Climate change at polar and sub-polar latitudes is amplified relative to the global mean. Paleoclimate and paleoenvironmental proxy reconstructions and model simulations for the higher latitudes are therefore necessary to validate and improve earth system models. The need for increased understanding of the potential magnitude, processes, and polar amplification of future climate change is particularly acute as anthropogenic increases in atmospheric CO₂ are now comparable to the mid-Pliocene warm period. We invite contributions that provide new insights into the paleoclimate and paleoenvironments of the high middle-latitudes and polar regions, from both oceanic and terrestrial proxy records and/or model simulations, during globally warm intervals from Late Cretaceous to pre-Quaternary periods. We are particularly interested in contributions that explore potential “slow” forcings at higher latitudes—such as paleogeographic forcings, vegetation and potential cryosphere feedbacks, and changes to oceanic circulation—that are not as well understood during globally warm intervals in deep time.