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globalchange

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carbon(4015)
carbon dioxide(1198)
emissions(984)
organic carbon(562)
soils(467)
nitrogen(454)
atmosphere(409)
forests(389)
lead(358)
carbonate(344)
biomass(335)
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precipitation(307)
heat(291)
petroleum(287)
conservation(257)
methane(252)
isotopes(227)
sustainability(220)
oxygen(212)
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