Arctic speleothems reveal nearly permafrost-free Northern Hemisphere in the Late Miocene - Vaks, Anton; Mason, Andrew; Breitenbach, Sebastian F.M.; Giesche, Alena Maria; Osinzev, Alexander; Adrian, Irina; Kononov, Aleksandr; Umbo, Stuart; Lechleitner, Franziska A.; Rosensaft, Marcelo; Henderson, Gideon M. (Nature Communications, 2025)