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globalchange

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carbon(10)
methane(10)
carbon dioxide(5)
oxygen(4)
soils(4)
nitrogen(3)
absorption(2)
agricultural lands(2)
emissions(2)
forests(2)
lakes(2)
land surface(2)
organic carbon(2)
sediments(2)
soil respiration(2)
surface water(2)
tropospheric ozone(2)
wetlands(2)
atmosphere(1)
buildings(1)
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