IIGCC: 3,600 Climate Cases in 62 Countries — Climate-Washing Now Most Common Corporate Category, 65%+ Win Rate for Claimants; Data Centres and Plastics Emerging

The IIGCC's July 2026 analysis of the LSE Grantham Institute 2026 snapshot identifies five themes defining the current phase of climate litigation: maturity, expansion, pushback, complexity, and implementation impact. More than 3,600 climate cases have been filed across 62 countries; 249 new cases were filed in 2025, including first-ever filings in Grenada, Guatemala, Kazakhstan, Malaysia, Singapore, and Zambia. Climate-washing is now the most common type involving corporate actors, with over 65% of decided cases ruled in favour of claimants — establishing that the legal standard for credible climate transition communications is now higher than it was five years ago. Approximately half of 30 systemic polluter-pays and corporate framework cases that received a significant admissibility decision have proceeded beyond initial procedural hurdles; no such case has yet produced a final upheld damages order, but financial markets now treat these cases as material risk. Emerging litigation fronts: data centres (Ireland, UK, US — the climate and planning interface); carbon dioxide removal and storage infrastructure (Louisiana, New Zealand, Finland, EU); and the climate-plastics interface (US state regulators against Coca-Cola, PepsiCo, and ExxonMobil). Vanguard's February 2026 settlement — committing to withdraw from climate coalitions without admitting liability — illustrates that the most consequential effects of climate litigation can occur without a final judgment. For law firm ESG practice leaders: the 65%+ climate-washing win rate for claimants is the data point most relevant to client communications review work. The standard now requires transition plans to include clear, objective, publicly available, and verifiable targets (Greenpeace France v. TotalEnergies, Paris October 2025, anchored in the 2024 EU Directive on Empowering Consumers for the Green Transition). Generic net-zero claims without plan-level support are not legally adequate.