@CNN: The weather phenomenon called El Niño largely became a part of the public vernacular more than 20 years ago. Here’s a look at what it is, and what causes it. https://t.co/jIjRJw1dUp https://t.co/jImC5rjhk7

@CNN: The weather phenomenon called El Niño largely became a part of the public vernacular more than 20 years ago. Here’s a look at what it is, and what causes it. https://t.co/jIjRJw1dUp https://t.co/jImC5rjhk7