Islamist militants raided the In Amenas natural gas field (pictured) in Algeria on Wednesday and took several hostages. BP/AP hide caption

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July 2010: Two pelicans sit on booms protecting Queen Bess Island, La., from oil that spilled after the Deepwater Horizon rig exploded in April. Chris Graythen/Getty Images hide caption

itoggle caption Chris Graythen/Getty Images