The Arctic region is warming at a rate two to three times higher than the global rate. Most strikingly, this becomes evident by the expansion of the warm Atlantic Water (so-called Atlantification) into the Arctic Ocean. The process further causes severe reductions in sea-ice coverage and a decrease in winter sea-ice thickness. These processes lead to increased open-water areas and further the oceanic uptake of atmospheric heat, which can lead to ice-free Arctic conditions by the end of this century. In recent years, Atlantification was observed also near the coast of Greenland, where warm Atlantic water mixes with the East Greenland Current. Despite the fact that the heat fluxes, caused by the inflow of Atlantic Water, threaten to destabilise the Greenland Ice Sheet there is a lack of long-term information regarding ocean variability at the Greenland shelf. Therefore, the main ambition of this project is to reconstruct the changes in the strength of the East Greenland Current and the behaviour of the Eastern Greenland ice sheet throughout the last 150 000 years. The project emphasises the Eemian period (~130 000–115 000 BP). Due to the higher than today temperature, the Eemian is considered a past analogue for future climatic warming. REHEAT integrates a traditional palaeoceanographic approach, such as analyses of foraminiferal species and measuring oxygen and carbon stable isotopes recorded in their shells and state-of-the-art analysis of sedimentary DNA (sedaDNA). This will allow us to create a coherent baseline of information on the variability of the East Greenland Current and the Eastern Greenland ice sheet in response to climate warming. This information can provide a further basis for evaluating ocean and ice sheet models, as well as insights into potential shifts in ocean ecosystems.