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Climate liability lawsuits against fossil fuel companies ask courts to hold companies legally responsible for alleged climate-related harms. Plaintiffs have brought claims under different laws and sought different remedies; a complaint is not proof of liability, and procedural rulings allowing a case to continue are not final judgments. As of the Sabin Center’s June 17, 2026 analysis, no court anywhere had imposed financial liability on a country or company because of greenhouse gas emissions.
What are climate liability lawsuits against fossil fuel companies?
They are lawsuits in which plaintiffs argue that fossil fuel companies’ conduct—such as producing, promoting, marketing, or selling fossil fuels, or allegedly concealing or failing to warn about climate risks—contributed to harm for which the companies should be legally responsible. Plaintiffs have included cities, counties, states, tribal governments, and individuals. Depending on the case and local law, they may seek damages, an injunction, a declaration, or another available remedy.
The phrase climate litigation covers much more than these company-liability claims. It also includes cases against governments and litigation supporting or challenging climate policies. The United Nations Environment Programme 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 count of climate litigation broadly, not of fossil-fuel-company lawsuits or successful claims.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallWhat legal claims do plaintiffs bring?
Theories differ by jurisdiction, complaint, and governing law. The following are types of claims reported in this litigation; their presence in a complaint does not mean a court has found the alleged conduct occurred or that the claim is legally valid.
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- Nuisance: Plaintiffs may allege that conduct interfered with public rights or with the use and enjoyment of property.
- Trespass: A plaintiff may allege an unlawful invasion of property, subject to the elements required by the applicable law.
- Product liability or failure to warn: Claims may focus on the products sold and alleged failures to warn about risks.
- Deception or consumer protection: A plaintiff may allege that a company misrepresented or concealed information about climate risks.
- Other routes: Reported claims also include unjust enrichment and private nuisance.
Which claims are available—and what a plaintiff must prove—depends on the jurisdiction and the specific facts pleaded. Cases should not be treated as equivalent just because they concern climate change.
Why do courts reach different procedural outcomes?
A case can end, continue, or move between courts for reasons that do not decide whether a company ultimately caused a particular injury or owes damages. Courts may address jurisdiction, standing and the nature of a plaintiff’s injury, whether the law recognizes an applicable duty, causation, timeliness, defenses, or whether the requested remedy is legally available. In U.S. cases, whether federal law displaces or precludes state-law claims tied to interstate and international greenhouse-gas emissions is a central contested issue.
Procedure matters. A motion to dismiss tests whether claims can proceed under applicable legal standards; denial of such a motion is not a finding of liability. A ruling on removal or remand addresses which court hears a case, not necessarily its merits. A stay pauses proceedings. Appellate review may affirm or reverse a ruling without deciding every factual question. Only a final merits judgment can resolve liability in the case, and the relevant legal issues remain case-specific.
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What is the status of major U.S. cases?
The cases below illustrate distinct procedural outcomes. Status is stated from institutional updates available through August 31, 2026; litigation can change quickly.
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| Case or group | Update and posture | What the ruling does—and does not—establish |
|---|---|---|
| Suncor Energy (U.S.A.) Inc. v. County Commissioners of Boulder County | On February 23, 2026, the U.S. Supreme Court granted review of the Colorado Supreme Court decision allowing Colorado state-law claims to proceed. The question includes whether federal law precludes state-law claims seeking relief for injuries allegedly caused by 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 in support of a hearing in the October 2026 sitting. | The Supreme Court had not decided the merits in the updates through August 31, 2026. Its review is a major source of uncertainty for U.S. state-law cases, but the eventual decision should not be presumed. |
| 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 resolved the claims before that court on their legal basis; it is not a nationwide ruling disposing of other cases. |
| Shoalwater Bay and Makah Indian Tribes’ cases in Washington | 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. | This trial-level ruling allowed claims to continue. It did not decide final liability or damages. |
| Chicago climate-deception case | A July 2026 Sabin Center update reported that the Seventh Circuit affirmed remand of the case to state court. | The update concerned the case’s court and procedural path, not a final finding that the defendants were liable. |
These contrasting decisions arise from different plaintiffs, pleadings, laws, and procedural questions. One court’s ruling should not be read as a single national rule for every climate case.
What can attribution science establish?
Attribution science studies links between human-caused emissions, warming, and particular climate impacts. It can help evaluate whether human influence contributed to warming or an event, and can inform evidence about emissions contributions and alleged harm. Its findings may be relevant to factual questions in litigation.
Scientific attribution does not itself 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 among actors, whether a defense succeeds, or what remedy a court may award. A scientific estimate connecting emissions to warming or an impact is not, by itself, a judicial finding that a company is legally liable for a plaintiff’s loss.
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Have courts ordered fossil fuel companies to pay climate damages?
In a June 17, 2026 analysis, the Sabin Center stated that, as of that date, no court anywhere had imposed financial liability on any country or company because of greenhouse gas emissions. This is a time-bounded statement specifically about financial liability for emissions. It does not mean courts have issued no climate-related decisions: courts have ruled on procedural questions and on other kinds of climate claims, while cases seeking financial liability remain pending.
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How should readers compare these cases?
Rather than grouping every climate-related case together, compare the details that determine what is actually at stake:
- Jurisdiction and governing law: Identify the country, court, and legal rules that apply.
- Claim theory: Distinguish emissions-related tort claims from alleged deception, failure-to-warn, product-liability, or other claims.
- Procedural posture: Check whether the court is considering dismissal, removal or remand, a stay, an appeal, trial, or a final judgment.
- Relief requested: Separate demands for damages from requests for an injunction, declaration, or other relief.
- Evidence and causation: Ask what evidence concerns event attribution, a company’s emissions contribution, alleged knowledge or marketing, and the link to the plaintiff’s specific injury.
The Sabin Center’s case database and the UNEP/Sabin Center 2025 report provide institutional resources for tracking the wider field. The global case count is useful context, but it does not show how many fossil-fuel-company plaintiffs have prevailed.
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