UN warns: risk of record heat Get ready - the little guy is coming. The UN's call is about El Niño, a powerful weather phenomenon that can have devastating effects on... Text; Sofia Eriksson/TT Foto; Brontë Wittpenn/AP/TT Grafik; Johan Hallnäs/TT Climate and EnvironmentOther El NiñoLa Niñaheat recordwarming recordClimate change