“If you think you've heard this story before, you haven't seen anything yet,” Gavin Schmidt, director of NASA’s Goddard Institute for Space Studies, said at the close of a decade plagued by raging wildfires, melting ice and extreme weather that researchers have repeatedly tied to human activity.
Schmidt said Earth as a whole is probably the hottest it has been during the Holocene — the past 11,500 years or so — meaning this could be the warmest period since the dawn of civilization.
The 2010s averaged 58.4 degrees Fahrenheit (14.7 degrees Celsius) worldwide, or 1.4 degrees (0.8 C) higher than the 20th century average and more than one-third of a degree (one-fifth of a degree C) warmer than the previous decade, which had been the hottest on record, according to the National Oceanic and Atmospheric Administration.