LiveScience: It's official: 2013 was one of the hottest years on record for the planet, tying 2003 as the world's fourth warmest year since record keeping began in 1880, a new analysis shows. Related Stories 2013 another unusually warm year across globe, US says AFP NOAA: World in 2013 was 4th hottest on record Associated Press Australia endures hottest year on record AFP Extreme El Nios Could Hit Twice As Often LiveScience.com [$$] It Isn't Climate Change The Wall Street Journal In 2013,...