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surface water(503)
lakes(206)
carbon(146)
salinity(142)
population(140)
water quality(120)
conservation(104)
biomass(90)
oceans(88)
oxygen(87)
nitrogen(81)
density(69)
wetlands(66)
coral reefs(65)
chlorophyll(60)
ph(60)
carbon dioxide(59)
estuaries(53)
lead(52)
sediments(52)
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