" As a result, the distribution maps for plant species don't look the same from interglacial to interglacial. Each climate change creates a new map, with new communities of species living together. Whole suites of species do not pick up en masse and decorously tiptoe south, making sure to keep together. It is rather mad scramble - albeit in geological time.

Some of today's ecosystems have not fully bounced back from the last glaciation. One analysis suggested that thirty-six of fifty-five European tree species studied had still not spread out to the edges of their possible ranges. Beech trees are notoriously poky. In North-America they are still moving west across Michigan's Upper Peninsula. "

― , The Rambunctious Garden: Saving Nature in a Post-Wild World