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.
Fire boat response crews battle the blazing remnants of the off shore oil rig Deepwater Horizon, off Louisiana, in this handout photograph taken on April 21, 2010 and obtained on April 22. The oil drilling rig that had burned for 36 hours in the Gulf of Mexico sank Thursday as hopes dimmed for 11 missing workers and the risk of a major oil spill loomed, officials said. Picture taken April 21, 2010. REUTERS/U.S. Coast Guard/Handout (UNITED STATES - Tags: DISASTER ENERGY) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS
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