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population(16)
carbon(14)
nitrogen(8)
biomass(7)
carbon dioxide(7)
precipitation(7)
density(6)
forests(5)
ph(5)
surface water(5)
conservation(4)
fertilizers(4)
lead(4)
organic carbon(4)
phosphorus(4)
vegetation(4)
grasslands(3)
heat(3)
humidity(3)
lakes(3)
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