This report focuses on key trends in global climate change litigation from the calendar year 2025, while also highlighting important new developments through to May 2026. The primary source of data is the Climate Litigation Database maintained by the Sabin Center for Climate Change Law.

The authors identify the following key trends for the period January to December 2025:
• In 2025, 249 new climate cases were filed, bringing the total since 1986 to more than 3,600 cases.
• Over three quarters of these cases have been filed since 2015, the year of the Paris Agreement.
• Cases have been filed across 62 countries, up from just 17 countries a decade ago. In 2025, cases were newly filed in Grenada, Guatemala, Kazakhstan, Malaysia, Singapore and Zambia.
• The United States remains the jurisdiction with the highest number of cases: 151 new cases were recorded in 2025, bringing the total to 2,078.