"So there really are, one year out, more questions than there are answers," said Lisa Suatoni, a senior ocean scientist at the Natural Resources Defense Council. "We have a sense of where the oil went, but we don't have a sense of what volume went where. ... It still exists in the environment, either on the shore or at the bottom of the sea or floating around the ocean."
Oil spill still stains Gulf Coast's economy →
Ms. Suatoni said that figure likely is a gross understatement.
Oil spill still stains Gulf Coast's economy →
