Telegraph: The phenomenon, which happens every two to seven years, occurs when the surface ocean waters of the Eastern Pacific are unusually warm. Officially known as the El Nino Southern Oscillation, it affects wind patterns around the world and can cause drought and heavy rains. The latest El Nino brings fears of drought in Australia and the prospect of floods in South America. Robert Stefanski, from the World Meteorological Organisation (WMO), warned that El Nino could disrupt …