The U.S. lost an average of 80,000 acres of coastal wetlands from 2004 to 2009, according to recent government data. In a recent period, more than 70 percent of the estimated loss came in the Gulf of Mexico.
Source: http://www.npr.org/blogs/thetwo-way/2013/11/22/246777657/rate-of-u-s-coastal-wetlands-losses-has-sped-up-study-says?ft=1&f=1003
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