The US National Oceanic and Atmospheric Administration (NOAA) has declared that El Niño conditions are now under way in the tropical Pacific, with sea surface temperatures having risen sharply in recent months.
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El Niño - the natural Pacific weather pattern that pushes up global temperatures - has officially begun, US scientists say.
Many forecasts suggest this could end up as a so-called "super" El Niño, and even be among the strongest ever recorded.
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An El Niño event has officially started, say US scientists, raising fears of extreme weather and higher temperatures.
