Hans Micklitz’s research group on the External Dimensions of European Private Law from the European University Institute Florence. Under the umbrella topic of ‘Private law external border for legal action on sustainability, the groups exchanged about ongoing research and discussed on a variety of issues surrounding the role of law in sustainability. Presentations were held by Prof. Hans Micklitz (EUI and UH), and doctoral candidates Rebecca Ravalli, Rodrigo Vallejo (EUI) and Martin Björklund (UH). We would like to thank all participants for the very interesting insights and discussions.