The CO2CARE (CO2 Site Closure Assessment REsearch) project focused on site closure and preparation for transfer of liability of a CO2 storage project in order to assist regulatory authorities and stakeholders in implementing the EU Directive 2009/31/EC on CO2 Geological Storage. The project, which started in January 2011, was funded by the EU 7th Framework Programme and the industry and ran for a period of three years until December 2013. CO2CARE consisted of an international consortium of 23 partners from Europe, USA, Canada, Japan and Australia, represented by universities, research institutes, and energy companies. In order to incorporate up-to-date results and monitoring data 9 key injection sites in Europe and worldwide formed an integral part of the project: (1) Ketzin, Germany; (2) Sleipner, Norway; (3) K12-B, The Netherlands; (4) Rousse, France; (5) Montmiral, France; (6) Frio, USA; (7) Wallula, USA; (8) Nagaoka, Japan and (9) Otway, Australia. Project website: http://www.co2care.org/