Solo: 2015 was Earth's hottest year on record, according to new data released Wednesday by NOAA and NASA. Globally averaged temperatures in 2015 shattered the 2014 record by 0.23 degrees Fahrenheit (0.13 Celsius). And it beat the previous 2014 record by roughly one quarter of a degree, the second-largest year-over-year margin.
2015 was the fourth time that a global temperature record had been set in the 21st century.
Once the El Nio cycle began to affect temperatures after mid-year, "October, November,...