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Potomac River now healthier than in '50s, study shows
The Potomac River is cleaner now than it has been in decades, thanks largely to upgrades at Washington's sewage plant - and the proof is on the river bottom, where thickets of underwater grass are replacing mud and murk, according to a new scientific study.
BP releases report on gulf well blowout
BP released a long-awaited report Wednesday on an internal investigation into the causes of its Gulf of Mexico oil well blowout, blaming multiple failures by BP and other firms but absolving its much-criticized well design.
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