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globalchange

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agriculture(111)
carbon(76)
conservation(52)
forests(52)
soils(49)
irrigation(46)
fertilizers(45)
erosion(38)
organic carbon(38)
nitrogen(35)
population(34)
surface water(33)
vegetation(31)
landscape(30)
grasslands(28)
biomass(27)
density(27)
organic matter(26)
loess(24)
wetlands(22)
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