evidence: If you want to understand how interconnected our planet is—how patterns and events in one place can affect life half a world away—study El Niño. [...] Earth scientists, historians, and archaeologists have theorized that El Niño had a role in the demise or disruption of several ancient civilizations, including the Moche, the Inca, and other cultures in the Americas. But the recorded history of El Niño really starts in the 1500s, when European cultures reached the New World and met indigenous American cultures. [...] Fires raging in Indonesia. Fisheries collapsing off Peru. Delayed monsoon rains over India. Floods and mosquito-borne disease outbreaks in South America. Epic drought and mass migrations in southern Africa. Once an El Niño is declared, it seems every extreme weather-related event in the world is blamed on this phenomenon.