Scientists: Gulf spill far bigger than Valdez

U.S. Geological Survey Director Dr. Marcia McNutt said the results are preliminary, but that two teams using different methods determined the well that exploded April 20 and sank two days later has spilled between 17 and 39 million gallons.
Earlier, more conservative estimates put the amount of crude oil at 7 million gallons.
The USGS estimates are bad news for President Barack Obama's administration and BP, which have taken a public relations beating as a result of the spill.
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