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carbon(39)
organic carbon(7)
carbon dioxide(6)
agriculture(5)
biomass(5)
forests(4)
nitrogen(4)
organic matter(4)
oxygen(4)
density(3)
iron(3)
ph(3)
precipitation(3)
soils(3)
altitude(2)
buildings(2)
carbonate(2)
elements(2)
geochemistry(2)
methane(2)
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