Reuters: The chances have increased over the past month that the much-feared El Nio phenomenon, which has the potential to wreak havoc on global crops, would strike by summer in the Northern Hemisphere, the federal US weather forecaster said Thursday. In its monthly report, the Climate Prediction Center, an agency of the National Weather Service, pegged the likelihood at more than 50%. In March, it said there was about a 50% chance of the weather pattern that causes floods and droughts across the world...