New Scientist: Extreme El Nio events, that can kill tens of thousands of people, will be twice as common this century because of climate change. The finding adds to the evidence that global warming will cause ever more extreme weather. The El Nio Southern Oscillation (ENSO) is one of the most powerful phenomena controlling global weather. An El Nio happens when warm water spreads across the surface of the Pacific, pushing rainfall to the east and causing floods in the Americas and drought in Australia. An El...