Climate change is one of the defining societal challenges of the 21st century, and its impacts increasingly affect communities worldwide. By the time of EGU27, a “super El Niño” fuelled by unprecedentedly high tropical Pacific sea surface temperatures is expected to exacerbate extreme weather and rainfall patterns in many parts of the world, causing severe impacts and potentially lasting damages. Despite growing evidence, political and societal responses remain inadequate for mitigation, adaptation, and loss and damage, resulting in persistent vulnerabilities and accumulating impacts on societies and ecosystems. This shortfall in climate action has prompted citizens and organizations to pursue legal action, seeking remedies for climate-related damages and putting pressure on decision-makers to commit to and implement meaningful emission reductions. This interdisciplinary session invites contributions that advance the integration of insights from the geosciences into legal practice. We welcome new scientific methods to support legal arguments, as well as inter- and transdisciplinary approaches on the consolidation of scientific insights in climate litigation, and on the effective communication of scientific findings to legal practitioners and the broader society. Submissions may also address questions of climate change and impact attribution, responsibility, human, non-human and broader environmental rights, burden sharing of efforts, translation between science and law, and science communication, that link beyond disciplinary boundaries. Please note that all first authors of an abstract to any Programme Group (PG) within the General Assembly are allowed to also submit a second regular abstract to a Geoscience & Society (GS) session like this one.