Collapsing Marsh Dwarfs BP Oil Blowout as Ecological Disaster

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Claude Luke throttles down his 21-foot aluminum work boat. Off to the left, the snout of an alligator disappears near the mouth of a watery gash in the Louisiana marshland.

The 51-year-old Cajun crab fishermen is touring the epicenter of an unfolding environmental disaster that dwarfs the BP Plc spill and predates it by decades, according to state scientists and environmentalists. If unchecked, the destruction threatens to undermine the world’s seventh largest estuary and one of the most important U.S. energy corridors.