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globalchange

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carbon(48)
precipitation(36)
population(34)
nitrogen(26)
biomass(21)
vegetation(20)
emissions(19)
density(18)
forests(18)
humidity(17)
surface water(16)
carbon dioxide(15)
lakes(14)
organic carbon(14)
oxygen(14)
lead(12)
petroleum(12)
ph(12)
sediments(12)
fertilizers(11)
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