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This report provides a numerical analysis of how many climate change litigation cases were filed in 2023, where and by whom, and a qualitative assessment of trends and themes in the types of cases filed. It is the sixth report in the series, produced by the Grantham Research Institute in partnership with the Sabin Center for Climate Change Law and drawing on the Sabin Center's Climate Change Litigation Databases. Each report provides a synthesis of the latest research and developments in the climate change litigation field. An eight-page summary policy brief is also available.

Key findings include:

• The field of climate litigation continues to grow and diversify but the number of new cases filed each year may be stabilising.
• The slowdown could be due to a shift towards fewer, more strategic cases – but it may be temporary.
• Despite the apparent stabilisation in new case filings, significant divergence within climate litigation persists. Trends such as the growth in Environmental, Social and Governance (ESG) backlash litigation might spread to other jurisdictions.
• Overall, whether climate litigation is advancing or hindering climate action remains difficult to determine. Both types of cases can and must be understood as part of the wider constellation of climate cases. 
• This broader phenomenon continues to drive shifts in thinking and behaviour among many stakeholder groups, ranging from the courts and the legal profession to legislators and regulators, financiers and insurers. Understanding the nuance and scope of these changes remains an urgent challenge.