A gas flare burns at the Yuzhno Russkoye oil and gas field, some 200 km (124 miles) from the town of Novy Urengoy, December 18, 2007. Russia's ambitious targets set by President Vladimir Putin last spring to cease gas flaring by 2011 is on track, companies say, but the government casts doubt. Picture taken December 18, 2007. REUTERS/Denis Sinyakov (RUSSIA)
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.
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