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population(8)
lakes(5)
sediments(5)
biomass(4)
mortality(4)
aquifers(3)
conservation(3)
coral reefs(3)
emissions(3)
nitrogen(3)
precipitation(3)
surface water(3)
agriculture(2)
clouds(2)
contaminants(2)
density(2)
elements(2)
erosion(2)
fisheries(2)
forests(2)
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