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globalchange

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carbon(16)
population(12)
nitrogen(10)
biomass(8)
forests(7)
organic carbon(7)
ph(7)
carbon dioxide(6)
conservation(6)
lead(6)
phosphorus(6)
precipitation(6)
grasslands(5)
humidity(5)
soils(5)
fertilizers(4)
lakes(4)
organic matter(4)
urban areas(4)
wetlands(4)
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