Reuters: Research showing an El Nino event in 1918 was far stronger than previously thought is challenging the notion climate change is making El Nino episodes more intense, a U.S. scientist said on Tuesday. El Nino causes global climate chaos such as droughts and floods. The events of 1982/83 and 1997/98 were the strongest of the 20th Century, causing loss of life and economic havoc through lost crops and damage to infrastructure. But Ben Giese of Texas A&M University said complex …