The Late Glacial Maximum (c. 13,000-10,000 years ago), or Tardiglacial ("Late Glacial"), is defined primarily by the beginning of the modern warm period, in which climates in the Northern Hemisphere warmed substantially, causing a process of accelerated deglaciation following the Last Glacial Maximum (c. 25,000-13,000 years ago). At this time, human populations, previously forced into refuge areas as a result of Last Glacial Maximum climatic conditions, gradually begin to repopulate the Northern Hemisphere's Eurasian landmass and eventually populate North America via Beringia for the first time.