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surface water(526)
lakes(234)
carbon(221)
salinity(169)
water quality(169)
population(163)
precipitation(125)
conservation(123)
oxygen(106)
oceans(101)
water management(100)
biomass(97)
nitrogen(97)
density(89)
carbon dioxide(81)
lead(81)
ph(77)
drought(74)
sediments(71)
wetlands(70)
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