What Effect Has El Nino Had On Seals and Sea Lions? El Nino, also called the "El Nino-Southern Oscillation" or ENSO, is a change in the ocean-atmosphere system in the eastern Pacific that occurs about every five to seven years. It contributes to significant weather changes around the world, according to the National Oceanic and Atmospheric Administration. Among these changes are increased rainfall across the southern region of the U.S. and in Peru and …
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