A Pleurosigma, a type of phytoplankton in the ocean. Phytoplankton generate more than half of the Earth's oxygen. Harry Taylor/Nikon Small World hide caption

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Harry Taylor/Nikon Small World

The Food Chain's Weak Link: Tiny Ocean Plants Dying

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BP Nears Permanent Fix For Leaking Oil Well

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New Cap Stops BP Gulf Oil Leak

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BP Faces More Test Delays On Well Cap

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BP Delays Critical Tests On New Well Cap

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BP Waits To See If New Cap Provides Tighter Seal

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Weather Delays BP's Plan To Collect More Oil

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Oil Predicted To Hit Florida's Atlantic Coast, Not Gulf

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'Alex' Could Slow BP's Plan To Capture More Oil

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The looming storm could postpone BP's plans to double the amount of oil they capture from the spill. Here, a boat uses a boom and absorbent material to soak up oil on the surface of the water near Grand Isle, La., on Monday. Joe Raedle/Getty Images hide caption

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Stormy Weather Could Delay Oil Spill Cleanup Efforts

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The chief government spokesperson on the oil spill, Coast Guard Adm. Thad Allen, often speaks with great authority. Trouble is, he's bungled a lot of the facts. Chip Somodevilla/Getty Images hide caption

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Facts Garbled As U.S. Tries To Take Charge Of Spill

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Gulf Oil Spill Estimate Revised Again

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New Oil Estimates Show Spill Rate Much Higher

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Cap 'Encouraging Step'; BP To Expand System

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BP Hopes Cap Will Keep Oil From Escaping

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