The Lusaka Declaration, one of the key outcomes of the CLARExchange Forum 2025, calls for immediate action to move from evidence to impact. This Declaration focuses on evidence to action recommendations for climate resilience in informal settlements. From 6–9 May 2025, over 200 scientists, policymakers, practitioners, community leaders, and community residents from the Climate Adaptation and Resilience (CLARE) community gathered in Lusaka for four days to exchange knowledge and insights on actionable evidence from across projects supported by the CLARE Programme.