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globalchange

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carbon(12)
nitrogen(8)
forests(7)
loess(7)
vegetation(7)
erosion(6)
fertilizers(6)
humidity(6)
precipitation(6)
biomass(5)
organic carbon(4)
population(4)
urban areas(4)
carbon dioxide(3)
density(3)
drought(3)
lead(3)
organic matter(3)
oxygen(3)
rural areas(3)
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