Greenpeace staff member Lindsey Allen takes a sample of water in a heavily oiled marsh near South Pass, Louisiana May 19, 2010. For nearly a month, roughly 5,000 barrels (210,000 gallons/795,000 liters) of oil per day have been gushing from BP's broken Deepwater oil well situated in the Gulf of Mexico, in what could be named the worst oil spill in U.S. history. [Xinhua/Reuters]
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