A man wearing a mask is seen in smog during a polluted day in Harbin, Heilongjiang province, China, December 19, 2016. REUTERS/Stringer ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. CHINA OUT.
An Adelie penguin arrives at the New Harbor research station near McMurdo Station in Antarctica on November 11, 2016.Secretary of State John Kerry is travelling to Antarctica, New Zealand, Oman, the United Arab Emirates, Morocco and will attend the APEC summit in Peru later in the month. / AFP PHOTO / AFP POOL / MARK RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)