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population(31)
conservation(22)
carbon(16)
forests(13)
lakes(13)
density(12)
biomass(10)
emissions(10)
lead(10)
surface water(10)
agriculture(9)
landscape(9)
nitrogen(8)
precipitation(8)
salinity(8)
boundaries(7)
mortality(7)
chlorophyll(6)
coral reefs(6)
drought(6)
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