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Pakistani youth cool themselves with water during a heat wave in Islamabad on June 21, 2015. At least 17 people have died as a heat wave has gripped the country, local media reported. AFP PHOTO / Farooq NAEEM (Photo credit should read FAROOQ NAEEM/AFP/Getty Images)
Pakistani youth cool themselves with water during a heat wave in Islamabad on June 21, 2015. At least 17 people have died as a heat wave has gripped the country, local media reported. AFP PHOTO / Farooq NAEEM (Photo credit should read FAROOQ NAEEM/AFP/Getty Images)

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    2015 was the warmest year since 1880

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2015 was the warmest year since 1880

2015 was the Earth's warmest year since record keeping began in 1880, the U.S. National Oceanic and Atmospheric Administration says.

2015 was the warmest year since 1880

2015 was the Earth's warmest year since record keeping began in 1880, the U.S. National Oceanic and Atmospheric Administration says.