The RISCS project aims to provide guidance regarding potential impacts of an unlikely CO2 leak on a full range of the types of environments where CCS may occur throughout the EU region. For that reason the impact and safety of CO2 storage is being studied by conducting field studies in representative terrestrial environments. These include the artificial sites ASGARD (Artificial Soil Gassing and Response Detection) and Grimsrud in UK and Norway, respectively and the natural CO2 leaking sites of Florina field (Greece), Latera and San Vittorino (Italy) and Montmiral (France).