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carbon(18)
population(10)
forests(9)
nitrogen(9)
precipitation(9)
conservation(8)
lakes(7)
surface water(7)
biomass(6)
fertilizers(6)
vegetation(6)
carbon dioxide(5)
emissions(5)
oxygen(5)
public health(5)
density(4)
erosion(4)
grasslands(4)
humidity(4)
organic carbon(4)
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