COVINGTON, La. - An untested procedure to plug the blown-out oil well in the Gulf of Mexico seemed to be working, officials said Thursday, but new estimates showed the spill has already surpassed the Exxon Valdez as the worst in U.S. history.A team of scientists trying to determine how much oil has been flowing since the offshore rig Deepwater Horizon exploded April 20 and sank two days later found the rate was more than twice and possibly up to five times as high as previously thought. The fallout from the spill has stretched all the way to Washington, where the head of the federal agency...
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