The drought that caused the rapid decline has been linked to El Niño, a climate phenomenon that occurs every two to seven years and changes worldwide weather patterns.

导致的水位的急剧下降的干旱已经和厄尔尼诺现象联系起来，这种气候现象每两到七年会出现一次并改变世界范围内的天气形势。

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The worry is that a rapid rise in temperatures would lead to climate changes that could be devastating for many (though not all) parts of the world.

ECONOMIST: Blowing hot and cold