After a magnitude-4.5 earthquake was recorded near Cushing in October, Oklahoma regulators ordered oil companies to shut down several disposal wells. That seemed to slow the shaking — at least for a while. Joe Wertz/StateImpact Oklahoma hide caption

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A member of the Syrian government forces stands next to a well at Jazel oil field, near the ancient city of Palmyra, after they retook the area from the Islamic State in March. U.S.-led airstrikes have targeted oil facilities run by ISIS, which, according to some estimates, earns as much as $1 million per day from oil sales. STR/AFP/Getty Images hide caption

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Hitting ISIS Where It Hurts By Striking Oil Trucks

Illicit oil sales generate large revenues every day for the Islamic State. The U.S. airstrikes could dry up a significant stream of cash for the group.

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The Shanghai-listed Yantai Xinchao Industry Co. filed a security filing over the weekend announcing it would purchase Texas oil properties for 8.3 billion yuan. AFP/AFP/Getty Images hide caption

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A coal-bed methane well sits abandoned in a pool of water outside Gillette, Wyo. It's more expensive than it looks to clean up. Stephanie Joyce/Wyoming Public Radio hide caption

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Ryan Peck repossesses vehicles in Corpus Christi, Texas. His business is seeing the upside of the downturn in oil prices: a spike in the number of expensive trucks bought by oilfield workers during an earlier boom. Mose Buchele/KUT hide caption

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Shoppers make their way in a Tehran bazaar. Once international sanctions are lifted, $100 billion from Iranian oil sales will be released from escrow accounts. Vahid Salemi/AP hide caption

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Oil trains sit idle on the BNSF Railway's tracks in Chicago's Pilsen neighborhood. David Schaper/NPR hide caption

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After completing training in 2013, Claire Kerstetter now works as a fluid technician on fracking jobs. Jeff Brady/NPR hide caption

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Oil pump jacks in Williston, N.D., in December. Oil prices have been on the rise, but some analysts say the global economic slowdown, fracking and the rise of alternative energy will mean less demand and lower prices. Eric Gay/AP hide caption

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Firefighters douse blazes after a freight train loaded with oil derailed in Lac-Mégantic in Canada's Quebec province on July 6, 2013, sparking explosions that engulfed about 30 buildings in fire. AFP/Getty Images hide caption

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A flag bearing the logo of Royal Dutch Shell flies outside the head office in The Hague, Netherlands. The energy company said Wednesday that it has agreed to buy gas producer BG Group for $70 billion. Peter Dejong/AP hide caption

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Iranian oil workers gather at an oil refinery south of the capital Tehran, Dec. 22, 2014. Iran's oil exports have been crippled by sanctions. Vahid Salemi/AP hide caption

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