The global weather phenomenon marks when the waters of the Pacific Ocean become much warmer than usual. After three years of cold La Niña weather, the US National Oceanic and Atmospheric Administration (NOAA) announced on Thursday that El Niño is now underway. “El Niño is commonly associated with record temperatures globally. Whether it will happen in 2023 or 2024 is not yet known, but I think it is more likely than not," says Carlo Buontempo, director of the EU's Copernicus programme. Climate Change Service. (Rebecca Ann Hughes)

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