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globalchange

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grasslands(12)
carbon(9)
emissions(7)
vegetation(6)
agriculture(5)
biomass(5)
carbon dioxide(5)
lead(5)
nitrogen(5)
conservation(4)
precipitation(4)
deforestation(3)
forests(3)
biogeochemical cycles(2)
elements(2)
organic carbon(2)
phosphorus(2)
population(2)
savannas(2)
transportation(2)
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