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carbon(16)
nitrogen(15)
population(15)
vegetation(13)
precipitation(12)
forests(10)
density(9)
lakes(9)
sediments(9)
surface water(9)
biomass(8)
conservation(7)
emissions(7)
grasslands(7)
humidity(7)
lead(7)
organic carbon(7)
heat(6)
phosphorus(6)
aerosols(5)
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