Last year was the hottest year in recorded history, scientists said Wednesday.
Earth’s surface temperatures in 2015 were the warmest since record keeping began in 1880, according to the U.S. National Oceanic and Atmospheric Administration and NASA.
Scientists said that the planet’s average surface temperature has risen about 1.8 degrees Fahrenheit (1.0 degree Celsius) since the late 19th century, a change they largely attribute to the increased presence of carbon dioxide and other human-made emissions in the atmosphere.
Here’s what that looks like in 30 seconds:
Data on global temperatures comes from thousands of weather stations around the world. Most of the planet’s warming occurred in the last 35 years, according to NOAA and NASA. Fifteen of the 16 warmest years on record occurred since 2001.
Last year’s global temperatures broke the record set in 2014 by 0.23 degrees Fahrenheit (0.13 Celsius)—only the second time in modern history—the first being in 1998—that a new record was this much greater than the previous one. In December of last year, the average surface temperatures of land and oceans around the globe was the highest on record for any month in 136 years of record keeping, according to NOAA.