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There's a big difference between Valdez and the Gulf spill - distance. The Valdez went aground relatively close to shore, which meant that the majority of the oil got to shore. There's a significant amount of the Gulf oil evaporating and the distance allows it to spread out more. That means a greater area of shoreline is effected but in lesser concentrations.
Comparing the two spills is a bit of apples and oranges in terms of sheer logistics.
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