2017 was the second warmest year ever recorded — behind only 2016
2017 was the second warmest year on record, just ahead of 2015 and behind 2016, according to NASA.
The five hottest years on record have all occurred since 2010.
The warming is directly attributable to human-caused greenhouse gases like carbon dioxide.
Last year was the second warmest year on record since 1880, second only to 2016, NASA scientists said on Thursday.
The global average temperature for 2017 was 1.62 degrees Fahrenheit higher than the average temperature from 1951 through 1980,...