With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Afghanistan is in debt.
text_B: Nutrient pollution , a form of water pollution , refers to contamination by excessive inputs of nutrients .. water pollution. water pollution. It is a primary cause of eutrophication of surface waters , in which excess nutrients , usually nitrogen or phosphorus , stimulate algal growth .. nitrogen. nitrogen. phosphorus. phosphorus. algal. algae. eutrophication. eutrophication. Sources of nutrient pollution include surface runoff from farm fields and pastures , discharges from septic tanks and feedlots , and emissions from combustion .. surface runoff. surface runoff. emissions. air pollution. Excess nutrients have been summarized as potentially leading to  :. Population effects  : excess growth of algae -LRB- blooms -RRB- ;. Community effects  : species composition shifts -LRB- dominant taxa -RRB- ;. Ecological effects  : food web changes , light limitation ;. Biogeochemical effects  : excess organic carbon -LRB- eutrophication -RRB- ; dissolved oxygen deficits -LRB- environmental hypoxia -RRB- ; toxin production ;. eutrophication. eutrophication. environmental hypoxia. hypoxia ( environmental ). Human health effects  : excess nitrate in drinking water -LRB- blue baby syndrome -RRB- ; disinfection by-products in drinking water .. blue baby syndrome. blue baby syndrome. In a 2011 United States Environmental Protection Agency report , the agency 's Science Advisory Board succinctly stated  : `` Excess reactive nitrogen compounds in the environment are associated with many large-scale environmental concerns , including eutrophication of surface waters , toxic algae blooms , hypoxia , acid rain , nitrogen saturation in forests , and global warming . ''. nitrogen. nitrogen. eutrophication. eutrophication. United States Environmental Protection Agency. United States Environmental Protection Agency
not_related.