Editing Oyashio Current (section)

==History==
During [[glacial period]]s, when lower [[sea level]] exposed the [[Bering land bridge]], the current could not flow in the regions the Oyashio affects today. The level of cooling with the onset of glacial conditions (after an [[interglacial]]) was much less than in other areas of the Earth at similar latitudes. This allowed [[Tōhoku Region|Tōhoku]] and [[Hokkaidō]] – the only areas of [[East Asia]] with enough snowfall to potentially form glaciers – to remain unglaciated except at high elevations during periods when Europe and [[North America]] were largely glaciated. This lack of glaciation explains why, despite its present climate being much colder than most of [[Europe]], East Asia has retained 96 percent of [[Pliocene]] tree genera, whereas Europe has retained only 27%.{{citation needed|date=August 2017}}