In this project we analysed the EU product environmental footprint (PEF) methodology, the state of databases on climate footprints, the current knowledge on effective label design, and relevant EU regulation. The basis for our analysis was that an effective climate labelling scheme will require a methodology, a database, and a label format that allows consistent comparison both within and across product categories. On this basis we identified the necessary preconditions and suggested a way forward in a study report. The Options Brief (short document for policy makers) can be accessed as an annex from the study at the project website of the European Parliament.