would likely fail — and taxpayers would bear the full financial burden of climate adaptation. Conversely, if the Court rules for Boulder, cities and states would have a validated legal path to shift at least some of those costs to the companies whose products contributed to the problem.
What Comes Next for Climate Accountability Litigation
Regardless of how the Supreme Court rules, *Suncor v. Boulder County* will not be the final word on climate accountability. If the Court sides with the industry on preemption grounds, plaintiffs’ attorneys will likely pivot to new legal theories — potentially focusing more narrowly on consumer fraud, deceptive marketing, or securities disclosures rather than on the emissions themselves.
The tobacco litigation analogy is instructive here: early lawsuits failed repeatedly before attorneys found the legal strategies that eventually succeeded. If the Court sides with Boulder, or dismisses the case on jurisdictional grounds, the litigation will accelerate. More jurisdictions will file suit, settlement pressure on the industry will increase, and the political dynamics around climate policy will shift. Either way, the era of fossil fuel companies facing no financial accountability for climate change appears to be ending — the only question is how quickly and through what legal mechanism.
Conclusion
The Supreme Court’s decision to hear *Suncor Energy (U.S.A.) Inc. v. County Commissioners of Boulder County* marks a turning point in the decades-long effort to hold fossil fuel companies financially accountable for climate change. With nearly 60 state and local governments pursuing similar claims seeking billions in damages, the Court’s ruling — expected before July 2027 — will shape the future of climate litigation in the United States.
The central question of whether federal law preempts state-level climate claims is one the lower courts have largely answered in favor of plaintiffs, and the industry is now asking the Supreme Court to reverse that trend. For consumers, taxpayers, and local governments already paying for climate adaptation, this case is about who bears the cost. The recusal controversy surrounding Justice Alito, the jurisdictional question the Court raised on its own, and the sheer volume of pending litigation all add layers of uncertainty. What is certain is that the outcome will have real financial consequences — for the fossil fuel industry, for the municipalities suing them, and for the public that ultimately pays either way. Anyone following climate policy, energy markets, or government accountability should watch this case closely as briefing unfolds through the summer of 2026.
Frequently Asked Questions
What is the *Suncor v. Boulder County* case about?
The case asks the U.S. Supreme Court to decide whether federal law, including the Clean Air Act, preempts state-law claims seeking damages for injuries caused by greenhouse gas emissions and their effects on the global climate. ExxonMobil and Suncor argue federal law blocks these state-level lawsuits; Boulder County argues its claims can proceed under state law.
When will the Supreme Court issue a decision?
Briefing is expected over the spring and summer of 2026, with oral arguments anticipated in the first week of the October 2026 term. A decision is expected before July 2027.
How many climate lawsuits could be affected by this ruling?
Nearly 60 state and local governments have filed similar climate lawsuits against oil companies, and the Supreme Court’s ruling could determine the fate of several dozen of these pending cases nationwide. Plaintiff jurisdictions include states like California, Connecticut, Massachusetts, and Minnesota, among many others.
Why is Justice Alito’s participation controversial?
Justice Alito owns stock in ConocoPhillips and Phillips 66, companies that are defendants in similar climate lawsuits. He recused himself from an earlier petition in the same case in 2023 but chose to participate this time without offering a public explanation for the change.
What are Boulder’s specific legal claims against the oil companies?
Boulder County and the City of Boulder allege public nuisance, private nuisance, trespass, unjust enrichment, and civil conspiracy. They claim the companies knowingly contributed to climate change while misleading the public about its impacts.
Could the Supreme Court avoid ruling on the main legal question?
Yes. The Court asked for briefing on whether it has proper jurisdiction to hear the case at this stage. If the Court finds it lacks jurisdiction — for example, because the Colorado Supreme Court’s decision is not a “final judgment” — it could dismiss the case without addressing whether federal law preempts state climate claims.