LiveScience: With the official numbers now in 2015 is, by a substantial margin, the new record-holder, the warmest year in recorded history for both the globe and the Northern Hemisphere. The title was sadly short-lived for previous record-holder 2014. And 2016 could be yet warmer if the current global warmth persists through the year. One might wonder: Just how likely is it to see such streaks of record-breaking temperatures if not for human-caused warming of the planet? Playing the odds? A year ago, several...