(FILES) This file photo taken on August 12, 2016 shows a woman as she shades herself from the sun with an umbrella as she walks on the National Mall during warm weather in Washington, DC. July marked the Earth's hottest month in modern times, setting a new record for planet-wide heat that has not been seen in 137 years of record-keeping, US government scientists said August 17, 2016."The globally averaged temperature over land and ocean surfaces for July 2016 was the highest for both the month of July and for any month in the NOAA global temperature dataset record, which dates back to 1880," said the National Oceanic and Atmospheric Administration. / AFP PHOTO / Brendan SmialowskiBRENDAN SMIALOWSKI/AFP/Getty Images