U.S. oil price turns negative for first time in history

File photo taken on March 12, 2019 shows an operating oil pump in Luling of Texas, the United States. U.S. oil prices turned negative on April 20, 2020. West Texas Intermediate crude for May delivery shed more than 300 percent to settle at -37.63 U.S. dollars per barrel on the New York Mercantile Exchange. (Xinhua/Wang Ying)