The Gulf Coast spill will have eclipsed the Exxon Valdez in terms of total gallons of oil before the weekend is over -- making it the largest oil spill in U.S. history -- according to calculations made by oceanographer Ian MacDonald after studying aerial Coast Guard photos taken earlier in the week. MacDonald, a professor at Florida State University who counts "oil and gas development" among his areas of expertise, stopped short of comparing the Deepwater Horizon spill to that of the Alaskan oil tanker, but said Saturday, "The spill is growing. I'm comfortable saying that the size and extent of this slick is 10 million gallons."
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