An interglacial climate shift occurs during El Nino/Southern Oscillation. A single climatic phenomena known as the El Nino-Southern Oscillation alternates sporadically between three states: neutral, la Nina, and EL Nino.
In Europe And north America, there were multiple glacials over the 2.5 hundreds of millions of years of the Paleolithic, or large expansions of ice sheets and glaciers, which happened at intervals of around 40,000 to 100 million years. There were more moderate, shorter interglacial periods in between the lengthy glacial eras. The climate warms during interglacial, like the one we are currently experiencing, and the tundra retreats poleward alongside the ice sheets. Areas that formerly supported tundra vegetation now have forests. Paleontology helps determine if an interglacial occurred on landmass or in deep improved international seas.
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