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surface water(502)
lakes(151)
population(58)
carbon(56)
wetlands(55)
water quality(45)
conservation(43)
salinity(42)
nitrogen(39)
biomass(36)
oxygen(36)
forests(26)
lead(26)
nutrients(24)
organic carbon(24)
precipitation(24)
vegetation(24)
density(23)
landscape(23)
chlorophyll(22)
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