BP Shifts Plan Back To Capturing Oil, Not Stopping It
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Gulf Oil Spill Now the Biggest In U.S. History
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BP Hopes 'Top Kill' Will Stop Oil Gusher
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Workers construct a dam to keep oil from entering wetlands on Elmer's Island in Louisiana. Patrick Semansky/AP hide caption

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BP's Own Numbers Prove Spill Greater Than Estimate
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Scientist: BP's Oil Spill Estimates Improbable
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New Video Could Provide More Answers On Oil Spill
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Oil leaks into the Gulf of Mexico from the end of the pipe that was supposed to pump oil from the sea floor before the Deepwater Horizon oil rig exploded and sunk last month. BP PLC/AP hide caption

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Gulf Spill May Far Exceed Official Estimates
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The Difficulties Of Measuring The Oil Spill
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BP To Rely On 'Junk' To Stop Spewing Oil
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Key Events That Led To Deepwater Blowout
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Researcher Sydney Levitus' work frequently transports him -- at least figuratively -- back to the helms of ships that plied the seas many decades ago. iStockphoto.com hide caption

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Ship Logs Help Scientists Trace Oceans' Warming
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A boat with an oil boom tries to contain the spill, approximately seven miles from where the oil rig sunk last week. Gerald Herbert/AP hide caption

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BP Turns To Plan B: Capping The Well
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Examining A Climate Conundrum
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A satellite captured the erupting of the Okmok Caldera volcano on Umnak Island in Alaska in July 2008. The volcano spewed both steam and ash. NASA/AP hide caption

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Who Determines When Airways Are Safe From Ash?
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