There is mounting evidence for the non-analogue nature of Late Glacial ecosystems. This period also witnessed several dispersal episodes of human forager groups moving, for the first time, into previously uninhabitable glacial or periglacial landscapes. In palaearctic northern Europe, these dispersals are associated with a succession of archaeological technocomplexes that are traditionally thought to reflect changing adaptation strategies synchronised with contemporaneous environmental changes. Recent investigations into ecological disequilibrium dynamics suggest, however, that there may be a greater degree of mismatch between organisms and their environments, especially in arctic-type environments and during times of rapidly changing climate. We link these climatic changes to cultural changes via demographic inference. Based on recent dating evidence, environmental analyses and preliminary 2 morphometric and technological analyses of lithic material, we here develop the argument that these Late Glacial Palearctic foragers were similarly at disequilibrium and that coupled with their very low population densities were prone to regional extinction episodes. We focus in particular on the so-called 'Hamburgian culture' and its potentially failed dispersal into southern Scandinavia.