phrodeau
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http://nationalgeographic.org/encyclopedia/swamp/
http://www.usouthal.edu/geography/fearn/480page/02Vernon/Vernon.htmIn the United States, filling or draining swamps was an accepted practice. Almost half of U.S. wetlands were destroyed before environmental protections were enacted during the 1970s. Most of the Everglades have been reclaimed as agricultural land, mostly sugar plantations. Draining swampland also created valuable real estate in the San Francisco Bay Area in California.
Federal and state authorities drained much of the wetlands at the delta of the Mississippi River in Louisiana as part of a massive system of river management. When Hurricane Katrina blew in from the Gulf of Mexico in 2005, the spongy swamp that traditionally protected the city of New Orleans from destructive weather patterns was diminished. The city was hit full force with a Category 3 hurricane.
Eradicating swampland also threatens economic activity. Two-thirds of the fish and shellfish that are commercially harvested worldwide are linked with wetlands. From Brazil's varzeas, or freshwater swamps surrounding the Amazon River, to saltwater swamps near the Florida Keys, commercially valuable fish species that depend on wetlands are threatened with extinction.
In the early 1970s, governments began enacting laws recognizing the enormous value of swamps and other wetlands. In some parts of the United States, it is now against the law to alter or destroy swamps. Through management plans and stricter laws, people are trying to protect remaining swamps and to re-create them in areas where they have been destroyed.
Wragg Swamp was drained in the mid 1950’s in order to make way for new development westward from the city of Mobile in Alabama. This swamp served as a sponge soaking up all the runoff from higher elevations to the extreme west of the area. The destruction of the swamp has been the cause of higher turbidity, pollution and degradation in local creeks and streams.