My general research interest is about understanding the processes controlling cold seep systems, in particular fluid- and gas circulation and emission into the hydrosphere and atmosphere. The current debate about methane contributing to the present climate change is field of my recent postdoctoral work. The transport processes of methane through gas bubbles emanating from deep-sea cold seeps have been in focus already during my PhD thesis. My ongoing research related to this topic enables to get an overview over these unique environments occurring in a variety of different geological settings and allows to assess their role in the global carbon cycle.