Data story: Global climate litigation cases, outcomes, and trend lines

Why It Matters

More than 2,900 climate-related lawsuits have been filed worldwide as of early 2026, nearly doubling the total recorded just five years ago (Grantham Research Institute, 2025). Climate litigation has evolved from a niche strategy pursued by activist organizations into a systemic force reshaping corporate governance, national policy, and financial risk assessment. The Sabin Center for Climate Change Law at Columbia University documented 252 new cases filed in 2025 alone, spanning 58 jurisdictions, with cases now emerging in the Global South at an accelerating pace (Sabin Center, 2026). For sustainability professionals, tracking the data behind these cases reveals where legal pressure is concentrating, which legal theories produce results, and how court decisions translate into measurable emissions reductions and policy shifts. Understanding these trend lines is essential for anticipating regulatory risk and building credible corporate climate strategies.

Key Concepts

Case volume trajectory. The cumulative count of climate litigation cases worldwide crossed 1,000 for the first time in 2017. By 2022 that number had reached approximately 2,180, and by the close of 2025 it stood at roughly 2,900 (Grantham Research Institute, 2025). The compound annual growth rate over the past five years has averaged 12%, driven by expanding legal standing doctrines, new human rights frameworks, and growing scientific attribution capabilities.

Jurisdictional distribution. The United States remains the single largest jurisdiction, hosting approximately 1,590 cases or 55% of the global total (Sabin Center, 2026). However, the fastest growth is now outside North America. The European Union accounted for 18% of new filings in 2025, with Germany, the Netherlands, and France leading. Cases in the Global South have tripled since 2020, with Brazil, Colombia, India, Pakistan, and South Africa emerging as active arenas. The International Court of Justice and the Inter-American Court of Human Rights issued advisory opinions in 2024 and 2025 that have expanded the legal foundations for cases in developing nations (UNEP, 2025).

Legal theories in use. Climate cases generally fall into several categories. Constitutional and human rights claims, which argue that governments have a duty to protect citizens from climate harm, accounted for 37% of cases decided favorably between 2020 and 2025 (Joana Setzer and Catherine Higham, 2023). Tort and negligence claims target fossil fuel companies and other large emitters. Regulatory enforcement actions challenge inadequate implementation of existing climate laws. Corporate disclosure and greenwashing claims, which surged 150% between 2022 and 2025, target misleading sustainability marketing and reporting (ClientEarth, 2025).

Win rates and outcomes. Analyzing the subset of cases that have reached a decision, approximately 54% have produced outcomes favorable to climate action, while 35% favored the defendant and 11% resulted in mixed or procedural outcomes (Grantham Research Institute, 2025). Win rates vary significantly by legal theory. Human rights-based claims against governments have yielded favorable outcomes in roughly 65% of decided cases since 2015. Corporate disclosure and greenwashing cases have a lower but rising success rate of approximately 42%.

Attribution science as evidence. Courts increasingly accept climate attribution science, which links specific weather events or warming trends to particular emitters or emission volumes. The World Weather Attribution initiative has provided expert testimony or evidence in at least 30 cases since 2023, and courts in Germany, the Netherlands, and Australia have cited attribution studies in their rulings (World Weather Attribution, 2025).

What's Working and What Isn't

Progress. Government-facing litigation continues to produce landmark policy shifts. The Dutch Supreme Court upheld the Urgenda ruling requiring the Netherlands to cut emissions by 25% below 1990 levels by 2020, and the government met the target. Germany's Federal Constitutional Court decision in 2021 prompted the government to accelerate its 2030 reduction target from 55% to 65%. In 2024, the European Court of Human Rights ruled in KlimaSeniorinnen v. Switzerland that the Swiss government had violated citizens' rights by failing to act adequately on climate change, establishing binding precedent across 46 Council of Europe member states (ECHR, 2024). Corporate-facing cases are also gaining traction. The Hague District Court's 2021 order requiring Shell to cut its absolute emissions 45% by 2030 has survived initial appeal proceedings and influenced investor expectations across the oil and gas sector. In 2025, a French court upheld findings against TotalEnergies for inadequate climate planning under France's duty of vigilance law (ClientEarth, 2025).

Greenwashing enforcement is accelerating. The Australian Federal Court's ruling against Santos in 2024 for describing its gas operations as "clean energy" set a precedent for advertising standards. The European Commission's Green Claims Directive, entering force in 2026, was partly motivated by the wave of litigation exposing unsubstantiated sustainability marketing.

Challenges. Despite rising case volumes, enforcement of favorable rulings remains inconsistent. Courts can declare government targets inadequate, but compelling specific policy changes or spending allocations is difficult. In Brazil, the Supreme Federal Tribunal ruled in 2024 that the government's deforestation fund must be fully disbursed, but implementation has been slow due to institutional capacity constraints (Climate Observatory Brazil, 2025). Tort cases against fossil fuel companies face jurisdictional hurdles, with defendants frequently arguing that climate change is a political question unsuitable for judicial resolution. In the United States, several municipal lawsuits against major oil companies have been delayed by years of procedural battles over whether cases belong in state or federal court. The financial costs of litigation also create access barriers, particularly for communities in the Global South that bear the greatest climate impacts but have the fewest legal resources. Cases in low-income jurisdictions often depend on funding from international NGOs, raising questions about sustainability and local ownership.

Key Players

Established Leaders

• ClientEarth — Europe's leading environmental law organization, involved in over 80 climate cases across 15 jurisdictions.
• Sabin Center for Climate Change Law (Columbia University) — Maintains the global climate litigation database tracking all known cases.
• Grantham Research Institute (London School of Economics) — Publishes annual global trends reports on climate litigation outcomes.
• Earthjustice — Largest nonprofit environmental law firm in the United States, representing plaintiffs in major fossil fuel cases.

Emerging Startups

• Vested Rights — Legal-tech platform providing climate litigation risk analytics to institutional investors and insurers.
• Plan A — Carbon accounting platform integrating litigation risk exposure into corporate emissions management.
• Climate Rights International — Founded in 2024, brings human rights investigation methods to climate accountability cases.

Key Investors/Funders

• Children's Investment Fund Foundation (CIFF) — Major funder of strategic climate litigation globally, providing over $50 million since 2020.
• ClimateWorks Foundation — Funds climate litigation capacity building in the Global South.
• European Climate Foundation — Supports legal organizations pursuing systemic climate cases across Europe.

Examples

Milieudefensie v. Shell (Netherlands). In May 2021, the Hague District Court ordered Royal Dutch Shell to reduce its global CO2 emissions by 45% by 2030 relative to 2019 levels, covering not only the company's own operations but also the emissions from its products. This was the first time a court ordered a private company to align its climate strategy with the Paris Agreement. Shell appealed, but the case has already influenced shareholder resolutions and strategic planning across the fossil fuel sector (Milieudefensie, 2025).

KlimaSeniorinnen v. Switzerland (ECHR). In April 2024, the European Court of Human Rights ruled that Switzerland's failure to meet its climate targets violated the European Convention on Human Rights. The ruling applies to all 46 member states of the Council of Europe and establishes that governments have a positive obligation to adopt and implement adequate climate legislation. Legal scholars consider this the most consequential climate ruling in European history (ECHR, 2024).

Held v. State of Montana (United States). In August 2023, a Montana state court ruled that the state's policy of approving fossil fuel projects without considering their climate impacts violated young plaintiffs' constitutional right to a clean and healthful environment. The case was the first successful constitutional climate trial in the United States. Although Montana has appealed, the ruling has inspired similar constitutional challenges in other U.S. states, including Hawai'i and Utah (Our Children's Trust, 2025).

Santos Greenwashing Case (Australia). In 2024, the Australian Federal Court found that Santos, one of Australia's largest gas producers, had engaged in misleading conduct by describing its operations as producing "clean energy" and presenting a pathway to net zero emissions that relied on unproven carbon capture technology. The ruling established that corporate net-zero plans can be subject to consumer protection law scrutiny (ACCR, 2024).

Action Checklist

• Audit corporate climate claims. Review all public sustainability communications, net-zero commitments, and advertising for accuracy against the emerging greenwashing case law and the EU Green Claims Directive requirements.
• Integrate litigation risk into climate strategy. Include climate litigation exposure in enterprise risk management frameworks, board reporting, and annual financial disclosures.
• Monitor attribution science developments. Track publications from the World Weather Attribution initiative and similar bodies, as courts increasingly accept attribution evidence linking specific harm to emitters.
• Engage legal counsel proactively. Retain climate law specialists to assess exposure before lawsuits are filed rather than reacting after complaints emerge.
• Support supply chain transparency. Ensure scope 3 emissions data is robust enough to withstand legal scrutiny, as courts and regulators increasingly examine value chain claims.
• Track jurisdictional developments. Monitor rulings in key jurisdictions including the EU, UK, Australia, and the United States, as precedent from one court frequently influences others.

FAQ

How many climate litigation cases exist globally? As of early 2026, the Grantham Research Institute and Sabin Center databases record approximately 2,900 climate-related cases across more than 60 jurisdictions. The United States accounts for about 55% of all cases, but filings are growing fastest in Europe, Latin America, and South and Southeast Asia.

What percentage of climate cases succeed? Among cases that have reached a decision, roughly 54% produce outcomes favorable to climate action (Grantham Research Institute, 2025). Success rates vary by legal theory: human rights-based claims against governments succeed approximately 65% of the time, while tort claims against corporations have lower but improving win rates.

Can courts actually force companies to cut emissions? Yes. The Milieudefensie v. Shell ruling in 2021 ordered Shell to reduce its absolute emissions by 45% by 2030, covering operations and product use. While enforcement mechanisms vary by jurisdiction, court orders create legal obligations that companies ignore at the risk of contempt proceedings and further liability.

What is climate attribution science and how does it affect litigation? Climate attribution science uses statistical and physical modeling to determine the extent to which climate change or specific extreme weather events can be attributed to human activities or particular emitters. Courts in Germany, the Netherlands, Australia, and the United States have admitted attribution evidence, making it easier for plaintiffs to establish a causal link between defendant conduct and climate harm.

Are greenwashing lawsuits increasing? Yes, substantially. Greenwashing and misleading climate claims cases grew 150% between 2022 and 2025 (ClientEarth, 2025). The EU Green Claims Directive, which takes effect in 2026, is expected to accelerate enforcement further by requiring companies to substantiate environmental marketing claims with verified scientific evidence.

Sources

• Grantham Research Institute on Climate Change and the Environment. (2025). Global Trends in Climate Change Litigation: 2025 Snapshot. London School of Economics.
• Sabin Center for Climate Change Law. (2026). Climate Change Litigation Databases: Global Case Tracker. Columbia Law School.
• UNEP. (2025). Global Climate Litigation Report: 2025 Status Review. United Nations Environment Programme.
• Setzer, J. and Higham, C. (2023). Global Trends in Climate Change Litigation: 2023 Snapshot. Grantham Research Institute, London School of Economics.
• ClientEarth. (2025). Greenwashing Litigation Tracker: Case Trends and Enforcement Outcomes. ClientEarth.
• European Court of Human Rights. (2024). KlimaSeniorinnen v. Switzerland, Application No. 53600/20, Grand Chamber Judgment.
• World Weather Attribution. (2025). Attribution Science in Courts: A Review of Expert Evidence in Climate Litigation.
• ACCR (Australasian Centre for Corporate Responsibility). (2024). Santos Federal Court Decision: Implications for Corporate Climate Claims.
• Our Children's Trust. (2025). Held v. State of Montana: Case Summary and Ongoing Proceedings.
• Milieudefensie. (2025). Shell Climate Case: Timeline, Ruling, and Corporate Response.
• Climate Observatory Brazil. (2025). Amazon Fund Disbursement Compliance: Implementation Status Report.