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Climate liability lawsuits ask courts to decide whether fossil fuel companies can be held legally responsible for alleged climate-related harm. Plaintiffs have brought different claims under different jurisdictions’ laws, and courts have reached different procedural outcomes. As of the institutional updates available through August 31, 2026, the U.S. Supreme Court’s review of Suncor Energy v. Boulder County remained a major unresolved question for U.S. state-law cases. Scientific attribution can help assess links between emissions, warming and impacts, but it does not itself establish legal liability.
What are climate liability lawsuits against fossil fuel companies?
They are cases in which plaintiffs ask a court to impose legal responsibility for alleged conduct connected to climate harms. Claims may focus on the production, promotion, marketing or sale of fossil fuels, or allege that companies misrepresented or failed to warn about climate risks. The allegations in a complaint are not findings of fact.
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“Climate litigation” is much broader than these company-liability cases: it also includes suits against governments and cases supporting or challenging climate policies. The 2025 report by the United Nations Environment Programme (UNEP) and Columbia Law School’s Sabin Center for Climate Change Law counted 3,099 climate-related cases filed in 55 national jurisdictions and 24 international or regional adjudicatory bodies as of June 30, 2025. That is a global count of climate litigation generally—not a count of lawsuits against fossil fuel companies or a measure of plaintiffs’ success.
Who brings the cases, and what do they ask courts to do?
Examples in the case summaries include cities, counties, states, tribal governments and individuals. Depending on the case and local law, plaintiffs may seek damages, an injunction, a declaration or another remedy. The requested relief is not the same in every case, and asking for a remedy does not mean a court has granted it.
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What legal theories do plaintiffs use?
The claims identified in the Sabin Center’s case materials vary by jurisdiction and pleading. They include public or private nuisance, trespass, unjust enrichment, product liability, failure to warn, and deception or consumer-protection theories. A plaintiff may bring more than one type of claim in a case.
These labels describe legal routes, not established wrongdoing. Whether a particular claim can proceed depends on what the plaintiff alleges, the governing law and the case’s procedural posture. A ruling that allows a claim to continue is not a finding that its allegations are true.
Why do courts reach different outcomes?
Courts decide the claims before them under the law and procedural rules applicable to that case. Recurring disputes include whether the court has jurisdiction, whether the plaintiff has standing and a legally cognizable injury, whether the defendant owed an enforceable duty, how causation should be shown, whether a claim is timely, and whether federal law precludes or otherwise displaces a state-law claim. The legal availability of the requested remedy can also be contested.
Procedural stage matters. A decision on a motion to dismiss, removal or remand, or a request to pause a case does not resolve the same question as a trial or final judgment on liability. The examples below illustrate different rulings in different cases; they should not be treated as a single nationwide rule.
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| Case or group | Jurisdiction and development | What the ruling does—and does not—establish |
|---|---|---|
| Suncor Energy (U.S.A.) Inc. v. County Commissioners of Boulder County | The U.S. Supreme Court granted review on February 23, 2026, of a Colorado Supreme Court decision allowing Colorado state-law claims to proceed. The questions include whether federal law precludes state-law claims for alleged injuries from interstate and international greenhouse-gas emissions; the Court also requested briefing on its jurisdiction. In an April 2026 update, the Sabin Center reported briefing scheduled to support a hearing in the October 2026 sitting. | The Supreme Court review puts the treatment of these state-law claims in focus. The institutional updates available through August 31, 2026, do not report a decision on the merits. |
| Maryland local-government cases | On March 24, 2026, Maryland’s highest court affirmed dismissal of local governments’ state common-law claims against fossil fuel companies. | This ruling concerns the claims and legal basis before that court; it does not resolve every other climate case. |
| Shoalwater Bay and Makah Indian Tribes cases | In April 2026, a Washington Superior Court denied companies’ motions to dismiss state-law claims, including nuisance and product-liability claims, and denied requests to stay some proceedings. | The trial-level ruling allowed the claims to continue. It was not a final judgment imposing liability. |
| Chicago climate-deception case | A July 2026 Sabin Center update reported that the U.S. Court of Appeals for the Seventh Circuit affirmed remand of the case to state court. | The reported ruling concerns where the case proceeds, not a final determination of liability. |
The Supreme Court’s review in Suncor is therefore important, but it should not be mistaken for a nationwide merits ruling. Case updates through August 31, 2026, describe an active field with differing decisions on dismissal, remand and stays.
What can attribution science show—and what can’t it decide?
Attribution research can evaluate connections between human-caused greenhouse-gas emissions, rising temperatures and particular climate impacts. Depending on the question and evidence, it may help assess the contribution of emissions to warming or an impact and inform evidence concerning harm.
Scientific attribution alone does not decide whether a defendant owed a legal duty, whether a particular cause of action applies, whether the plaintiff has standing, how responsibility should be apportioned, whether a defense succeeds or what remedy is available. A scientific estimate of contribution is not automatically a judicial finding of legal responsibility.
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In an analysis published June 17, 2026, the Sabin Center stated that, as of that date, no court anywhere had imposed financial liability on a country or company because of greenhouse-gas emissions. This is a time-bounded statement specifically about financial liability for emissions. It does not mean that no climate-related court decisions have been issued: courts have made procedural rulings, and claims seeking financial liability remain pending.
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How should readers interpret case status and counts?
For any individual case, check the jurisdiction, legal theory, requested relief and procedural posture rather than relying on the broad label “climate lawsuit.” A motion ruling may decide whether a claim can continue without deciding whether the defendant is liable; an appellate ruling on remand or a stay answers a different question again. The Sabin Center’s case updates through August 31, 2026, provide a dated snapshot, and litigation status can change after an update.
The global total from UNEP and the Sabin Center is useful for understanding the scale of climate litigation, but it does not measure the number of company-liability suits, their outcomes or how many plaintiffs have prevailed. The count covers cases across national and international or regional adjudicatory bodies as of June 30, 2025.
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