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There does seem to be some public consensus on the Lake Greenwood algae problem : The excessive algal growth on Lake Greenwood is attributable to heavy nutrient loading to the upper lake segment and its upstream tributaries , primarily from anthropogenic sources of nitrogen and phosphorous . In addition , FDA has reviewed the report of the Commission , which was established by the DSHEA to provide guidance and recommendations for the regulation of label claims and statements for dietary supplements . In particular , this variety of algae is thought to flourish in water with high levels of nitrogen compounds common in treated sewerage . With millions of online records built from the bibliographic and ownership information of contributing libraries , it is the largest and most comprehensive database of its kind ( 58 million quality records and counting ) . It produces thousands of tons of marijuana , more than seven mt of heroin , and an unknown quantity of methamphetamine yearly . Other studies using the variations in the isotopic composition of nitrogen have had unexpected results that are difficult to interpret ( Bohlke et al ., 1992 ) or have methodologies that are difficult to use ( Kreitler , 1975 ) . Information on the sources of nitrogen and phosphorous loading to the lake and its upstream tributaries has not been reported in any comprehensive way . Publication - " Publication " is the distribution of copies or phonorecords of a work to the public by sale or other transfer of ownership , or by rental , lease , or lending .