The Deepwater Horizon Oil Spill that occurred in the Gulf of Mexico in 2010 spilled 4.9 million barrels of oil into the Gulf, causing tremendous impacts to the ecosystem. The Exxon Valdez Oil Spill in the Prince William Sound in 1989 also had a tremendous impact on the environment. Impacts of these spills can still be seen, and there is still oil that has not yet been cleaned up on land and in the water. (Image courtesy of Pete Markham via Wikimedia Commons)
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