WASHINGTON (Reuters) – The world is enduring the hottest year on record, according to a U.S. national weather analysis, causing droughts worldwide and a concern for U.S. farmers counting on another bumper year. For the first six months of the year, 2010 has been warmer than the first half of 1998, the previous record holder, by 0.03 degree Fahrenheit, said Jay Lawrimore, chief of climate analysis at the federal National Climatic Data Center. Period of a El Nino weather pattern is being blamed for the hot temperatures globally. "We had an El Nino episode in the early part of the...