Municipalities play a strategic role in addressing climate change. They drive developments and act as role models for successful measures in greenhouse gas emissions reduction. To highlight local potential and achievements and to support mutual know how-transfer on policies and implementation, Germany will host the International Conference on Climate Action (ICCA2015). The conference is organized by the German Federal Ministry for the Environment, Nature Conservation, Building and Society (BMUB), the ministry for the Environment, Energy and Climate Protection of Lower Saxony and the German Institute for Urban Affairs (Difu).