September 16, 2010 1:12 PM

Commentary: Gulf Oil spill's challenges are many

One day earlier this month a study revealed that the massive BP oil spill did not create the feared marine life "dead zones" deep beneath the surface of the Gulf of Mexico. Less than a week later, scientists reported crude now lies on the ocean floor at the one-mile depth, two inches thick atop dead shrimp and other small creatures.

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