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globalchange

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carbon(21)
population(20)
nitrogen(15)
forests(12)
surface water(12)
precipitation(9)
density(8)
lead(8)
urban areas(8)
vegetation(8)
conservation(7)
grasslands(7)
rural areas(7)
biomass(6)
carbon dioxide(6)
fertilizers(6)
humidity(6)
organic carbon(6)
oxygen(6)
emissions(5)
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