Approximately in the middle of the 1970s Has definition a lot of yo and lani end decade 1990? Dozens of definition of a simple or more complex until yo lani appear in articles and books in general science.
By the mid-1970s A definition of El Niño, and the late 1990s. Dozens definition of El Niño from simple. To complex appeared in articles and books on science in general.
About the middle decades 1970. There are many definitions about El Nino and about the end of the decade 1990. Dozens of definition of El Nino since easily. Until the complex appeared in books and articles on Science in general.