Exxon Valdez oil spill workers use pressure washers to wash oil from the beach at Smith Island on Alaska's Prince William Sound.
Benjamin Lowy / Corbis
Exxon gas station in Houston, TX.
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An Exxon Mobil Corp. gas station on Jan. 16, 2015.
Natalie Fobes / Science Faction / Corbis
The supertanker Exxon Valdez lies hard around Bligh Reef in Prince William Sound, Alaska, USA.
Paul Fusco / Magnum
The cleanup of Price William Sound after the Exxon-Valdez oil spill in 1989.
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An oil skimming operation near the southwest end of Prince William Sound in April 1989 in Valdez, a week after the beginning of an oil disaster which occurred when the tanker Exxon Valdez ran aground on March 24, 1989
Don Ryan, file / AP
A customer holds a gas pump handle at an Exxon station in Vancouver, Wash.
Scott Olson / Getty Images and Karen Bleir / AFP / Getty
A "For Sale" sign in front of a Chicago, Illinois house on May 31, 2011, and an Exxon gas station near the Watergate complex in Washington, DC on April 20, 2011.
Brian Harkin / Getty
ExxonMobil chairman Rex Tillerson speaks after the company's annual shareholders' meeting on Thursday in Dallas.
Haraz N. Ghanbari / AP
From left, ExxonMobil chairman and CEO Rex Tillerson, Chevron chairman and CEO John Watson, ConocoPhillips CEO James Mulva, Shell Oil president Marvin Odum and BP America chairman and president Lamar McKay testify on Capitol Hill in Washington on Tuesday, June 15, 2010
Julie Jacobson / AP
An oil-spill worker takes part in a cleanup along the Yellowstone River near Laurel, Mont., on July 11, 2011, after an ExxonMobil pipeline beneath the riverbed ruptured days earlier