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globalchange

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soils(5)
carbon(3)
nitrogen(3)
oxygen(3)
agricultural lands(2)
atmosphere(2)
biomass(2)
freeze/thaw(2)
methane(2)
ph(2)
soil moisture(2)
absorption(1)
ammonia(1)
carbon dioxide(1)
clouds(1)
forests(1)
frozen ground(1)
grasslands(1)
islands(1)
land surface(1)
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