Washington Post: The bars in red on the graph below are the 20 hottest years on human record. There were hotter years, like when the Earth was still mostly molten rock. But since mankind has had the capability to actually measure temperatures around the world, the 20 bars below indicate the hottest years we've seen.
(Those temperatures are in Celsius and are relative to the average land and sea temperature over the course of the 20th century.)
You may notice a pattern. Of those 20 years, 15 have been since...