Gulf oil spill’s impact debated one year later

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After dominating the news for months, the Gulf oil spill is off the front page, but there's still oil out there.

The 86-day Deepwater Horizon gusher sent an estimated 200 million gallons of oil, tens of millions of gallons of natural gas and 1.8 million gallons of chemical dispersants into the northern Gulf of Mexico. And the fate of much of it remains murky, according to the Washington Post.

"There's still an awful lot of oil unaccounted for in the environment," said Ian R. McDonald, an oceanographer at Florida State University who has worked extensively in the Gulf.

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