This time last year the world’s weather was being dominated by one of the strongest El Niño events on record. As surface waters in the equatorial Eastern Pacific warmed by more than 2°C, a chain reaction of extreme weather events was set in motion. From torrential rains in Peru and huge storms pounding the coast of California, to drought and bushfire in Australia and Indonesia and catastrophic floods in south-east India (submerging parts of Chennai under eight metres of water), this El Niño really packed some punch.