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population(7)
carbon(6)
nitrogen(4)
phosphorus(4)
sediments(4)
surface water(4)
density(3)
forests(3)
lakes(3)
organic carbon(3)
urban areas(3)
aquaculture(2)
carbon dioxide(2)
conservation(2)
hydrocarbons(2)
nutrients(2)
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particulates(2)
public health(2)
suspended solids(2)
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