The study has three main parts: After the introduction, section 4 explores whether and to what extent it is useful and feasible to have a single definition of geoengineering for governance purposes. section 5 analyses the existing governance of geoengineering in international law,
with a brief overview of EU and German law. On this basis, section 6 develops specific regulatory options and proposals. We analyse why governance of geoengineering should be pursued and develop specific proposals how such governance should be designed.