AFTER HURRICANE BETSY pummelled New Orleans in 1965, causing damage so severe that "Betsy" was retired from the rotating list of names given to Atlantic hurricanes, the Governor of Louisiana, John McKeithen, pledged that nothing like it would happen in his state again. Exactly 40 years later Hurricane Katrina brought even greater destruction to the city, and hazard planners were deemed to have ignored the lessons of the past. New research suggests that far from being an exception, Louisiana's forgetfulness is the rule.
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