Due to the efforts of numerous scientists, water filtration systems and stricter regulations on agricultural runoff, the annual average concentration of phosphorus is decreasing.
"The Everglades: Farms, Fuel and the Future of America's Wetland -- An E&E Special Report." E&E Publishing -- The Premier Information Source for Professionals Who Track Environmental and Energy Policy. Web. 30 Nov. 2011. <http://www.eenews.net/special_reports/everglades/next_frontier/>.
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