First of a kind, the International Master on CO2 Geological Storage provides high level training to young professionals interested to underground geological storage, putting them in connection with the most qualified scientific community on the topic in Europe. The founding universities, Sapienza University of Rome and Zagreb University, are members of CO2GeoNet, the European Network of Excellence on the Geological Storage of CO2, which comprises 27 research institutes from 21 European countries http://www.co2geonet.com/home/. Together they have developed the programme for this master, building on many years of collaboration and joint research projects.