The past decade was the hottest ever recorded on the planet, driven by an acceleration of temperature increases in the past five years, according to data released Wednesday.
The findings, released jointly by NASA and the National Oceanic and Atmospheric Administration, detail a troubling trajectory: 2019 was the second-hottest year on record, trailing only 2016. The past five years each rank among the five hottest since record-keeping began. And 19 of the hottest 20 years have occurred during the past two decades.
The warming trend also bears the unmistakable sign of human activity, which emits tens of billions of tons of carbon dioxide into the atmosphere each year, scientists say.
“No individual hot year — or hot day or hot season, for that matter — is by itself evidence for climate change. But this hot year is just one of many hot years in this decade,” said Kate Marvel, a research scientist at NASA and Columbia University. “The planet is statistically, detectably warmer than before the Industrial Revolution. We know why. We know what it means. And we can do something about it.”