Building upon on-going large, integrated projects (THRESHOLDS and DAMOCLES FP6 IPs, and the ARCTOS network) the project Arctic Tipping Points (ATP) aimed at identifying the elements of the Arctic marine ecosystem likely to show abrupt changes in response to climate change, and establish the levels of the corresponding climate drivers inducing regime shift in those tipping elements. In addition, state-of-the-art oceanographic, ecological, fisheries, and economic models was used to determine the effect of crossing those thresholds for the Arctic marine ecosystems, and the associated risks and opportunities for economic activities dependent on the marine ecosystem of the European Arctic.