London Climate Action Week (LCAW) harnesses the unique power of London for global and local climate action. It mobilises London’s unparalleled ecosystem of climate and non-climate organisations to accelerate global climate action and supports action in London to ensure it acts as a global climate leader. LCAW 2025 will take place from June 21 to June 29, 2025.

Now in its 7th year, LCAW is the largest city-wide climate festival in Europe, attracting over 45,000 people annually. The event provides a brand and platform under which hundreds of stakeholders host their events, creating a large and vibrant programme of climate-focused activities. This is the must-attend gathering for forward-thinking city leaders, innovative policymakers, green finance experts, and technology pioneers. The event is helping to drive change on the frontline in cities’ battle against climate change.