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eutrophication(117)
lakes(43)
nitrogen(30)
phosphorus(23)
carbon(20)
nutrients(17)
sediments(15)
biomass(12)
surface water(11)
oxygen(9)
organic carbon(8)
organic matter(8)
population(8)
water quality(8)
wetlands(8)
emissions(7)
agriculture(6)
carbon dioxide(6)
chlorophyll(6)
coral reefs(6)
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