The ICAP Status Report 2015 is a comprehensive review of emissions trading worldwide. The report was prepared by the International Carbon Action Partnership (ICAP) and its editorial team, which includes Camille Serre, Marissa Santikarn, Kateryna Stelmakh, Alexander Eden, Michel Frerk, Aki Kachi, Charlotte Unger, Kristian Wilkening, and Constanze Haug. The report provides insights into the current state of emissions trading and its potential for reducing greenhouse gas emissions. The ICAP Secretariat is grateful to policy-makers and collaborators from the emissions trading field for their contributions to the report. The report was funded by the German Federal Ministry for the Environment, Nature Conservation, Building and Nuclear Safety (BMUB) and adelphi consult GmbH provided scientific and technical support.